虽然PHP自带的函数库很强大，但是在日常很多情况下，我们也还得自己写自定义的函数去实现某些功能与需求。下面收集了一些比较实用的、解决一些常见需求的自定义函数，比如将网址字符串转换成超级链接、列出目录内容、验证邮件地址等等，如果你觉得好，可以收藏本页，方便以后翻阅～1. PHP可阅读随机字符串此代码将创建一个可阅读的字符串，使其更接近词典中的单词，实用且具有密码验证功能。 /************** *@length - length of random string (must be a multiple of 2) **************/ function readable_random_string($length = 6){ $conso=array("b","c","d","f","g","h","j","k","l", "m","n","p","r","s","t","v","w","x","y","z"); $vocal=array("a","e","i","o","u"); $password=""; srand ((double)microtime()*1000000); $max = $length/2; for($i=1; $i<=$max; $i++) { $password.=$conso[rand(0,19)]; $password.=$vocal[rand(0,4)]; } return $password; } 2. PHP生成一个随机字符串如果不需要可阅读的字符串，使用此函数替代，即可创建一个随机字符串，作为用户的随机密码等。 /************* *@l - length of random string */ function generate_rand($l){ $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; srand((double)microtime()*1000000); for($i=0; $i < $l; $i++) { $rand.= $c[rand()%strlen($c)]; } return $rand; } 3. PHP编码电子邮件地址使用此代码，可以将任何电子邮件地址编码为 html 字符实体，以防止被垃圾邮件程序收集。 function encode_email($email='info@domain.com', $linkText='Contact Us', $attrs ='class="emailencoder"' ) { // remplazar aroba y puntos $email = str_replace('@', '@', $email); $email = str_replace('.', '.', $email); $email = str_split($email, 5); $linkText = str_replace('@', '@', $linkText); $linkText = str_replace('.', '.', $linkText); $linkText = str_split($linkText, 5); $part1 = '<a href="ma'; $part2 = 'ilto:'; $part3 = '" '. $attrs .' >'; $part4 = '</a>'; $encoded = '<script type="text/javascript">'; $encoded .= "document.write('$part1');"; $encoded .= "document.write('$part2');"; foreach($email as $e) { $encoded .= "document.write('$e');"; } $encoded .= "document.write('$part3');"; foreach($linkText as $l) { $encoded .= "document.write('$l');"; } $encoded .= "document.write('$part4');"; $encoded .= '</script>'; return $encoded; } 4. PHP验证邮件地址电子邮件验证也许是中最常用的网页表单验证，此代码除了验证电子邮件地址，也可以选择检查邮件域所属 DNS 中的 MX 记录，使邮件验证功能更加强大。 function is_valid_email($email, $test_mx = false) { if(eregi("^([_a-z0-9-]+)(/.[_a-z0-9-]+)*@([a-z0-9-]+)(/.[a-z0-9-]+)*(/.[a-z]{2,4})$", $email)) if($test_mx) { list($username, $domain) = split("@", $email); return getmxrr($domain, $mxrecords); } else return true; else return false; } 5. PHP列出目录内容 function list_files($dir) { if(is_dir($dir)) { if($handle = opendir($dir)) { while(($file = readdir($handle)) !== false) { if($file != "." && $file != ".." && $file != "Thumbs.db") { echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."/n"; } } closedir($handle); } } } 6. PHP销毁目录删除一个目录，包括它的内容。 /***** *@dir - Directory to destroy *@virtual[optional]- whether a virtual directory */ function destroyDir($dir, $virtual = false) { $ds = DIRECTORY_SEPARATOR; $dir = $virtual ? realpath($dir) : $dir; $dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir; if (is_dir($dir) && $handle = opendir($dir)) { while ($file = readdir($handle)) { if ($file == '.' || $file == '..') { continue; } elseif (is_dir($dir.$ds.$file)) { destroyDir($dir.$ds.$file); } else { unlink($dir.$ds.$file); } } closedir($handle); rmdir($dir); return true; } else { return false; } }7. PHP解析 JSON 数据与大多数流行的 Web 服务如 twitter 通过开放 API 来提供数据一样，它总是能够知道如何解析 API 数据的各种传送格式，包括 JSON，XML 等等。 $json_string='{"id":1,"name":"foo","email":"foo@foobar.com","interest":["wordpress","php"]} '; $obj=json_decode($json_string); echo $obj->name; //prints foo echo $obj->interest[1]; //prints php 8. PHP解析 XML 数据 //xml string $xml_string="<?xml version='1.0'?