PHP+yaml 示例

yaml概念：

YAML是“另一种标记语言”的外语缩写；但为了强调这种语言以数据做为中心，而不是以置标语言为重点，而用返璞词重新命名。它是一种直观的能够被电脑识别的数据序列化格式，是一个可读性高并且容易被人类阅读，容易和脚本语言交互，用来表达资料序列的编程语言。它是类似于标准通用标记语言的子集XML的数据描述语言，语法比XML简单很多。

适用场景

脚本语言
由于实现简单，解析成本很低，YAML特别适合在脚本语言中使用。列一下现有的语言实现：Ruby，Java，Perl，Python，PHP，OCaml，JavaScript，除了Java，其他都是脚本语言。

序列化
YAML比较适合做序列化。因为它是宿主语言数据类型直转的。

配置文件
YAML做配置文件也不错。写YAML要比写XML快得多(无需关注标签或引号)，并且比ini文档功能更强。
比如Ruby on Rails的配置就选用的YAML。对ROR而言，这很自然，也很省事.
由于兼容性问题，不同语言间的数据流转建议不要用YAML.

第一步：

spyc.php:（特别注意：这个是扩展文件，不要动里面任何代码，复制拷贝过去引用它就可以了。）

<?php/**   * Spyc -- A Simple PHP YAML Class   * @version 0.4.5   * @author Vlad Andersen <[e-mail]>   * @author Chris Wanstrath <[e-mail]>   * @link http://code.google.com/p/spyc/   * @copyright Copyright 2005-2006 Chris Wanstrath, 2006-2009 Vlad Andersen   * @license http://www.opensource.org/licenses/mit-license.php MIT License   * @package Spyc   */if (!function_exists('spyc_load')) {  /**   * Parses YAML to array.   * @param string $string YAML string.   * @return array   */  function spyc_load ($string) {    return Spyc::YAMLLoadString($string);  }}if (!function_exists('spyc_load_file')) {  /**   * Parses YAML to array.   * @param string $file Path to YAML file.   * @return array   */  function spyc_load_file ($file) {    return Spyc::YAMLLoad($file);  }}/**   * The Simple PHP YAML Class.   *   * This class can be used to read a YAML file and convert its contents   * into a PHP array. It currently supports a very limited subsection of   * the YAML spec.   *   * Usage:   * <code>   * $Spyc = new Spyc;   * $array = $Spyc->load($file);   * </code>   * or:   * <code>   * $array = Spyc::YAMLLoad($file);   * </code>   * or:   * <code>   * $array = spyc_load_file($file);   * </code>   * @package Spyc   */class Spyc {  // SETTINGS  /**   * Setting this to true will force YAMLDump to enclose any string value in   * quotes. False by default.   *   * @var bool   */  public $setting_dump_force_quotes = false;  /**   * Setting this to true will forse YAMLLoad to use syck_load function when   * possible. False by default.   * @var bool   */  public $setting_use_syck_is_possible = false;  /**#@+  * @access private  * @var mixed  */  private $_dumpIndent;  private $_dumpWordWrap;  private $_containsGroupAnchor = false;  private $_containsGroupAlias = false;  private $path;  private $result;  private $LiteralPlaceHolder = '___YAML_Literal_Block___';  private $SavedGroups = array();  private $indent;  /**   * Path modifier that should be applied after adding current element.   * @var array   */  private $delayedPath = array();  /**#@+  * @access public  * @var mixed  */  public $_nodeId;/** * Load a valid YAML string to Spyc. * @param string $input * @return array */  public function load ($input) {    return $this->__loadString($input);  } /** * Load a valid YAML file to Spyc. * @param string $file * @return array */  public function loadFile ($file) {    return $this->__load($file);  }  /**     * Load YAML into a PHP array statically     *     * The load method, when supplied with a YAML stream (string or file),     * will do its best to convert YAML in a file into a PHP array. Pretty     * simple.     * Usage:     * <code>     * $array = Spyc::YAMLLoad('lucky.yaml');     * print_r($array);     * </code>     * @access public     * @return array     * @param string $input Path of YAML file or string containing YAML     */  public static function YAMLLoad($input) {    $Spyc = new Spyc;    return $Spyc->__load($input);  }  /**     * Load a string of YAML into a PHP array statically     *     * The load method, when supplied with a YAML string, will do its best     * to convert YAML in a string into a PHP array. Pretty simple.     *     * Note: use this function if you don't want files from the file system     * loaded and processed as YAML. This is of interest to people concerned     * about security whose input is from a string.     *     * Usage:     * <code>     * $array = Spyc::YAMLLoadString("---\n0: hello world\n");     * print_r($array);     * </code>     * @access public     * @return array     * @param string $input String containing YAML     */  public static function YAMLLoadString($input) {    $Spyc = new Spyc;    return $Spyc->__loadString($input);  }  /**     * Dump YAML from PHP array statically     *     * The dump method, when supplied with an array, will do its best     * to convert the array into friendly YAML. Pretty simple. Feel free to     * save the returned string as nothing.yaml and pass it around.     *     * Oh, and you can decide how big the indent is and what the wordwrap     * for folding is. Pretty cool -- just pass in 'false' for either if     * you want to use the default.     *     * Indent's default is 2 spaces, wordwrap's default is 40 characters. And     * you can turn off wordwrap by passing in 0.     *     * @access public     * @return string     * @param array $array PHP array     * @param int $indent Pass in false to use the default, which is 2     * @param int $wordwrap Pass in 0 for no wordwrap, false for default (40)     */  public static function YAMLDump($array,$indent = false,$wordwrap = false) {    $spyc = new Spyc;    return $spyc->dump($array,$indent,$wordwrap);  }  /**     * Dump PHP array to YAML     *     * The dump method, when supplied with an array, will do its best     * to convert the array into friendly YAML. Pretty simple. Feel free to     * save the returned string as tasteful.yaml and pass it around.     *     * Oh, and you can decide how big the indent is and what the wordwrap     * for folding is. Pretty cool -- just pass in 'false' for either if     * you want to use the default.     *     * Indent's default is 2 spaces, wordwrap's default is 40 characters. And     * you can turn off wordwrap by passing in 0.     *     * @access public     * @return string     * @param array $array PHP array     * @param int $indent Pass in false to use the default, which is 2     * @param int $wordwrap Pass in 0 for no wordwrap, false for default (40)     */  public function dump($array,$indent = false,$wordwrap = false) {    // Dumps to some very clean YAML. We'll have to add some more features    // and options soon. And better support for folding.    // New features and options.    if ($indent === false or !is_numeric($indent)) {      $this->_dumpIndent = 2;    } else {      $this->_dumpIndent = $indent;    }    if ($wordwrap === false or !is_numeric($wordwrap)) {      $this->_dumpWordWrap = 40;    } else {      $this->_dumpWordWrap = $wordwrap;    }    // New YAML document    $string = "---\n";    // Start at the base of the array and move through it.    if ($array) {      $array = (array)$array;      $previous_key = -1;      foreach ($array as $key => $value) {        if (!isset($first_key)) $first_key = $key;        $string .= $this->_yamlize($key,$value,0,$previous_key, $first_key, $array);        $previous_key = $key;      }    }    return $string;  }  /**     * Attempts to convert a key / value array item to YAML     * @access private     * @return string     * @param $key The name of the key     * @param $value The value of the item     * @param $indent The indent of the current node     */  private function _yamlize($key,$value,$indent, $previous_key = -1, $first_key = 0, $source_array = null) {    if (is_array($value)) {      if (empty ($value))        return $this->_dumpNode($key, array(), $indent, $previous_key, $first_key, $source_array);      // It has children. What to do?      // Make it the right kind of item      $string = $this->_dumpNode($key, NULL, $indent, $previous_key, $first_key, $source_array);      // Add the indent      $indent += $this->_dumpIndent;      // Yamlize the array      $string .= $this->_yamlizeArray($value,$indent);    } elseif (!is_array($value)) {      // It doesn't have children. Yip.      $string = $this->_dumpNode($key, $value, $indent, $previous_key, $first_key, $source_array);    }    return $string;  }  /**     * Attempts to convert an array to YAML     * @access private     * @return string     * @param $array The array you want to convert     * @param $indent The indent of the current level     */  private function _yamlizeArray($array,$indent) {    if (is_array($array)) {      $string = '';      $previous_key = -1;      foreach ($array as $key => $value) {        if (!isset($first_key)) $first_key = $key;        $string .= $this->_yamlize($key, $value, $indent, $previous_key, $first_key, $array);        $previous_key = $key;      }      return $string;    } else {      return false;    }  }  /**     * Returns YAML from a key and a value     * @access private     * @return string     * @param $key The name of the key     * @param $value The value of the item     * @param $indent The indent of the current node     */  private function _dumpNode($key, $value, $indent, $previous_key = -1, $first_key = 0, $source_array = null) {    // do some folding here, for blocks    if (is_string ($value) && ((strpos($value,"\n") !