二十一个实用便利的PHP代码摘录_PHP

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 { $password.=$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 $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='[email protected]', $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 = ''; 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 != ".." && $file != "Thumbs.db") { echo ''.$file.''."\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， $json_string='{"id":1,"name":"foo","email":"[email protected]","interest":["wordpress","php"]} ';$obj=json_decode($json_string);echo $obj->name; //prints fooecho $obj->interest[1]; //prints php 8. PHP解析 //$"; //load the $//loop through the each node of userforeach ($user as $user){//access attributeecho $user['id'], ' ';//subnodes are accessed by -> operatorecho $user->name, ' ';echo $user->email, '';} 9. PHP创建日志缩略名创建用户友好的日志缩略名。 function create_slug($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[] = '. '" href="#" title="\'' . $tag .'\' returned a count of ' . $count . '">'. 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($arr, 12, 36); 13. PHP寻找两个字符串的相似性PHP 提供了一个极少使用的 similar_text 函数，但此函数非常有用，用于比较两个字符串并返回相似程度的百分比。 similar_text($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" />';} 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 $limitif(strlen($string) return $string; // is $break present between $limit and the end of the string?if(false !== ($breakpoint = strpos($string, $break, $limit))) {if($breakpoint $string = substr($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 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); 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 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';} 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', $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 $text;}登录后复制 20. PHP调整图像尺寸创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。 /***********************@filename - path to the image*@tmpname - temporary path to thumbnail*@xmax - max width*@ymax - max height*/function resize_image($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 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']) == ' //If AJAX Request Then}else{//something else} 英文原稿：21 Really Useful & Handy PHP Code Snippets | Web Developer Plus