46 个非常有用的 PHP 代码片段
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在编写代码的时候有个神奇的工具总是好的！在上篇文章《46 个非常有用的 PHP 代码片段（一）》中，我们分享了前20个PHP 代码片段。今天我们继续分享后20+PHP代码片段，它们不仅可以帮助你开发 PHP 项目，而且对于 PHP 初学者也非常有帮助。
21.目录清单
使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹。
function list_files($dir){ if(is_dir($dir)) { if($handle = opendir($dir)) { while(($file = readdir($handle)) !== false) { if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/) { echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n"; } } closedir($handle); } }}语法：
<?php list_files("images/"); //This will list all files of images folder?>22.检测用户语言
使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言。
function get_client_language($availableLanguages, $default='en'){ if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) { $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']); foreach ($langs as $value){ $choice=substr($value,0,2); if(in_array($choice, $availableLanguages)){ return $choice; } } } return $default;}23.查看 CSV 文件
function readCSV($csvFile){ $file_handle = fopen($csvFile, 'r'); while (!feof($file_handle) ) { $line_of_text[] = fgetcsv($file_handle, 1024); } fclose($file_handle); return $line_of_text;}语法：
<?php$csvFile = "test.csv";$csv = readCSV($csvFile);$a = csv[0][0]; // This will get value of Column 1 & Row 1?>24.从 PHP 数据创建 CSV 文件
function generateCsv($data, $delimiter = ',', $enclosure = '"') { $handle = fopen('php://temp', 'r+'); foreach ($data as $line) { fputcsv($handle, $line, $delimiter, $enclosure); } rewind($handle); while (!feof($handle)) { $contents .= fread($handle, 8192); } fclose($handle); return $contents;}语法：
<?php$data[0] = "apple";$data[1] = "oranges";generateCsv($data, $delimiter = ',', $enclosure = '"');?>25.解析 XML 数据
$xml_string="<?xml version='1.0'?><moleculedb> <molecule name='Benzine'> <symbol>ben</symbol> <code>A</code> </molecule> <molecule name='Water'> <symbol>h2o</symbol> <code>K</code> </molecule></moleculedb>";//load the xml string using simplexml function$xml = simplexml_load_string($xml_string);//loop through the each node of moleculeforeach ($xml->molecule as $record){ //attribute are accessted by echo $record['name'], ' '; //node are accessted by -> operator echo $record->symbol, ' '; echo $record->code, '<br />';}26.解析 JSON 数据
$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';$obj=json_decode($json_string);//print the parsed dataecho $obj->name; //displays rolfecho $obj->office[0]; //displays google27.获取当前页面 URL
这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面。
function current_url(){$url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];$validURL = str_replace("&", "&", $url);return validURL;}语法：
<?phpecho "Currently you are on: ".current_url();?>28.从任意的 Twitter 账号获取最新的 Tweet
function my_twitter($username) { $no_of_tweets = 1; $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets; $xml = simplexml_load_file($feed); foreach($xml->children() as $child) { foreach ($child as $value) { if($value->getName() == "link") $link = $value['href']; if($value->getName() == "content") { $content = $value . ""; echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title=""> </a></p>'; } } } }语法：
<?php$handle = "koonktech";my_twitter($handle);?>29.转发数量
使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量。
function tweetCount($url) { $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url); $element = new SimpleXmlElement($content); $retweets = $element->story->url_count; if($retweets){ return $retweets; } else { return 0; }}语法：
<?php$url = "http://blog.koonk.com";$count = tweetCount($url);return $count;?>30.计算两个日期的差
<?php$date1 = date( 'Y-m-d' );$date2 = "2015-12-04";$diff = abs(strtotime($date2) - strtotime($date1));$years = floor($diff / (365*60*60*24));$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));printf("%d years, %d months, %d days\n", $years, $months, $days);-------------------------------------------------------- OR$date1 = new DateTime("2007-03-24");$date2 = new DateTime("2009-06-26");$interval = $date1->diff($date2);echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days "; // shows the total amount of days (not divided into years, months and days like above)echo "difference " . $interval->days . " days ";-------------------------------------------------------- OR/** * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff() * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved. * * See here for original code: * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup */function _date_range_limit($start, $end, $adj, $a, $b, $result){ if ($result[$a] < $start) { $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1; $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1); } if ($result[$a] >= $end) { $result[$b] += intval($result[$a] / $adj); $result[$a] -= $adj * intval($result[$a] / $adj); } return $result;}function _date_range_limit_days($base, $result){ $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31); _date_range_limit(1, 13, 12, "m", "y", &$base); $year = $base["y"]; $month = $base["m"]; if (!