== false || strpos($value,": ") !== false || strpos($value,"- ") !== false ||      strpos($value,"*") !== false || strpos($value,"#") !== false || strpos($value,"<") !== false || strpos($value,">") !== false || strpos ($value, ' ') !== false ||      strpos($value,"[") !== false || strpos($value,"]") !== false || strpos($value,"{") !== false || strpos($value,"}") !== false) || strpos($value,"&") !== false || strpos($value, "'") !== false || strpos($value, "!") === 0 ||      substr ($value, -1, 1) == ':')    ) {      $value = $this->_doLiteralBlock($value,$indent);    } else {      $value = $this->_doFolding($value,$indent);    }    if ($value === array()) $value = '[ ]';    if (in_array ($value, array ('true', 'TRUE', 'false', 'FALSE', 'y', 'Y', 'n', 'N', 'null', 'NULL'), true)) {       $value = $this->_doLiteralBlock($value,$indent);    }    if (trim ($value) != $value)       $value = $this->_doLiteralBlock($value,$indent);    if (is_bool($value)) {       $value = ($value) ? "true" : "false";    }    $spaces = str_repeat(' ',$indent);    //if (is_int($key) && $key - 1 == $previous_key && $first_key===0) {    if (is_array ($source_array) && array_keys($source_array) === range(0, count($source_array) - 1)) {      // It's a sequence      $string = $spaces.'- '.$value."\n";    } else {      // if ($first_key===0) throw new Exception('Keys are all screwy. The first one was zero, now it\'s "'. $key .'"');      // It's mapped      if (strpos($key, ":") !== false || strpos($key, "#") !== false) { $key = '"' . $key . '"'; }      $string = rtrim ($spaces.$key.': '.$value)."\n";    }    return $string;  }  /**     * Creates a literal block for dumping     * @access private     * @return string     * @param $value     * @param $indent int The value of the indent     */  private function _doLiteralBlock($value,$indent) {    if ($value === "\n") return '\n';    if (strpos($value, "\n") === false && strpos($value, "'") === false) {      return sprintf ("'%s'", $value);    }    if (strpos($value, "\n") === false && strpos($value, '"') === false) {      return sprintf ('"%s"', $value);    }    $exploded = explode("\n",$value);    $newValue = '|';    $indent += $this->_dumpIndent;    $spaces = str_repeat(' ',$indent);    foreach ($exploded as $line) {      $newValue .= "\n" . $spaces . ($line);    }    return $newValue;  }  /**     * Folds a string of text, if necessary     * @access private     * @return string     * @param $value The string you wish to fold     */  private function _doFolding($value,$indent) {    // Don't do anything if wordwrap is set to 0    if ($this->_dumpWordWrap !== 0 && is_string ($value) && strlen($value) > $this->_dumpWordWrap) {      $indent += $this->_dumpIndent;      $indent = str_repeat(' ',$indent);      $wrapped = wordwrap($value,$this->_dumpWordWrap,"\n$indent");      $value = ">\n".$indent.$wrapped;    } else {      if ($this->setting_dump_force_quotes && is_string ($value))        $value = '"' . $value . '"';    }    return $value;  }// LOADING FUNCTIONS  private function __load($input) {    $Source = $this->loadFromSource($input);    return $this->loadWithSource($Source);  }  private function __loadString($input) {    $Source = $this->loadFromString($input);    return $this->loadWithSource($Source);  }  private function loadWithSource($Source) {    if (empty ($Source)) return array();    if ($this->setting_use_syck_is_possible && function_exists ('syck_load')) {      $array = syck_load (implode ('', $Source));      return is_array($array) ? $array : array();    }    $this->path = array();    $this->result = array();    $cnt = count($Source);    for ($i = 0; $i < $cnt; $i++) {      $line = $Source[$i];      $this->indent = strlen($line) - strlen(ltrim($line));      $tempPath = $this->getParentPathByIndent($this->indent);      $line = self::stripIndent($line, $this->indent);      if (self::isComment($line)) continue;      if (self::isEmpty($line)) continue;      $this->path = $tempPath;      $literalBlockStyle = self::startsLiteralBlock($line);      if ($literalBlockStyle) {        $line = rtrim ($line, $literalBlockStyle . " \n");        $literalBlock = '';        $line .