二十一段救命的PHP代码
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-lengthofrandomstring(mustbeamultipleof2) **************/ function readable_random_string( $length =6){ $conso
1. PHP可阅读随机字符串
此代码将创建一个可阅读的字符串，使其更接近词典中的单词，实用且具有密码验证功能。
1. /**************
2. *@length - length of random string (must be a multiple of 2)
3. **************/
4. function readable_random_string($length = 6){
5. $conso=array("b","c","d","f","g","h","j","k","l",
6. "m","n","p","r","s","t","v","w","x","y","z");
7. $vocal=array("a","e","i","o","u");
8. $password="";
9. srand ((double)microtime()*1000000);
10. $max = $length/2;
11. for($i=1; $i<=$max; $i++)
12. {
13. $password.=$conso[rand(0,19)];
14. $password.=$vocal[rand(0,4)];
15. }
16. return $password;
17.}
2. PHP生成一个随机字符串
如果不需要可阅读的字符串，使用此函数替代，即可创建一个随机字符串，作为用户的随机密码等。
1. /*************
2. *@l - length of random string
3. */
4. function generate_rand($l){
5. $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
6. srand((double)microtime()*1000000);
7. for($i=0; $i<$l; $i++) {
8. $rand.= $c[rand()%strlen($c)];
9. }
10. return $rand;
11.}
3. PHP编码电子邮件地址
使用此代码，可以将任何电子邮件地址编码为 html 字符实体，以防止被垃圾邮件程序收集。
1. function encode_email($email='[email protected]', $linkText='Contact Us', $attrs ='class="emailencoder"' )
2. {
3. // remplazar aroba y puntos
4. $email = str_replace('@', '@', $email);
5. $email = str_replace('.', '.', $email);
6. $email = str_split($email, 5);
7.
8. $linkText = str_replace('@', '@', $linkText);
9. $linkText = str_replace('.', '.', $linkText);
10. $linkText = str_split($linkText, 5);
11.
12. $part1 = '<a href="ma';
13. $part2 = 'ilto:';
14. $part3 = '" '. $attrs .' >';
15. $part4 = '</a>';
16.
17. $encoded = '<script type="text/javascript">';
18. $encoded .= "document.write('$part1');";
19. $encoded .= "document.write('$part2');";
20. foreach($email as $e)
21. {
22. $encoded .= "document.write('$e');";
23. }
24. $encoded .= "document.write('$part3');";
25. foreach($linkText as $l)
26. {
27. $encoded .= "document.write('$l');";
28. }
29. $encoded .= "document.write('$part4');";
30. $encoded .= '</script>';
31.
32. return $encoded;
33.}
4. PHP验证邮件地址
电子邮件验证也许是中最常用的网页表单验证，此代码除了验证电子邮件地址，也可以选择检查邮件域所属 DNS 中的 MX 记录，使邮件验证功能更加强大。
1. function is_valid_email($email, $test_mx = false)
2. {
3. if(eregi("^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email))
4. if($test_mx)
5. {
6. list($username, $domain) = split("@", $email);
7. return getmxrr($domain, $mxrecords);
8. }
9. else
10. return true;
11. else
12. return false;
13.}
5. PHP列出目录内容
1. function list_files($dir)
2. {
3. if(is_dir($dir))
4. {
5. if($handle = opendir($dir))
6. {
7. while(($file = readdir($handle)) !== false)
8. {
9. if($file != "." && $file != ".." && $file != "Thumbs.db")
10. {
11. echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
12. }
13. }
14. closedir($handle);
15. }
16. }
17.}
6. PHP销毁目录
删除一个目录，包括它的内容。
1. /*****
2. *@dir - Directory to destroy
3. *@virtual[optional]- whether a virtual directory
4. */
5. function destroyDir($dir, $virtual = false)
6. {
7. $ds = DIRECTORY_SEPARATOR;
8. $dir = $virtual ? realpath($dir) : $dir;
9. $dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir;
10. if (is_dir($dir) && $handle = opendir($dir))
11. {
12. while ($file = readdir($handle))
13. {
14. if ($file == '.' || $file == '..')
15. {
16. continue;
17. }
18. elseif (is_dir($dir.$ds.$file))
19. {
20. destroyDir($dir.$ds.$file);
21. }
22. else
23. {
24. unlink($dir.$ds.$file);
25. }
26. }
27. closedir($handle);
28. rmdir($dir);
29. return true;
30. }
31. else
32. {
33. return false;
34. }
35.}
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。
1. $json_string='{"id":1,"name":"foo","email":"[email protected]","interest":["wordpress","php"]} ';
2. $obj=json_decode($json_string);
3. echo $obj->name; //prints foo
4. echo $obj->interest[1]; //prints php
8. PHP解析 XML 数据
1. //xml string
2. $xml_string="<?xml version='1.0'?>
3. <users>
4. <user id='398'>
5. <name>Foo</name>
6. <email>[email protected]</name>
7. </user>
8. <user id='867'>
9. <name>Foobar</name>
10.<email>[email protected]</name>
11.</user>
12.</users>";
13.