$result["invert"]) { while ($result["d"] < 0) { $month--; if ($month < 1) { $month += 12; $year--; } $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0); $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month]; $result["d"] += $days; $result["m"]--; } } else { while ($result["d"] < 0) { $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0); $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month]; $result["d"] += $days; $result["m"]--; $month++; if ($month > 12) { $month -= 12; $year++; } } } return $result;}function _date_normalize($base, $result){ $result = _date_range_limit(0, 60, 60, "s", "i", $result); $result = _date_range_limit(0, 60, 60, "i", "h", $result); $result = _date_range_limit(0, 24, 24, "h", "d", $result); $result = _date_range_limit(0, 12, 12, "m", "y", $result); $result = _date_range_limit_days(&$base, &$result); $result = _date_range_limit(0, 12, 12, "m", "y", $result); return $result;}/** * Accepts two unix timestamps. */function _date_diff($one, $two){ $invert = false; if ($one > $two) { list($one, $two) = array($two, $one); $invert = true; } $key = array("y", "m", "d", "h", "i", "s"); $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one)))); $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two)))); $result = array(); $result["y"] = $b["y"] - $a["y"]; $result["m"] = $b["m"] - $a["m"]; $result["d"] = $b["d"] - $a["d"]; $result["h"] = $b["h"] - $a["h"]; $result["i"] = $b["i"] - $a["i"]; $result["s"] = $b["s"] - $a["s"]; $result["invert"] = $invert ? 1 : 0; $result["days"] = intval(abs(($one - $two)/86400)); if ($invert) { _date_normalize(&$a, &$result); } else { _date_normalize(&$b, &$result); } return $result;}$date = "2014-12-04 19:37:22";echo '<pre>';print_r( _date_diff( strtotime($date), time() ) );echo '</pre>'; ?>31.删除文件夹内容
function Delete($path){ if (is_dir($path) === true) { $files = array_diff(scandir($path), array('.', '..')); foreach ($files as $file) { Delete(realpath($path) . '/' . $file); } return rmdir($path); } else if (is_file($path) === true) { return unlink($path); } return false;}语法：
<?php$path = "images/";Delete($path); // This will delete images folder along with its contents.?>32.搜索和高亮字符串中的关键字
function highlighter_text($text, $words){ $split_words = explode( " " , $words ); foreach($split_words as $word) { $color = "#4285F4"; $text = preg_replace("|($word)|Ui" , "<span style=\"color:".$color.";\"><b>$1</b></span>" , $text ); } return $text;}语法：
<?php$string = "I like chocolates and I like apples";$words = "apple";echo highlighter_text($string ,$words);?>33.写入文件
<?$filename = 'blog.csv';$fp = fopen($filename, 'w');$output = " Hello ";$output .= " World! ";$output .= "\r\n";fputs($fp, $output);fclose($fp);?>34.根据 URL 下载图片
function imagefromURL($image,$rename){$ch = curl_init($image);curl_setopt($ch, CURLOPT_HEADER, 0);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);$rawdata=curl_exec ($ch);curl_close ($ch);$fp = fopen("$rename",'w');fwrite($fp, $rawdata); fclose($fp);}语法：
<?php$url = "http://koonk.com/images/logo.png";$rename = "koonk.png";imagefromURL($url,$rename);?>35.检测 URL 是否有效
function isvalidURL($url){$check = 0;if (filter_var($url, FILTER_VALIDATE_URL) !== false) { $check = 1;}return $check;}语法：
<?php$url = "http://koonk.com";$check = checkvalidURL($url);echo $check; //if returns 1 then URL is valid.?>36.生成二维码
function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0') { $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:"); if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL"))) { $type = "TXT"; } if (!preg_match('/^'.$types[$type].'/', $data)) { $data = str_replace("\\", "", $types[$type]).$data; } $ch = curl_init(); $data = urlencode($data); curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart'); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_TIMEOUT, 30); $response = curl_exec($ch); curl_close($ch); return $response;}语法：
<?phpheader("Content-type: image/png");echo qr_code("http://koonk.com", "URL");?>37.计算两个地图坐标之间的距离
function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) { $theta = $longitude1 - $longitude2; $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta))); $miles = acos($miles); $miles = rad2deg($miles); $miles = $miles * 60 * 1.1515; $feet = $miles * 5280; $yards = $feet / 3; $kilometers = $miles * 1.609344; $meters = $kilometers * 1000; return compact('miles','feet','yards','kilometers','meters'); }语法：
<?php$point1 = array('lat' => 40.770623, 'long' => -73.964367);$point2 = array('lat' => 40.758224, 'long' => -73.917404);$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);foreach ($distance as $unit => $value) { echo $unit.': '.number_format($value,4).'<br />';}?>38.获取一个特定话题标签的所有 Tweets
function getTweets($hash_tag) { $url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ; echo "<p>Connecting to <strong>$url</strong> ...</p>"; $ch = curl_init($url); curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE); $xml = curl_exec ($ch); curl_close ($ch); //If you want to see the response from Twitter, uncomment this next part out: //echo "<p>Response:</p>"; //echo "<pre>".htmlspecialchars($xml)."</pre>"; $affected = 0; $twelement = new SimpleXMLElement($xml); foreach ($twelement->entry as $entry) { $text = trim($entry->title); $author = trim($entry->author->name); $time = strtotime($entry->published); $id = $entry->id; echo "<p>Tweet from ".$author.": <strong>".$text."</strong> <em>Posted ".date('n/j/y g:i a',$time)."</em></p>"; } return true ;}39.添加 th,st,nd 或者 rd 作为数字的后缀