> <users> <user id='398'> <name>Foo</name> <email>foo@bar.com</name> </user> <user id='867'> <name>Foobar</name> <email>foobar@foo.com</name> </user> </users>"; //load the xml string using simplexml $xml = simplexml_load_string($xml_string); //loop through the each node of user foreach ($xml->user as $user) { //access attribute echo $user['id'], ' '; //subnodes are accessed by -> operator echo $user->name, ' '; echo $user->email, '<br />'; } 9. PHP创建日志缩略名创建用户友好的日志缩略名。 function create_slug($string){ $slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string); return $slug; } 10. PHP获取客户端真实 IP 地址该函数将获取用户的真实 IP 地址，即便他使用代理服务器。 function getRealIpAddr() { if (!emptyempty($_SERVER['HTTP_CLIENT_IP'])) { $ip=$_SERVER['HTTP_CLIENT_IP']; } elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy { $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip=$_SERVER['REMOTE_ADDR']; } return $ip; } 11. PHP强制性文件下载为用户提供强制性的文件下载功能。 /******************** *@file - path to file */ function force_download($file) { if ((isset($file))&&(file_exists($file))) { header("Content-length: ".filesize($file)); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="' . $file . '"'); readfile("$file"); } else { echo "No file selected"; } } 12. PHP创建标签云 function getCloud( $data = array(), $minFontSize = 12, $maxFontSize = 30 ) { $minimumCount = min( array_values( $data ) ); $maximumCount = max( array_values( $data ) ); $spread = $maximumCount - $minimumCount; $cloudHTML = ''; $cloudTags = array(); $spread == 0 && $spread = 1; foreach( $data as $tag => $count ) { $size = $minFontSize + ( $count - $minimumCount ) * ( $maxFontSize - $minFontSize ) / $spread; $cloudTags[] = '<a style="font-size: ' . floor( $size ) . 'px' . '" href="#" title="/'' . $tag . '/' returned a count of ' . $count . '">' . htmlspecialchars( stripslashes( $tag ) ) . '</a>'; } return join( "/n", $cloudTags ) . "/n"; } /************************** **** Sample usage ***/ $arr = Array('Actionscript' => 35, 'Adobe' => 22, 'Array' => 44, 'Background' => 43, 'Blur' => 18, 'Canvas' => 33, 'Class' => 15, 'Color Palette' => 11, 'Crop' => 42, 'Delimiter' => 13, 'Depth' => 34, 'Design' => 8, 'Encode' => 12, 'Encryption' => 30, 'Extract' => 28, 'Filters' => 42); echo getCloud($arr, 12, 36); 13. PHP寻找两个字符串的相似性PHP 提供了一个极少使用的 similar_text 函数，但此函数非常有用，用于比较两个字符串并返回相似程度的百分比。 similar_text($string1, $string2, $percent); //$percent will have the percentage of similarity14. PHP在应用程序中使用 Gravatar 通用头像随着 WordPress 越来越普及，Gravatar 也随之流行。由于 Gravatar 提供了易于使用的 API，将其纳入应用程序也变得十分方便。 /****************** *@email - Email address to show gravatar for *@size - size of gravatar *@default - URL of default gravatar to use *@rating - rating of Gravatar(G, PG, R, X) */ function show_gravatar($email, $size, $default, $rating) { echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email). '&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px" height="'.$size.'px" />'; } 15. PHP在字符断点处截断文字所谓断字 (word break)，即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。 // Original PHP code by Chirp Internet: www.chirp.com.au // Please acknowledge use of this code by including this header. function myTruncate($string, $limit, $break=".", $pad="...") { // return with no change if string is shorter than $limit if(strlen($string) <= $limit) return $string; // is $break present between $limit and the end of the string? if(false !