= $this->LiteralPlaceHolder;        while (++$i < $cnt && $this->literalBlockContinues($Source[$i], $this->indent)) {          $literalBlock = $this->addLiteralLine($literalBlock, $Source[$i], $literalBlockStyle);        }        $i--;      }      while (++$i < $cnt && self::greedilyNeedNextLine($line)) {        $line = rtrim ($line, " \n\t\r") . ' ' . ltrim ($Source[$i], " \t");      }      $i--;      if (strpos ($line, '#')) {        if (strpos ($line, '"') === false && strpos ($line, "'") === false)          $line = preg_replace('/\s+#(.+)$/','',$line);      }      $lineArray = $this->_parseLine($line);      if ($literalBlockStyle)        $lineArray = $this->revertLiteralPlaceHolder ($lineArray, $literalBlock);      $this->addArray($lineArray, $this->indent);      foreach ($this->delayedPath as $indent => $delayedPath)        $this->path[$indent] = $delayedPath;      $this->delayedPath = array();    }    return $this->result;  }  private function loadFromSource ($input) {    if (!empty($input) && strpos($input, "\n") === false && file_exists($input))    return file($input);    return $this->loadFromString($input);  }  private function loadFromString ($input) {    $lines = explode("\n",$input);    foreach ($lines as $k => $_) {      $lines[$k] = rtrim ($_, "\r");    }    return $lines;  }  /**     * Parses YAML code and returns an array for a node     * @access private     * @return array     * @param string $line A line from the YAML file     */  private function _parseLine($line) {    if (!$line) return array();    $line = trim($line);    if (!$line) return array();    $array = array();    $group = $this->nodeContainsGroup($line);    if ($group) {      $this->addGroup($line, $group);      $line = $this->stripGroup ($line, $group);    }    if ($this->startsMappedSequence($line))      return $this->returnMappedSequence($line);    if ($this->startsMappedValue($line))      return $this->returnMappedValue($line);    if ($this->isArrayElement($line))     return $this->returnArrayElement($line);    if ($this->isPlainArray($line))     return $this->returnPlainArray($line);    return $this->returnKeyValuePair($line);  }  /**     * Finds the type of the passed value, returns the value as the new type.     * @access private     * @param string $value     * @return mixed     */  private function _toType($value) {    if ($value === '') return null;    $first_character = $value[0];    $last_character = substr($value, -1, 1);    $is_quoted = false;    do {      if (!$value) break;      if ($first_character != '"' && $first_character != "'") break;      if ($last_character != '"' && $last_character != "'") break;      $is_quoted = true;    } while (0);    if ($is_quoted)      return strtr(substr ($value, 1, -1), array ('\\"' => '"', '\'\'' => '\'', '\\\'' => '\''));    if (strpos($value, ' #') !== false && !$is_quoted)      $value = preg_replace('/\s+#(.+)$/','',$value);    if (!$is_quoted) $value = str_replace('\n', "\n", $value);    if ($first_character == '[' && $last_character == ']') {      // Take out strings sequences and mappings      $innerValue = trim(substr ($value, 1, -1));      if ($innerValue === '') return array();      $explode = $this->_inlineEscape($innerValue);      // Propagate value array      $value = array();      foreach ($explode as $v) {        $value[] = $this->_toType($v);      }      return $value;    }    if (strpos($value,': ')!==false && $first_character != '{') {      $array = explode(': ',$value);      $key = trim($array[0]);      array_shift($array);      $value = trim(implode(': ',$array));      $value = $this->_toType($value);      return array($key => $value);    }    if ($first_character == '{' && $last_character == '}') {      $innerValue = trim(substr ($value, 1, -1));      if ($innerValue === '') return array();      // Inline Mapping      // Take out strings sequences and mappings      $explode = $this->_inlineEscape($innerValue);      // Propagate value array      $array = array();      foreach ($explode as $v) {        $SubArr = $this->_toType($v);        if (empty($SubArr)) continue;        if (is_array ($SubArr)) {          $array[key($SubArr)] = $SubArr[key($SubArr)]; continue;        }        $array[] = $SubArr;      }      return $array;    }    if ($value == 'null' || $value == 'NULL' || $value == 'Null' || $value == '' || $value == '~') {      return null;    }    if ( is_numeric($value) && preg_match ('/^(-|)[1-9]+[0-9]*$/', $value) ){      $intvalue = (int)$value;      if ($intvalue != PHP_INT_MAX)        $value = $intvalue;      return $value;    }    if (in_array($value,                 array('true', 'on', '+', 'yes', 'y', 'True', 'TRUE', 'On', 'ON', 'YES', 'Yes', 'Y'))) {      return true;    }    if (in_array(strtolower($value),                 array('false', 'off', '-', 'no', 'n'))) {      return false;    }    if (is_numeric($value)) {      if ($value === '0') return 0;      if (rtrim ($value, 0) === $value)        $value = (float)$value;      return $value;    }    return $value;  }  /**     * Used in inlines to check for more inlines or quoted strings     * @access private     * @return array     */  private function _inlineEscape($inline) {    // There's gotta be a cleaner way to do this...    // While pure sequences seem to be nesting just fine,    // pure mappings and mappings with sequences inside can't go very    // deep. This needs to be fixed.    $seqs = array();    $maps = array();    $saved_strings = array();    // Check for strings    $regex = '/(?:(")|(?:\'))((?(1)[^"]+|[^\']+))(?(1)"|\')/';    if (preg_match_all($regex,$inline,$strings)) {      $saved_strings = $strings[0];      $inline = preg_replace($regex,'YAMLString',$inline);    }    unset($regex);    $i = 0;    do {    // Check for sequences    while (preg_match('/([^{}\[]+)\]/U',$inline,$matchseqs)) {      $seqs[] = $matchseqs[0];      $inline = preg_replace('/([^{}\[]+)\]/U', ('YAMLSeq' . (count($seqs) - 1) . 's'), $inline, 1);    }    // Check for mappings    while (preg_match('/{([^{}]+)}/U',$inline,$matchmaps)) {      $maps[] = $matchmaps[0];      $inline = preg_replace('/{([^{}]+)}/U', ('YAMLMap' . (count($maps) - 1) . 's'), $inline, 1);    }    if ($i++ >= 10) break;    } while (strpos ($inline, '[') !== false || strpos ($inline, '{') !== false);    $explode = explode(', ',$inline);    $stringi = 0; $i = 0;    while (1) {    // Re-add the sequences    if (!empty($seqs)) {      foreach ($explode as $key => $value) {        if (strpos($value,'YAMLSeq') !== false) {          foreach ($seqs as $seqk => $seq) {            $explode[$key] = str_replace(('YAMLSeq'.$seqk.'s'),$seq,$value);            $value = $explode[$key];          }        }      }    }    // Re-add the mappings    if (!empty($maps)) {      foreach ($explode as $key => $value) {        if (strpos($value,'YAMLMap') !== false) {          foreach ($maps as $mapk => $map) {            $explode[$key] = str_replace(('YAMLMap'.$mapk.'s'), $map, $value);            $value = $explode[$key];          }        }      }    }    // Re-add the strings    if (!empty($saved_strings)) {      foreach ($explode as $key => $value) {        while (strpos($value,'YAMLString') !== false) {          $explode[$key] = preg_replace('/YAMLString/',$saved_strings[$stringi],$value, 1);          unset($saved_strings[$stringi]);          ++$stringi;          $value = $explode[$key];        }      }    }    $finished = true;    foreach ($explode as $key => $value) {      if (strpos($value,'YAMLSeq') !== false) {        $finished = false; break;      }      if (strpos($value,'YAMLMap') !== false) {        $finished = false; break;      }      if (strpos($value,'YAMLString') !== false) {        $finished = false; break;      }    }    if ($finished) break;    $i++;    if ($i > 10)      break; // Prevent infinite loops.    }    return $explode;  }  private function literalBlockContinues ($line, $lineIndent) {    if (!trim($line)) return true;    if (strlen($line) - strlen(ltrim($line)) > $lineIndent) return true;    return false;  }  private function referenceContentsByAlias ($alias) {    do {      if (!isset($this->SavedGroups[$alias])) { echo "Bad group name: $alias."; break; }      $groupPath = $this->SavedGroups[$alias];      $value = $this->result;      foreach ($groupPath as $k) {        $value = $value[$k];      }    } while (false);    return $value;  }  private function addArrayInline ($array, $indent) {      $CommonGroupPath = $this->path;      if (empty ($array)) return false;      foreach ($array as $k => $_) {        $this->addArray(array($k => $_), $indent);        $this->path = $CommonGroupPath;      }      return true;  }  private function addArray ($incoming_data, $incoming_indent) {   // print_r ($incoming_data);    if (count ($incoming_data) > 1)      return $this->addArrayInline ($incoming_data, $incoming_indent);    $key = key ($incoming_data);    $value = isset($incoming_data[$key]) ? $incoming_data[$key] : null;    if ($key === '__!YAMLZero') $key = '0';    if ($incoming_indent == 0 && !