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>"." "; } } 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( " ", $cloudTags ) . " "; } /************************** **** 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 similarity |
14. 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。
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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 } |
英文原稿:21 Really Useful & Handy PHP Code Snippets | Web Developer Plus
翻译整理:21+ 实用便捷的 PHP 代码摘录 | 芒果