Friday the 13th
$test_c = abs($cdnl) % 10; $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th' : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) ? 'th' : 'st' : 'nd' : 'rd' : 'th')); return $cdnl.$ext; }语法：
<?php$number = 10;echo ordinal($number); //output is 10th?>40.限制文件下载的速度
<?php// local file that should be send to the client$local_file = 'test-file.zip';// filename that the user gets as default$download_file = 'your-download-name.zip';// set the download rate limit (=> 20,5 kb/s)$download_rate = 20.5; if(file_exists($local_file) && is_file($local_file)) { // send headers header('Cache-control: private'); header('Content-Type: application/octet-stream'); header('Content-Length: '.filesize($local_file)); header('Content-Disposition: filename='.$download_file); // flush content flush(); // open file stream $file = fopen($local_file, "r"); while(!feof($file)) { // send the current file part to the browser print fread($file, round($download_rate * 1024)); // flush the content to the browser flush(); // sleep one second sleep(1); } // close file stream fclose($file);}else { die('Error: The file '.$local_file.' does not exist!');}?>41.把文本转换成图片
<?phpheader("Content-type: image/png");$string = $_GET['text'];$im = imagecreatefrompng("images/button.png");$color = imagecolorallocate($im, 255, 255, 255);$px = (imagesx($im) - 7.5 * strlen($string)) / 2;$py = 9;$fontSize = 1;imagestring($im, fontSize, $px, $py, $string, $color);imagepng($im);imagedestroy($im);?>42.获取远程文件的大小
function remote_filesize($url, $user = "", $pw = ""){ ob_start(); $ch = curl_init($url); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_NOBODY, 1); if(!empty($user) && !empty($pw)) { $headers = array('Authorization: Basic ' . base64_encode("$user:$pw")); curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); } $ok = curl_exec($ch); curl_close($ch); $head = ob_get_contents(); ob_end_clean(); $regex = '/Content-Length:\s([0-9].+?)\s/'; $count = preg_match($regex, $head, $matches); return isset($matches[1]) ? $matches[1] : "unknown";}语法：
<?php$file = "http://koonk.com/images/logo.png";$size = remote_filesize($url);echo $size;?>43.使用 imagebrick 进行 pdf 到图像的转换
<?php$pdf_file = './pdf/demo.pdf';$save_to = './jpg/demo.jpg'; //make sure that apache has permissions to write in this folder! (common problem)//execute ImageMagick command 'convert' and convert PDF to JPG with applied settingsexec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);if($return_var == 0) { //if exec successfuly converted pdf to jpg print "Conversion OK";}else print "Conversion failed.<br />".$output;?>44.使用 tinyurl 生成短网址
function get_tiny_url($url) { $ch = curl_init(); $timeout = 5; curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout); $data = curl_exec($ch); curl_close($ch); return $data; }语法：
<?php$url = "http://blog.koonk.com/2015/07/Hello-World";$tinyurl = get_tiny_url($url);echo $tinyurl;?>45.youtube 下载链接生成器
使用下面的 PHP 片段可以让你的用户下载 Youtube 视频。
function str_between($string, $start, $end){ $string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }function get_youtube_download_link(){ $youtube_link = $_GET['youtube']; $youtube_page = file_get_contents($youtube_link); $v_id = str_between($youtube_page, "&video_id=", "&"); $t_id = str_between($youtube_page, "&t=", "&"); $flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id"; $hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6"; $mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18"; $threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17"; echo "\t\tDownload (right-click > save as):\n\t\t"; echo "<a href=\"$flv_link\">FLV</a>\n\t\t"; echo "<a href=\"$hq_flv_link\">HQ FLV (if available)</a>\n\t\t"; echo "<a href=\"$mp4_link\">MP4</a>\n\t\t"; echo "<a href=\"$threegp_link\">3GP</a><br><br>\n";}46.Facebook 样式的时间戳
Facebook (x mins age, y hours ago etc)
function nicetime($date){ if(empty($date)) { return "No date provided"; } $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade"); $lengths = array("60","60","24","7","4.35","12","10"); $now = time(); $unix_date = strtotime($date); // check validity of date if(empty($unix_date)) { return "Bad date"; } // is it future date or past date if($now > $unix_date) { $difference = $now - $unix_date; $tense = "ago"; } else { $difference = $unix_date - $now; $tense = "from now"; } for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) { $difference /= $lengths[$j]; } $difference = round($difference); if($difference != 1) { $periods[$j].= "s"; } return "$difference $periods[$j] {$tense}";}语法：
<?php$date = "2015-07-05 03:45";$result = nicetime($date); // 2 days ago?>英文原文：46 USEFUL PHP CODE SNIPPETS THAT CAN HELP YOU WITH YOUR PHP PROJECTS
译文源自：http://www.oschina.net/question/2012764_246023本文转自：http://www.imooc.com/article/1376
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