== ($breakpoint = strpos($string, $break, $limit))) { if($breakpoint < strlen($string) - 1) { $string = substr($string, 0, $breakpoint) . $pad; } } return $string; } /***** Example ****/ $short_string=myTruncate($long_string, 100, ' '); 16. PHP文件 Zip 压缩 /* creates a compressed zip file */ function create_zip($files = array(),$destination = '',$overwrite = false) { //if the zip file already exists and overwrite is false, return false if(file_exists($destination) && !$overwrite) { return false; } //vars $valid_files = array(); //if files were passed in... if(is_array($files)) { //cycle through each file foreach($files as $file) { //make sure the file exists if(file_exists($file)) { $valid_files[] = $file; } } } //if we have good files... if(count($valid_files)) { //create the archive $zip = new ZipArchive(); if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) { return false; } //add the files foreach($valid_files as $file) { $zip->addFile($file,$file); } //debug //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status; //close the zip -- done! $zip->close(); //check to make sure the file exists return file_exists($destination); } else { return false; } } /***** Example Usage ***/ $files=array('file1.jpg', 'file2.jpg', 'file3.gif'); create_zip($files, 'myzipfile.zip', true); 17. PHP解压缩 Zip 文件 /********************** *@file - path to zip file *@destination - destination directory for unzipped files */ function unzip_file($file, $destination){ // create object $zip = new ZipArchive() ; // open archive if ($zip->open($file) !== TRUE) { die (’Could not open archive’); } // extract contents to destination directory $zip->extractTo($destination); // close archive $zip->close(); echo 'Archive extracted to directory'; } 18. PHP为 URL 地址预设 http 字符串有时需要接受一些表单中的网址输入，但用户很少添加 http:// 字段，此代码将为网址添加该字段。 if (!preg_match("/^(http|ftp):/", $_POST['url'])) { $_POST['url'] = 'http://'.$_POST['url']; } 19. PHP将网址字符串转换成超级链接该函数将 URL 和 E-mail 地址字符串转换为可点击的超级链接。 function makeClickableLinks($text) { $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)', '<a href="/1">/1</a>', $text); $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)', '/1<a href="http:///2">/2</a>', $text); $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})', '<a href="mailto:/1">/1</a>', $text); return $text; } 20. PHP调整图像尺寸创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。 /********************** *@filename - path to the image *@tmpname - temporary path to thumbnail *@xmax - max width *@ymax - max height */ function resize_image($filename, $tmpname, $xmax, $ymax) { $ext = explode(".", $filename); $ext = $ext[count($ext)-1]; if($ext == "jpg" || $ext == "jpeg") $im = imagecreatefromjpeg($tmpname); elseif($ext == "png") $im = imagecreatefrompng($tmpname); elseif($ext == "gif") $im = imagecreatefromgif($tmpname); $x = imagesx($im); $y = imagesy($im); if($x <= $xmax && $y <= $ymax) return $im; if($x >= $y) { $newx = $xmax; $newy = $newx * $y / $x; } else { $newy = $ymax; $newx = $x / $y * $newy; } $im2 = imagecreatetruecolor($newx, $newy); imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y); return $im2; }21. PHP检测 ajax 请求大多数的 JavaScript 框架如 jquery，Mootools 等，在发出 Ajax 请求时，都会发送额外的 HTTP_X_REQUESTED_WITH 头部信息，头当他们一个ajax请求，因此你可以在服务器端侦测到 Ajax 请求。 if(!emptyempty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){ //If AJAX Request Then }else{ //something else 22. 