$this->_containsGroupAlias && !$this->_containsGroupAnchor) { // Shortcut for root-level values.      if ($key || $key === '' || $key === '0') {        $this->result[$key] = $value;      } else {        $this->result[] = $value; end ($this->result); $key = key ($this->result);      }      $this->path[$incoming_indent] = $key;      return;    }    $history = array();    // Unfolding inner array tree.    $history[] = $_arr = $this->result;    foreach ($this->path as $k) {      $history[] = $_arr = $_arr[$k];    }    if ($this->_containsGroupAlias) {      $value = $this->referenceContentsByAlias($this->_containsGroupAlias);      $this->_containsGroupAlias = false;    }    // Adding string or numeric key to the innermost level or $this->arr.    if (is_string($key) && $key == '<<') {      if (!is_array ($_arr)) { $_arr = array (); }      $_arr = array_merge ($_arr, $value);    } else if ($key || $key === '' || $key === '0') {      if (!is_array ($_arr))        $_arr = array ($key=>$value);      else        $_arr[$key] = $value;    } else {      if (!is_array ($_arr)) { $_arr = array ($value); $key = 0; }      else { $_arr[] = $value; end ($_arr); $key = key ($_arr); }    }    $reverse_path = array_reverse($this->path);    $reverse_history = array_reverse ($history);    $reverse_history[0] = $_arr;    $cnt = count($reverse_history) - 1;    for ($i = 0; $i < $cnt; $i++) {      $reverse_history[$i+1][$reverse_path[$i]] = $reverse_history[$i];    }    $this->result = $reverse_history[$cnt];    $this->path[$incoming_indent] = $key;    if ($this->_containsGroupAnchor) {      $this->SavedGroups[$this->_containsGroupAnchor] = $this->path;      if (is_array ($value)) {        $k = key ($value);        if (!is_int ($k)) {          $this->SavedGroups[$this->_containsGroupAnchor][$incoming_indent + 2] = $k;        }      }      $this->_containsGroupAnchor = false;    }  }  private static function startsLiteralBlock ($line) {    $lastChar = substr (trim($line), -1);    if ($lastChar != '>' && $lastChar != '|') return false;    if ($lastChar == '|') return $lastChar;    // HTML tags should not be counted as literal blocks.    if (preg_match ('#<.*?>$#', $line)) return false;    return $lastChar;  }  private static function greedilyNeedNextLine($line) {    $line = trim ($line);    if (!strlen($line)) return false;    if (substr ($line, -1, 1) == ']') return false;    if ($line[0] == '[') return true;    if (preg_match ('#^[^:]+?:\s*\[#', $line)) return true;    return false;  }  private function addLiteralLine ($literalBlock, $line, $literalBlockStyle) {    $line = self::stripIndent($line);    $line = rtrim ($line, "\r\n\t ") . "\n";    if ($literalBlockStyle == '|') {      return $literalBlock . $line;    }    if (strlen($line) == 0)      return rtrim($literalBlock, ' ') . "\n";    if ($line == "\n" && $literalBlockStyle == '>') {      return rtrim ($literalBlock, " \t") . "\n";    }    if ($line != "\n")      $line = trim ($line, "\r\n ") . " ";    return $literalBlock . $line;  }   function revertLiteralPlaceHolder ($lineArray, $literalBlock) {     foreach ($lineArray as $k => $_) {      if (is_array($_))        $lineArray[$k] = $this->revertLiteralPlaceHolder ($_, $literalBlock);      else if (substr($_, -1 * strlen ($this->LiteralPlaceHolder)) == $this->LiteralPlaceHolder)               $lineArray[$k] = rtrim ($literalBlock, " \r\n");     }     return $lineArray;   }  private static function stripIndent ($line, $indent = -1) {    if ($indent == -1) $indent = strlen($line) - strlen(ltrim($line));    return substr ($line, $indent);  }  private function getParentPathByIndent ($indent) {    if ($indent == 0) return array();    $linePath = $this->path;    do {      end($linePath); $lastIndentInParentPath = key($linePath);      if ($indent <= $lastIndentInParentPath) array_pop ($linePath);    } while ($indent <= $lastIndentInParentPath);    return $linePath;  }  private function clearBiggerPathValues ($indent) {    if ($indent == 0) $this->path = array();    if (empty ($this->path)) return true;    foreach ($this->path as $k => $_) {      if ($k > $indent) unset ($this->path[$k]);    }    return true;  }  private static function isComment ($line) {    if (!