14.//load the xml string using simplexml
15.$xml = simplexml_load_string($xml_string);
16.
17.//loop through the each node of user
18.foreach ($xml->user as $user)
19.{
20.//access attribute
21.echo $user['id'], ' ';
22.//subnodes are accessed by -> operator
23.echo $user->name, ' ';
24.echo $user->email, '<br />';
25.}
9. PHP创建日志缩略名
创建用户友好的日志缩略名。
1. function create_slug($string){
2. $slug=preg_replace('/[^A-Za-z0-9-]+/', '-', $string);
3. return $slug;
4. }
10. PHP获取客户端真实 IP 地址
该函数将获取用户的真实 IP 地址，即便他使用代理服务器。
1. function getRealIpAddr()
2. {
3. if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))
4. {
5. $ip=$_SERVER['HTTP_CLIENT_IP'];
6. }
7. elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))
8. //to check ip is pass from proxy
9. {
10. $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
11. }
12. else
13. {
14. $ip=$_SERVER['REMOTE_ADDR'];
15. }
16. return $ip;
17.}
11. PHP强制性文件下载
为用户提供强制性的文件下载功能。
1. /********************
2. *@file - path to file
3. */
4. function force_download($file)
5. {
6. if ((isset($file))&&(file_exists($file))) {
7. header("Content-length: ".filesize($file));
8. header('Content-Type: application/octet-stream');
9. header('Content-Disposition: attachment; filename="' . $file . '"');
10.readfile("$file");
11.} else {
12.echo "No file selected";
13.}
14.}
12. PHP创建标签云
1. function getCloud( $data = array(), $minFontSize = 12, $maxFontSize = 30 )
2. {
3. $minimumCount = min( array_values( $data ) );
4. $maximumCount = max( array_values( $data ) );
5. $spread = $maximumCount - $minimumCount;
6. $cloudHTML = '';
7. $cloudTags = array();
8.
9. $spread == 0 && $spread = 1;
10.
11.foreach( $data as $tag => $count )
12.{
13.$size = $minFontSize + ( $count - $minimumCount )
14.* ( $maxFontSize - $minFontSize ) / $spread;
15.$cloudTags[] = '<a style="font-size: ' . floor( $size ) . 'px'
16.. '" href="#" title="\'' . $tag .
17.'\' returned a count of ' . $count . '">'
18.. htmlspecialchars( stripslashes( $tag ) ) . '</a>';
19.}
20.
21.return join( "\n", $cloudTags ) . "\n";
22.}
23./**************************
24.**** Sample usage ***/
25.$arr = Array('Actionscript' => 35, 'Adobe' => 22, 'Array' => 44, 'Background' => 43,
26.'Blur' => 18, 'Canvas' => 33, 'Class' => 15, 'Color Palette' => 11, 'Crop' => 42,
27.'Delimiter' => 13, 'Depth' => 34, 'Design' => 8, 'Encode' => 12, 'Encryption' => 30,
28.'Extract' => 28, 'Filters' => 42);
29.echo getCloud($arr, 12, 36);
13. PHP寻找两个字符串的相似性
PHP 提供了一个极少使用的 similar_text 函数，但此函数非常有用，用于比较两个字符串并返回相似程度的百分比。
1. similar_text($string1, $string2, $percent);
2. //$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。
1. /******************
2. *@email - Email address to show gravatar for
3. *@size - size of gravatar
4. *@default - URL of default gravatar to use
5. *@rating - rating of Gravatar(G, PG, R, X)
6. */
7. function show_gravatar($email, $size, $default, $rating)
8. {
9. echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email).
10.'&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px"
11.height="'.$size.'px" />';
12.}
15. PHP在字符断点处截断文字
所谓断字 (word break)，即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。
1. // Original PHP code by Chirp Internet: www.chirp.com.au
2. // Please acknowledge use of this code by including this header.
3. function myTruncate($string, $limit, $break=".", $pad="...") {
4. // return with no change if string is shorter than $limit
5. if(strlen($string) <= $limit)
6. return $string;
7.
8. // is $break present between $limit and the end of the string?
