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; $i$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); $part1 = '$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，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=foofoo@bar.com foobarfoobar@foo.com ; //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 $user->email, '
'; }
9. php创建日志缩略名
创建用户友好的日志缩略名。
function create_slug($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; } }
function getcloud( $data = array(), $minfontsize = 12, $maxfontsize = 30 ) { $minimumcount = min( array_values( $data ) ); $maximumcount = max( array_values( $data ) ); $spread = $maximumcount - $minimumcount; $cloudhtml = ''; = array(); $spread == 0 && $spread = 1; foreach( $data as $tag => $count ) { $size = $minfontsize + ( $count - $minimumcount ) * ( $maxfontsize - $minfontsize ) / $spread; [] = '' . htmlspecialchars( stripslashes( $tag ) ) . ''; } return join( \n, ) . \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, $rating) { echo 'md5(%24email).%20%0a'&default='.%24default.'&size='.%24size.'&rating='.%24rating.' width='.$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 $limit if(strlen($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'; }
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 $text; }
20. php调整图像尺寸
创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。
/********************** *@filename - path to the image *@tmpname - temporary path to thumbnail *@xmax - max width *@ymax - max height */ function resize_image($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($_server['http_x_requested_with']) == 'xmlhttprequest'){ //if ajax request then }else{ //something else }
22.关键词高亮
function highlight($sstring, $awords) { if (!is_array ($awords) || emptyempty ($awords) || !is_string ($sstring)) { return false; } $swords = implode ('|', $awords); return preg_replace ('@\b('.$swords.')\b@si', '$1', $sstring); }
23.获取你的feedburner的用户
function get_average_readers($feed_id,$interval = 7){ $today = date('y-m-d', strtotime(now)); $ago = date('y-m-d', strtotime(-.$interval. days)); $feed_url=https://feedburner.google.com/api/awareness/1.0/getfeeddata?uri=.$feed_id.&dates=.$ago.,.$today; $ch = curl_init(); curl_setopt($ch, curlopt_returntransfer, 1); curl_setopt($ch, curlopt_url, $feed_url); $data = curl_exec($ch); curl_close($ch); $xml = new simplexmlelement($data); $fb = $xml->feed->entry['circulation']; $nb = 0; foreach($xml->feed->children() as $circ){ $nb += $circ['circulation']; } return round($nb/$interval); }
24.自动生成密码
function generatepassword($length=9, $strength=0) { $vowels = 'aeuy'; $consonants = 'bdghjmnpqrstvz'; if ($strength >= 1) { $consonants .= 'bdghjlmnpqrstvwxz'; } if ($strength >= 2) { $vowels .= aeuy; } if ($strength >= 4) { $consonants .= '23456789'; } if ($strength >= 8 ) { $vowels .= '@#$%'; } $password = ''; $alt = time() % 2; for ($i = 0; $i $length; $i++) { if ($alt == 1) { $password .= $consonants[(rand() % strlen($consonants))]; $alt = 0; } else { $password .= $vowels[(rand() % strlen($vowels))]; $alt = 1; } } return $password; }
25.压缩多个css文件
header('content-type: text/css'); ob_start(compress); function compress($buffer) { /* remove comments */ $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer); /* remove tabs, spaces, newlines, etc. */ $buffer = str_replace(array(\r\n, \r, \n, \t, ' ', ' ', ' '), '', $buffer); return $buffer; } /* your css files */ include('master.css'); include('typography.css'); include('grid.css'); include('print.css'); include('handheld.css'); ob_end_flush();
26.获取短网址
function gettinyurl($url) { return file_get_contents(http://tinyurl.com/api-create.php?url=.$url); }
27.根据生日计算年龄
function age($date){ $year_diff = ''; $time = strtotime($date); if(false === $time){ return ''; } $date = date('y-m-d', $time); list($year,$month,$day) = explode(-,$date); $year_diff = date(y) – $year; $month_diff = date(m) – $month; $day_diff = date(d) – $day; if ($day_diff $month_diff $year_diff–; return $year_diff; }
28.计算执行时间
//create a variable for start time $time_start = microtime(true); // place your php/html/javascript/css/etc. here //create a variable for end time $time_end = microtime(true); //subtract the two times to get seconds $time = $time_end - $time_start; echo 'script took '.$time.' seconds to execute';
29.php的维护模式
function maintenance($mode = false){ if($mode){ if(basename($_server['script_filename']) != 'maintenance.php'){ header(location: http://example.com/maintenance.php); exit; } }else{ if(basename($_server['script_filename']) == 'maintenance.php'){ header(location: http://example.com/); exit; } } }
30.阻止css样式被缓存
31.为数字增加 st\nd\rd 等
function make_ranked($rank) { $last = substr( $rank, -1 ); $seclast = substr( $rank, -2, -1 ); if( $last > 3 || $last == 0 ) $ext = 'th'; else if( $last == 3 ) $ext = 'rd'; else if( $last == 2 ) $ext = 'nd'; else $ext = 'st'; if( $last == 1 && $seclast == 1) $ext = 'th'; if( $last == 2 && $seclast == 1) $ext = 'th'; if( $last == 3 && $seclast == 1) $ext = 'th'; return $rank.$ext; }