21个php常用方法汇总
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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