站长交易(http://jy.chinaz.com)友情链接交换 虚拟主机评测+IDC导航=IDC123.COM 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。[table] [tr] /***************@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; $i[/table]2. PHP生成一个随机字符串如果不需要可阅读的字符串,使用此函数替代,即可创建一个随机字符串,作为用户的随机密码等。[table] [tr] /**************@l - length of random string*/function generate_rand($l){  $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";  srand((double)microtime()*1000000);  for($i=0; $i[/table]3. PHP编码电子邮件地址使用此代码,可以将任何电子邮件地址编码为 html 字符实体,以防止被垃圾邮件程序收集。[table] [tr] function encode_email($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 = '';    $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 $encoded;}[/td] [/tr] [/table]4. PHP验证邮件地址电子邮件验证也许是中最常用的网页表单验证,此代码除了验证电子邮件地址,也可以选择检查邮件域所属 DNS 中的 MX 记录,使邮件验证功能更加强大。[table] [tr] function is_valid_email($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, $mxrecords);        }        else            return true;    else        return false;}[/td] [/tr] [/table]5. PHP列出目录内容[table] [tr] function list_files($dir){    if(is_dir($dir))    {        if($handle = opendir($dir))        {            while(($file = readdir($handle)) !== false)            {                if($file != "." && $file != ".." && $file != "Thumbs.db")                {                    echo ''.$file.''."\n";                }            }            closedir($handle);        }    }}[/td] [/tr] [/table]6. PHP销毁目录删除一个目录,包括它的内容。[table] [tr] /******@dir - Directory to destroy*@virtual[optional]- whether a virtual directory*/function destroyDir($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;    }}[/td] [/tr] [/table]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。[table] [tr] $json_string='{"id":1,"name":"foo","email":"foo@foobar.com","interest":["wordpress","php"]} ';$obj=json_decode($json_string);echo $obj->name; //prints fooecho $obj->interest[1]; //prints php [/td] [/tr] [/table]8. PHP解析 XML 数据 [table] [tr] //xml string$xml_string="Foofoo@bar.comFoobarfoobar@foo.com"; //load the xml string using simplexml$xml = simplexml_load_string($xml_string); //loop through the each node of userforeach ($xml->user as $user){//access attributeecho $user['id'], ' ';//subnodes are accessed by -> operatorecho $user->name, ' ';echo $user->email, '';}[/td] [/tr] [/table] 9. PHP创建日志缩略名创建用户友好的日志缩略名。 [table] [tr] function create_slug($string){$slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string);return $slug;}[/td] [/tr] [/table] 10. PHP获取客户端真实 IP 地址该函数将获取用户的真实 IP 地址,即便他使用代理服务器。 [table] [tr] function getRealIpAddr(){    if (!emptyempty($_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 $ip;}[/td] [/tr] [/table] 11. PHP强制性文件下载为用户提供强制性的文件下载功能。 [table] [tr] /*********************@file - path to file*/function force_download($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";}}[/td] [/tr] [/table] 12. PHP创建标签云 [table] [tr] 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[] = ''. htmlspecialchars( stripslashes( $tag ) ) . '';} 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($arr, 12, 36);[/td] [/tr] [/table] 13. PHP寻找两个字符串的相似性PHP 提供了一个极少使用的 similar_text 函数,但此函数非常有用,用于比较两个字符串并返回相似程度的百分比。 [table] [tr] similar_text($string1, $string2, $percent);//$percent will have the percentage of similarity[/td] [/tr] [/table] 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。 [table] [tr] /*******************@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, $rating){echo '';}[/td] [/tr] [/table] 15. PHP在字符断点处截断文字所谓断字 (word break),即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。 [table] [tr] // Original PHP code by Chirp Internet: www.chirp.com.au// Please acknowledge use of this code by including this header.function myTruncate($string, $limit, $break=".", $pad="...") {// return with no change if string is shorter than $limitif(strlen($string) [/table] 16. PHP文件 Zip 压缩 [table] [tr] /* creates a compressed zip file */function create_zip($files = array(),$destination = '',$overwrite = false) {//if the zip file already exists and overwrite is false, return falseif(file_exists($destination) && !$overwrite) { return false; }//vars$valid_files = array();//if files were passed in...if(is_array($files)) {//cycle through each fileforeach($files as $file) {//make sure the file existsif(file_exists($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 filesforeach($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!$zip->close(); //check to make sure the file existsreturn file_exists($destination);}else{return false;}}/***** Example Usage ***/$files=array('file1.jpg', 'file2.jpg', 'file3.gif');create_zip($files, 'myzipfile.zip', true);[/td] [/tr] [/table] 17. PHP解压缩 Zip 文件 [table] [tr] /***********************@file - path to zip file*@destination - destination directory for unzipped files*/function unzip_file($file, $destination){// create object$zip = new ZipArchive() ;// open archiveif ($zip->open($file) !== TRUE) {die (’Could not open archive’);}// extract contents to destination directory$zip->extractTo($destination);// close archive$zip->close();echo 'Archive extracted to directory';}[/td] [/tr] [/table] 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。 [table] [tr] if (!preg_match("/^(http|ftp):/", $_POST['url'])) {   $_POST['url'] = 'http://'.$_POST['url'];}[/td] [/tr] [/table] 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。 [table] [tr] function makeClickableLinks($text) { $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+."#?&//=]+)', '\1', $text); $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+."#?&//=]+)', '\1\2', $text); $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})', '\1', $text); return $text;} [/td] [/tr] [/table] 20. PHP调整图像尺寸创建图像缩略图需要许多时间,此代码将有助于了解缩略图的逻辑。 [table] [tr] /***********************@filename - path to the image*@tmpname - temporary path to thumbnail*@xmax - max width*@ymax - max height*/function resize_image($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 = $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 $im2;}[/td] [/tr] [/table] 21. PHP检测 ajax 请求大多数的 JavaScript 框架如 jquery,Mootools 等,在发出 Ajax 请求时,都会发送额外的 HTTP_X_REQUESTED_WITH 头部信息,头当他们一个ajax请求,因此你可以在服务器端侦测到 Ajax 请求。 [table] [tr] if(!emptyempty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){    //If AJAX Request Then}else{//something else}[/td] [/tr] [/table]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 [b][/b]