9. if(false !== ($breakpoint = strpos($string, $break, $limit))) {
10.if($breakpoint < strlen($string) - 1) {
11.$string = substr($string, 0, $breakpoint) . $pad;
12.}
13.}
14.return $string;
15.}
16./***** Example ****/
17.$short_string=myTruncate($long_string, 100, ' ');
16. PHP文件 Zip 压缩
1. /* creates a compressed zip file */
2. function create_zip($files = array(),$destination = '',$overwrite = false) {
3. //if the zip file already exists and overwrite is false, return false
4. if(file_exists($destination) && !$overwrite) { return false; }
5. //vars
6. $valid_files = array();
7. //if files were passed in...
8. if(is_array($files)) {
9. //cycle through each file
10.foreach($files as $file) {
11.//make sure the file exists
12.if(file_exists($file)) {
13.$valid_files[] = $file;
14.}
15.}
16.}
17.//if we have good files...
18.if(count($valid_files)) {
19.//create the archive
20.$zip = new ZipArchive();
21.if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
22.return false;
23.}
24.//add the files
25.foreach($valid_files as $file) {
26.$zip->addFile($file,$file);
27.}
28.//debug
29.//echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status;
30.
31.//close the zip -- done!
32.$zip->close();
33.
34.//check to make sure the file exists
35.return file_exists($destination);
36.}
37.else
38.{
39.return false;
40.}
41.}
42./***** Example Usage ***/
43.$files=array('file1.jpg', 'file2.jpg', 'file3.gif');
44.create_zip($files, 'myzipfile.zip', true);
17. PHP解压缩 Zip 文件
1. /**********************
2. *@file - path to zip file
3. *@destination - destination directory for unzipped files
4. */
5. function unzip_file($file, $destination){
6. // create object
7. $zip = new ZipArchive() ;
8. // open archive
9. if ($zip->open($file) !== TRUE) {
10.die (’Could not open archive’);
11.}
12.// extract contents to destination directory
13.$zip->extractTo($destination);
14.// close archive
15.$zip->close();
16.echo 'Archive extracted to directory';
17.}
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。
1. if (!preg_match("/^(http|ftp):/", $_POST['url'])) {
2. $_POST['url'] = 'http://'.$_POST['url'];
3. }
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。
1. function makeClickableLinks($text) {
2. $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',
3. '<a href="\1">\1</a>', $text);
4. $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',
5. '\1<a href="http://\2">\2</a>', $text);
6. $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',
7. '<a href="mailto:\1">\1</a>', $text);
8.
9. return $text;
10.}
20. PHP调整图像尺寸
创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。
1. /**********************
2. *@filename - path to the image
3. *@tmpname - temporary path to thumbnail
4. *@xmax - max width
5. *@ymax - max height
6. */
7. function resize_image($filename, $tmpname, $xmax, $ymax)
8. {
9. $ext = explode(".", $filename);
10. $ext = $ext[count($ext)-1];
11.
12. if($ext == "jpg" || $ext == "jpeg")
13. $im = imagecreatefromjpeg($tmpname);
14. elseif($ext == "png")
15. $im = imagecreatefrompng($tmpname);
16. elseif($ext == "gif")
17. $im = imagecreatefromgif($tmpname);
18.
19. $x = imagesx($im);
20. $y = imagesy($im);
21.
22. if($x <= $xmax && $y <= $ymax)
23. return $im;
24.
25. if($x >= $y) {
26. $newx = $xmax;
27. $newy = $newx * $y / $x;
28. }
29. else {
30. $newy = $ymax;
31. $newx = $x / $y * $newy;
32. }
33.
34. $im2 = imagecreatetruecolor($newx, $newy);
35. imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
36. return $im2;
37.}
21. PHP检测 ajax 请求
大多数的 JavaScript 框架如 jquery，Mootools 等，在发出 Ajax 请求时，都会发送额外的 HTTP_X_REQUESTED_WITH 头部信息，头当他们一个ajax请求，因此你可以在服务器端侦测到 Ajax 请求。
1. if(!emptyempty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){
2. //If AJAX Request Then
3. }else{
4. //something else
5. }
关键词高亮
1. function highlight($sString, $aWords) {
2. if (!is_array ($aWords) || emptyempty ($aWords) || !is_string ($sString)) {
3. return false;
4. }
5.
