1. PHP可阅读随机字符串

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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 = ' part2 = 'ilto:'; $part3 = '" '. $attrs .' >';
 - $part4 = '';
 - $encoded = ' ' ;
 - $encoded .= "document.write('$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 .= ''; 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;
 - }
 
#p#
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 != ".." && $file != "Thumbs.db")
 - { echo ''.$file.' a>
 
'."\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'?>
 Foo name> foo@bar.com name> - user>
 Foobar name> 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, '
 
';- }
 
#p#
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 )
 - {
 - $minminimumCount = min( array_values( $data ) );
 - $maxmaximumCount = 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[] = '
 - . '" 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 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, $rating)
 - {
 - echo '
 ![]()
- '&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px"
 - height="'.$size.'px" />';
 - }
 
#p#
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';
 - }
 
#p#
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@:%_+.~#?&//=]+)',
 - '\1 a>', $text);
 - $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',
 - '\1\2 a>', $text);
 - $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',
 - '\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
 - }
 
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