Loading... ### 1. 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。 ```php <?php /** * @param 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. 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。 ```php <?php /** *@param $l - length of random string */ function generate_rand($l) { $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; srand((double)microtime()*1000000); for ($i=0; $i<$l; $i++) { $rand.= $c[rand()%strlen($c)]; } return $rand; } ?> ``` ### 3. 编码电子邮件地址 使用此代码,可以将任何电子邮件地址编码为 HTML 字符实体,以防止被垃圾邮件程序收集。 ```php <?php function encode_email($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 $encoded; } ?> ``` ### 4. 验证邮件地址 电子邮件验证也许是中最常用的网页表单验证,此代码除了验证电子邮件地址,也可以选择检查邮件域所属 DNS 中的 MX 记录,使邮件验证功能更加强大。 ```php <?php function is_valid_email($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, $mxrecords); } else { return TRUE; } } else { return FALSE; } } ?> ``` ### 5. 列出目录内容 ```php <?php function list_files($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. 删除目录 删除一个目录,包括它的内容。 ```php <?php /** *@param $dir - Directory to destroy *@param $virtual[optional]- whether a virtual directory */ function destroyDir($dir, $virtual = FALSE) { $ds = DIRECTORY_SEPARATOR; $dir = $virtual ? realpath($dir) : $dir; $dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir; // 去掉尾部的文件夹分隔符 if (is_dir($dir) && $handle = opendir($dir)) { while ($file = readdir($handle)) { if ($file == '.' || $file == '..') { continue; } else if (is_dir($dir . $ds . $file)) { destroyDir($dir . $ds . $file); } else { unlink($dir . $ds . $file); } } closedir($handle); rmdir($dir); return TRUE; } else { return FALSE; } } ?> ``` ### 7. 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。 ```php <?php $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. 解析 XML 数据 ```php <?php //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 $user->email, '<br />'; } ?> ``` ### 9. 创建日志缩略名 创建用户友好的日志缩略名。 ```php <?php function create_slug($string) { $slug = preg_replace('/[^A-Za-z0-9-]+/', '-', $string); return $slug; } ?> ``` ### 10. 获取客户端真实 IP 地址 该函数将获取用户的真实 IP 地址,即便他使用代理服务器。 ```php <?php function getRealIpAddr() { if (!emptyempty($_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. 强制性文件下载 为用户提供强制性的文件下载功能。 ```php <?php /** *@param $file - path to file */ function force_download($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. 创建标签云 ```php <?php 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 && $spread = 1; // 假如等于0,则强制为1 foreach ($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. 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。 ```php <?php similar_text($string1, $string2, $percent); //$percent will have the percentage of similarity ?> ``` ### 14. 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。 ```php <?php /** * @param $email - Email address to show gravatar for * @param $size - size of gravatar * @param $default - URL of default gravatar to use * @param $rating - rating of Gravatar(G, PG, R, X) */ function show_gravatar($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="' . $size . 'px" />'; } ?> ``` ### 15. 在字符断点处截断文字 所谓断字 (word break),即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。 ```php <?php // Original PHP code by Chirp Internet: www.chirp.com.au // Please acknowledge use of this code by including this header. function myTruncate($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. 文件 Zip 压缩 ```php <?php /* 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. 解压缩 Zip 文件 ```php <?php /** * @param $file - path to zip file * @parm $destination - destination directory for unzipped files */ function unzip_file($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. 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。 ```php <?php if (!preg_match("/^(http|ftp):/", $_POST['url'])) { $_POST['url'] = 'http://' . $_POST['url']; } ?> ``` ### 19. 将网址字符串转换成超级链接 该函数将 URL 和 E-mail 地址字符串转换为可点击的超级链接。 ```php <?php function makeClickableLinks($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<span class="external-link"><a class="no-external-link" href="http://2" target="_blank"><i data-feather="external-link"></i>2</a></span>', $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. 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。 ```php <?php /** * @param $filename - path to the image * @param $tmpname - temporary path to thumbnail * @parm $xmax - max width * @param $ymax - max height */ function resize_image($filename, $tmpname, $xmax, $ymax) { $ext = explode(".", $filename); $ext = $ext[count($ext)-1]; if ($ext == "jpg" || $ext == "jpeg") { $im = imagecreatefromjpeg($tmpname); } else if ($ext == "png") { $im = imagecreatefrompng($tmpname); } else if ($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 $im2; } ?> ``` ### 21. 检测 Ajax 请求 大多数的 JavaScript 框架如 jQuery,Mootools 等,在发出 Ajax 请求时,都会发送额外的 HTTP_X_REQUESTED_WITH 头部信息,头当他们一个ajax请求,因此你可以在服务器端侦测到 Ajax 请求。 ```php <?php if (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){ //If AJAX Request Then } else { //something else } ?> ``` 最后修改:2023 年 03 月 11 日 © 允许规范转载 打赏 赞赏作者 支付宝微信 赞 如果觉得我的文章对你有用,请随意赞赏