$line) return false;    if ($line[0] == '#') return true;    if (trim($line, " \r\n\t") == '---') return true;    return false;  }  private static function isEmpty ($line) {    return (trim ($line) === '');  }  private function isArrayElement ($line) {    if (!$line) return false;    if ($line[0] != '-') return false;    if (strlen ($line) > 3)      if (substr($line,0,3) == '---') return false;    return true;  }  private function isHashElement ($line) {    return strpos($line, ':');  }  private function isLiteral ($line) {    if ($this->isArrayElement($line)) return false;    if ($this->isHashElement($line)) return false;    return true;  }  private static function unquote ($value) {    if (!$value) return $value;    if (!is_string($value)) return $value;    if ($value[0] == '\'') return trim ($value, '\'');    if ($value[0] == '"') return trim ($value, '"');    return $value;  }  private function startsMappedSequence ($line) {    return ($line[0] == '-' && substr ($line, -1, 1) == ':');  }  private function returnMappedSequence ($line) {    $array = array();    $key = self::unquote(trim(substr($line,1,-1)));    $array[$key] = array();    $this->delayedPath = array(strpos ($line, $key) + $this->indent => $key);    return array($array);  }  private function returnMappedValue ($line) {    $array = array();    $key = self::unquote (trim(substr($line,0,-1)));    $array[$key] = '';    return $array;  }  private function startsMappedValue ($line) {    return (substr ($line, -1, 1) == ':');  }  private function isPlainArray ($line) {    return ($line[0] == '[' && substr ($line, -1, 1) == ']');  }  private function returnPlainArray ($line) {    return $this->_toType($line);  }  private function returnKeyValuePair ($line) {    $array = array();    $key = '';    if (strpos ($line, ':')) {      // It's a key/value pair most likely      // If the key is in double quotes pull it out      if (($line[0] == '"' || $line[0] == "'") && preg_match('/^(["\'](.*)["\'](\s)*:)/',$line,$matches)) {        $value = trim(str_replace($matches[1],'',$line));        $key = $matches[2];      } else {        // Do some guesswork as to the key and the value        $explode = explode(':',$line);        $key = trim($explode[0]);        array_shift($explode);        $value = trim(implode(':',$explode));      }      // Set the type of the value. Int, string, etc      $value = $this->_toType($value);      if ($key === '0') $key = '__!YAMLZero';      $array[$key] = $value;    } else {      $array = array ($line);    }    return $array;  }  private function returnArrayElement ($line) {     if (strlen($line) <= 1) return array(array()); // Weird %)     $array = array();     $value = trim(substr($line,1));     $value = $this->_toType($value);     $array[] = $value;     return $array;  }  private function nodeContainsGroup ($line) {    $symbolsForReference = 'A-z0-9_\-';    if (strpos($line, '&') === false && strpos($line, '*') === false) return false; // Please die fast ;-)    if ($line[0] == '&' && preg_match('/^(&['.$symbolsForReference.']+)/', $line, $matches)) return $matches[1];    if ($line[0] == '*' && preg_match('/^(\*['.$symbolsForReference.']+)/', $line, $matches)) return $matches[1];    if (preg_match('/(&['.$symbolsForReference.']+)$/', $line, $matches)) return $matches[1];    if (preg_match('/(\*['.$symbolsForReference.']+$)/', $line, $matches)) return $matches[1];    if (preg_match ('#^\s*<<\s*:\s*(\*[^\s]+).*$#', $line, $matches)) return $matches[1];    return false;  }  private function addGroup ($line, $group) {    if ($group[0] == '&') $this->_containsGroupAnchor = substr ($group, 1);    if ($group[0] == '*') $this->_containsGroupAlias = substr ($group, 1);    //print_r ($this->path);  }  private function stripGroup ($line, $group) {    $line = trim(str_replace($group, '', $line));    return $line;  }}// Enable use of Spyc from command line// The syntax is the following: php spyc.php spyc.yamldefine ('SPYC_FROM_COMMAND_LINE', false);do {  if (!SPYC_FROM_COMMAND_LINE) break;  if (empty ($_SERVER['argc']) || $_SERVER['argc'] < 2) break;  if (empty ($_SERVER['PHP_SELF']) || $_SERVER['PHP_SELF'] != 'spyc.php') break;  $file = $argv[1];  printf ("Spyc loading file: %s\n", $file);  print_r (spyc_load_file ($file));} while (0);

