php项目常用字符串函数

/**

 * 字符串截取,并且将多余内容替换为指定字符

 * @param 原字符串 $string

 * @param 截取的长度 $sublen

 * @param 开始位置 $start

 * @param 编码格式 $code

 * @param 被截取掉的字符的显示比如 xxxx..... $suffix

 * @return string

 */

public function mb_cut_str($string, $sublen, $suffix = '...', $code = 'UTF-8'){

$len = mb_strlen($string, $code);

if ($sublen >= $len) {

return $string;

}

$string = mb_substr($string, 0, $sublen, $code) . $suffix;

return $string;

}

/**

 * 手机号验证

 * @param unknown $mobile

 * @return boolean

 */

public function is_mobile($mobile){

// return strlen($mobile) == 11 && preg_match("/^13[0-9]{1}[0-9]{8}$|15[0189]{1}[0-9]{8}$|189[0-9]{8}$/",$mobile);

return strlen($mobile) == 11 && preg_match("/^(13\d{9}|14[57]\d{8}|15\d{9}|17[6780]\d{8}|18\d{9})$/", $mobile) ? true : false;

}

/**

 * 邮箱验证

 * @param type $email 邮箱

 */

public function is_email($email){

return strlen($email) > 6 && preg_match("/^[\w-]+@([a-zA-Z0-9-]+\.){1,3}[a-zA-Z]+$/", $email);

}

/**

 * 检查密码长度是否符合规定

 * @param string $password

 * @return bool

 */

public function is_password($password){

$strlen = strlen($password);

return $strlen >= 6 && $strlen <= 20 ? true : false;

}

/**

 * 字符串标亮

 * @param type $str 字符串

 * @param type $keywords 关键字

 * @param type $color 标亮颜色类

 * @return type

 */

public function str_light($str, $keywords, $color = "red"){

if (empty($keywords)) {

return $str;

}

$arr = [];

if (is_array($keywords)) {

foreach ($keywords as $val) {

preg_match('/[' . $val . ']+/ius', $str, $arr);

$finalrep = "<font color=" . $color . ">" . $val . "</font>";

$str = str_replace($val, $finalrep, $str);

}

} else {

$finalrep = "<font color=" . $color . ">" . $keywords . "</font>";

$str = str_replace($keywords, $finalrep, $str);

}

return $str;

}

/**

 * 转义字符串中html标签,如果参数为数组则遍历

 * @param mixed $string 待转换的字符

 * @return mixed

 */

function htmlspecialchars_deep($string){

return is_array($string) ? array_map('htmlspecialchars_deep', $string) : htmlspecialchars($string, ENT_QUOTES);

}

//将手机号的中间部分换成指定字符

function mobile_asterisk($mobile, $replaceStr = '*'){

if (!$this->is_mobile($mobile)) {

return $mobile;

}

$mobile_asterisk = substr($mobile, 0, 2) . str_repeat("*", 7) . substr($mobile, 9, 3);

return $mobile_asterisk;

}

//将邮箱的中间部分换成指定字符

function email_asterisk($email){

if (!$this->is_email($email)) {

return $email;

}

$email = explode("@", $email);

$name = $email[0];

$extend = $email[1];

if (strlen($name) >= 5) {

$count = strlen($name);

$start = substr($name, 0, 2);

$end = substr($name, $count - 2, 2);

$centerLength = $count - 4;

if ($centerLength > 3) {

$centerLength = 3;

}

$name = $start . str_repeat("*", $centerLength) . $end;

}

$email = $name . "@" . $extend;

return $email;

}

/*

 * 格式化时间

 * @param int $timestamp 时间戳

 * @return string 格式化之后字符串

 */

function showTime($timestamp){

$diff = time() - $timestamp;

$lang = array('hour' => '小时前', 'minute' => '分钟前', 'second' => '秒前', 'day' => '天前');

$d = floor($diff / 3600 / 24);

if ($d >= 1) {

//return date("m-d H:i", $timestamp);

return $d . $lang['day'];

}

$h = floor($diff / 3600);

if ($h >= 1 && $h < 24) {

return $h . $lang['hour'];

}

$m = ceil($diff / 60);

if ($m >= 1 && $m < 60) {

return $m . $lang['minute'];

}

if ($diff > 0 && $diff < 60) {

return $m . $lang['second'];

} else {

return '刚刚';

}

}

/**

 * 隐藏用户名

 * @param $name 字符

 */

function hideUserName($name, $code = "UTF-8"){

if (!$name) {

return $name;

}

$result = "";

if ($this->is_mobile($name)) {

$result = substr($name, 0, 3);

$result .= str_repeat("*", 5);

$result .= substr($name, 8, 3);

return $result;

}

if ($this->is_email($name)) {

$array = explode("@", $name);

if (strlen($array[0]) < 2) {

return $name;

} else if (strlen($array[0]) == 2) {

$result = substr($array[0], 0, 1) . "*@" . $array[1];

return $result;

} else {

$len = strlen($array[0]);

$result = substr($array[0], 0, 1) . str_repeat("*", $len - 2);

$result .= substr($array[0], $len - 1, 1) . '@' . $array[1];

return $result;

}

}

if (mb_strlen($name, $code) < 2) {

return $name;

} else if (mb_strlen($name, $code) == 2) {

$result = mb_substr($name, 0, 1, $code) . "*";

return $result;

} else {

$len = mb_strlen($name, $code);

$result = mb_substr($name, 0, 1, $code) . str_repeat("*", $len - 2);

$result .= mb_substr($name, $len - 1, 1, $code);

return $result;

}

}

/**

 * 过滤html标签

 * @param $str 字符

 */

public function filterHtmlTag($str){

$str = preg_replace("/\s+/", "", $str); //过滤多余回车

$str = preg_replace('/<([a-z0-9]+).*?>/i', "", $str);

$str = preg_replace('/<\/([a-z0-9]+?)>/i', "", $str);

$str = str_replace(array('&nbsp;', '&ldquo;', '&rdquo;', '&hellip;', "&", " ", "　　", " "), "", $str);

$str = preg_replace('/&([a-z]+);/i', '', $str);

$str = str_replace('&;', "", $str);

return $str;

}

/**

 * 获取内容图片

 * @param  [type]  $data 内容数据

 * @param  integer $num  几张

 */

public function get_content_pic($data, $num = 1) {

$pattern = "/<img.*?src=[\'|\"](.*?)[\'|\"].*?[\/]?>/";

preg_match_all($pattern, $data, $match);

if (!empty($match[1])) {

return $num == 1 ? $match[1][0] : array_slice($match[1], 0, $num);

} else {

return false;

}

}

/**

 * 根据url地址获取id

 */

function getIdByUrl($url) {

$contentid = '';

//$path = parse_url($url, PHP_URL_PATH); // /news/nanshi/2-3.shtml

//$paths = explode("/", $path); //array(0=>'',1=>'news',2=>'nanshi',3=>'2-3.shtml')

//$contents = $paths[count($paths) - 1]; //2-3.shtml

$contents = basename($url);

if (strstr($contents, '.')) {

$conarr = explode('.', $contents); //array(0=>'2-3',1=>'shtml')

$contentid = str_replace('-', '_', $conarr[0]); //2_3

if (strstr($contentid, '_')) {

$conids = explode('_', $contentid); //array(0=>'2',1=>'3')

$contentid = $conids[0]; //2

}

}

return $contentid;

}