关键词高亮 function highlight($sString, $aWords) { if (!is_array ($aWords) || emptyempty ($aWords) || !is_string ($sString)) { return false; } $sWords = implode ('|', $aWords); return preg_replace ('@/b('.$sWords.')/b@si', '<strong style="background-color:yellow">$1</strong>', $sString); }23. 获取你的Feedburner的用户 function get_average_readers($feed_id,$interval = 7){ $today = date('Y-m-d', strtotime("now")); $ago = date('Y-m-d', strtotime("-".$interval." days")); $feed_url="https://feedburner.google.com/api/awareness/1.0/GetFeedData?uri=".$feed_id."&dates=".$ago.",".$today; $ch = curl_init(); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_URL, $feed_url); $data = curl_exec($ch); curl_close($ch); $xml = new SimpleXMLElement($data); $fb = $xml->feed->entry['circulation']; $nb = 0; foreach($xml->feed->children() as $circ){ $nb += $circ['circulation']; } return round($nb/$interval); }24. 自动生成密码 function generatePassword($length=9, $strength=0) { $vowels = 'aeuy'; $consonants = 'bdghjmnpqrstvz'; if ($strength >= 1) { $consonants .= 'BDGHJLMNPQRSTVWXZ'; } if ($strength >= 2) { $vowels .= "AEUY"; } if ($strength >= 4) { $consonants .= '23456789'; } if ($strength >= 8 ) { $vowels .= '@#$%'; } $password = ''; $alt = time() % 2; for ($i = 0; $i < $length; $i++) { if ($alt == 1) { $password .= $consonants[(rand() % strlen($consonants))]; $alt = 0; } else { $password .= $vowels[(rand() % strlen($vowels))]; $alt = 1; } } return $password; }25. 压缩多个CSS文件 header('Content-type: text/css'); ob_start("compress"); function compress($buffer) { /* remove comments */ $buffer = preg_replace('!//*[^*]*/*+([^/][^*]*/*+)*/!', '', $buffer); /* remove tabs, spaces, newlines, etc. */ $buffer = str_replace(array("/r/n", "/r", "/n", "/t", ' ', ' ', ' '), '', $buffer); return $buffer; } /* your css files */ include('master.css'); include('typography.css'); include('grid.css'); include('print.css'); include('handheld.css'); ob_end_flush();26. 获取短网址 function getTinyUrl($url) { return file_get_contents("http://tinyurl.com/api-create.php?url=".$url); }27. 根据生日计算年龄 function age($date){ $year_diff = ''; $time = strtotime($date); if(FALSE === $time){ return ''; } $date = date('Y-m-d', $time); list($year,$month,$day) = explode("-",$date); $year_diff = date("Y") – $year; $month_diff = date("m") – $month; $day_diff = date("d") – $day; if ($day_diff < 0 || $month_diff < 0) $year_diff–; return $year_diff; }28. 计算执行时间 //Create a variable for start time $time_start = microtime(true); // Place your PHP/HTML/JavaScript/CSS/Etc. Here //Create a variable for end time $time_end = microtime(true); //Subtract the two times to get seconds $time = $time_end - $time_start; echo 'Script took '.$time.' seconds to execute';29. PHP的维护模式 function maintenance($mode = FALSE){ if($mode){ if(basename($_SERVER['SCRIPT_FILENAME']) != 'maintenance.php'){ header("Location: http://example.com/maintenance.php"); exit; } }else{ if(basename($_SERVER['SCRIPT_FILENAME']) == 'maintenance.php'){ header("Location: http://example.com/"); exit; } } }30. 阻止CSS样式被缓存<link href="/stylesheet.css?<?php echo time(); ?>" rel="stylesheet" type="text/css" /&glt;31. 为数字增加 st/nd/rd 等 function make_ranked($rank) { $last = substr( $rank, -1 ); $seclast = substr( $rank, -2, -1 ); if( $last > 3 || $last == 0 ) $ext = 'th'; else if( $last == 3 ) $ext = 'rd'; else if( $last == 2 ) $ext = 'nd'; else $ext = 'st'; if( $last == 1 && $seclast == 1) $ext = 'th'; if( $last == 2 && $seclast == 1) $ext = 'th'; if( $last == 3 && $seclast == 1) $ext = 'th'; return $rank.$ext; } |