第二步：测试数据：

spyc.yaml： （ps:名字可以随便起，但是必须以yaml为扩展名）

name: John Smithage: 37spouse:    name: Jane Smith    age: 25children:    - name: Jimmy Smith        age: 15    - name: Jenny Smith        age 12

第三步：示例代码：

test.php:

<?phpinclude_once 'spyc.php';$array[] = 'Sequence item';$array['The Key'] = 'Mapped value';$array[] = array('A sequence','of a sequence');$array[] = array('first' => 'A sequence','second' => 'of mapped values');$array['Mapped'] = array('A sequence','which is mapped');$array['A Note'] = 'What if your text is too long?';$array['Another Note'] = 'If that is the case, the dumper will probably fold your text by using a block. Kinda like this.';$array['The trick?'] = 'The trick is that we overrode the default indent, 2, to 4 and the default wordwrap, 40, to 60.';$array['Old Dog'] = "And if you want\n to preserve line breaks, \ngo ahead!";$array['key:withcolon'] = "Should support this to";//读取：$yaml = Spyc::YAMLDump($array,4,60);//解析1：$data = Spyc::YAMLLoad('spyc.yaml');//解析2：//解析更常用，所以还提供了函数，上面的语句等价于：$data = spyc_load_file('spyc.yaml');var_dump($data);

第四步：

然后浏览器访问示例代码就可以看到效果了。解析出来的是数组结果的数据：

array  'name' => string 'John Smith' (length=10)  'age' => int 37  'spouse' =>     array      'name' => string 'Jane Smith' (length=10)      'age' => int 25  'children' =>     array      0 =>         array          'name' => string 'Jimmy Smith' (length=11)          'age' => int 15      1 =>         array          'name' => string 'Jenny Smith' (length=11)          0 => string 'age 12' (length=6)