6. $sWords = implode ('|', $aWords);
7. return preg_replace ('@\b('.$sWords.')\b@si', '<strong style="background-color:yellow">$1</strong>', $sString);
8. }
function highLight($str, $keywords, $color = "red") {
if (empty($keywords)) {
return $str;
}
$keywords = split("[ \t\r\n,]+", $keywords);
foreach($keywords as $val) {
$tvar = eregi($val, $str, $regs);
$finalrep = "<font color=". $color . ">" . $regs[0] . "</font>";
}
$str = str_ireplace($regs[0], $finalrep, $str);
return $str;
}
获取你的Feedburner的用户
1. function get_average_readers($feed_id,$interval = 7){
2. $today = date('Y-m-d', strtotime("now"));
3. $ago = date('Y-m-d', strtotime("-".$interval." days"));
4. $feed_url="https://feedburner.google.com/api/awareness/1.0/GetFeedData?uri=".$feed_id."&dates=".$ago.",".$today;
5. $ch = curl_init();
6. curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
7. curl_setopt($ch, CURLOPT_URL, $feed_url);
8. $data = curl_exec($ch);
9. curl_close($ch);
10. $xml = new SimpleXMLElement($data);
11. $fb = $xml->feed->entry['circulation'];
12.
13. $nb = 0;
14. foreach($xml->feed->children() as $circ){
15. $nb += $circ['circulation'];
16. }
17.
18. return round($nb/$interval);
19.}
自动生成密码
1. function generatePassword($length=9, $strength=0) {
2. $vowels = 'aeuy';
3. $consonants = 'bdghjmnpqrstvz';
4. if ($strength >= 1) {
5. $consonants .= 'BDGHJLMNPQRSTVWXZ';
6. }
7. if ($strength >= 2) {
8. $vowels .= "AEUY";
9. }
10. if ($strength >= 4) {
11. $consonants .= '23456789';
12. }
13. if ($strength >= 8 ) {
14. $vowels .= '@#$%';
15. }
16.
17. $password = '';
18. $alt = time() % 2;
19. for ($i = 0; $i < $length; $i++) {
20. if ($alt == 1) {
21. $password .= $consonants[(rand() % strlen($consonants))];
22. $alt = 0;
23. } else {
24. $password .= $vowels[(rand() % strlen($vowels))];
25. $alt = 1;
26. }
27. }
28. return $password;
29.}
压缩多个CSS文件
1. header('Content-type: text/css');
2. ob_start("compress");
3. function compress($buffer) {
4. /* remove comments */
5. $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
6. /* remove tabs, spaces, newlines, etc. */
7. $buffer = str_replace(array("\r\n", "\r", "\n", "\t", ' ', ' ', ' '), '', $buffer);
8. return $buffer;
9. }
10.
11./* your css files */
12.include('master.css');
13.include('typography.css');
14.include('grid.css');
15.include('print.css');
16.include('handheld.css');
17.
18.ob_end_flush();
获取短网址
1. function getTinyUrl($url) {
2. return file_get_contents("http://tinyurl.com/api-create.php?url=".$url);
3. }
根据生日计算年龄
1. function age($date){
2. $year_diff = '';
3. $time = strtotime($date);
4. if(FALSE === $time){
5. return '';
6. }
7.
8. $date = date('Y-m-d', $time);
9. list($year,$month,$day) = explode("-",$date);
10. $year_diff = date("Y") – $year;
11. $month_diff = date("m") – $month;
12. $day_diff = date("d") – $day;
13. if ($day_diff < 0 || $month_diff < 0) $year_diff–;
14.
15. return $year_diff;
16.}
计算执行时间
1. //Create a variable for start time
2. $time_start = microtime(true);
3.
4. // Place your PHP/HTML/JavaScript/CSS/Etc. Here
5.
6. //Create a variable for end time
7. $time_end = microtime(true);
8. //Subtract the two times to get seconds
9. $time = $time_end - $time_start;
10.
11.echo 'Script took '.$time.' seconds to execute';
PHP的维护模式
1. function maintenance($mode = FALSE){
2. if($mode){
3. if(basename($_SERVER['SCRIPT_FILENAME']) != 'maintenance.php'){
4. header("Location: http://example.com/maintenance.php");
5. exit;
6. }
7. }else{
8. if(basename($_SERVER['SCRIPT_FILENAME']) == 'maintenance.php'){
9. header("Location: http://example.com/");
10. exit;
11. }
12. }
13.}
阻止CSS样式被缓存
1. <link href="/stylesheet.css?<?php echo time(); ?>" rel="stylesheet" type="text/css" /&glt;
为数字增加 st\nd\rd 等
1. function make_ranked($rank) {
2. $last = substr( $rank, -1 );
3. $seclast = substr( $rank, -2, -1 );
4. if( $last > 3 || $last == 0 ) $ext = 'th';
5. else if( $last == 3 ) $ext = 'rd';
6. else if( $last == 2 ) $ext = 'nd';
7. else $ext = 'st';
8.
9. if( $last == 1 && $seclast == 1) $ext = 'th';
10. if( $last == 2 && $seclast == 1) $ext = 'th';
11. if( $last == 3 && $seclast == 1) $ext = 'th';
12.
13. return $rank.$ext;
14.}