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21个php常用方法汇总

时间2024-02-02 10:43:03发布访客分类PHP浏览854
导读:收集整理的这篇文章主要介绍了21个php常用方法汇总,觉得挺不错的,现在分享给大家,也给大家做个参考。php常用方法汇总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。 /*...
收集整理的这篇文章主要介绍了21个php常用方法汇总,觉得挺不错的,现在分享给大家,也给大家做个参考。

php常用方法汇总

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 = '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. 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 != ".." &
    &
 $file != "Thumbs.db") {
     echo 'a target="_blank" href="'.$dir.$file.'">
    '.$file.'/a>
    br>
    '."\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="?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. 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/@R_777_1409@-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[] = 'a style="font-Size: ' . floor( $size ) . 'px' . '" href="#" title="\'' . $tag . '\' returned a count of ' . $count . '">
    ' . htmlspecialchars( stripslashes( $tag ) ) . '/a>
    ';
 }
     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, $rating) {
     echo 'img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email). '&
    default='.$default.'&
    size='.$size.'&
    rating='.$rating.'" width="'.$size.'px" height="'.$size.'px" />
    ';
 }
    

  15. 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@:%_+.~#?&
    //=]+)', 'a href="\1">
    \1/a>
    ', $text);
 $text = eregi_replace('([[:space:]()[{
}
    ])(www.[-a-zA-Z0-9@:%_+.~#?&
    //=]+)', '\1a href="http://\2">
    \2/a>
    ', $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. 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 }
    

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