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1. PHP can read random strings
This code will create a readable string that is closer to the word in the dictionary, practical, and has password verification capabilities.
/**************
*@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 $password;
}
2. PHP generates a random string
If a readable string is not required, use this function instead to create a random string that can be used as a random password for the user, etc.
/*************
*@l - length of random string
*/
function generate_rand($l){
$c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
srand((double)microtime()*1000000);
for($i=0; $i<$l; $i++) {
$rand.= $c[rand()%strlen($c)];
}
return $rand;
}
3. PHP encoded email address
Using this code, any email address can be encoded as an html character entity to prevent collection by spam programs.
function encode_email($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 = ’’;
$encoded .= "document.write(’$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 .= ’’;
Return $encoded;
}
4. PHP verification email address
Email verification is perhaps the most commonly used web form verification in China. In addition to verifying the email address, this code can also choose to check the MX record in the DNS to which the email domain belongs, making the email verification function more powerful.
function is_valid_email($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, $mxrecords);
}
else
return true;
else
return false;
}
5. PHP lists directory contents
function list_files($dir)
{
If(is_dir($dir))
{
If($handle = opendir($dir))
{
while(($file = readdir($handle)) !== false)
If($file != "." && $file != ".." && $file != "Thumbs.db")
echo ’’.$file.’
’."n";
closedir($handle);
}
}
}
6. PHP destroy directory
Delete a directory, including its contents.
/*****
*@dir - Directory to destroy
*@virtual[optional]- whether a virtual directory
*/
function destroyDir($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="
Foo
foo@bar.com
Foobar
foobar@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 $user->email, ’’;
}
9. PHP creates log abbreviation
Create user-friendly log abbreviations.
function create_slug($string){
$slug=preg_replace(’/[^A-Za-z0-9-]+/’, ’-’, $string);
return $slug;
}
10. PHP gets the real IP address of the client
This function will get the user's real IP address, even if he uses a proxy server.
function getRealIpAddr()
{
If (!emptyempty($_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 $ip;
}
11. PHP mandatory file download
Provide users with mandatory file download functionality.
/********************
*@file - path to file
*/
function force_download($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. 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[] = ’
. ’" href="#" title="’’ . $tag .
’’ returned a count of ’ . $count . ’">’
. htmlspecialchars( stripslashes( $tag ) ) . ’’;
}
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, $rating)
{
echo ’
’&default=’.$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 defaults http string for URL address
Sometimes it is necessary to accept URL input in some forms, but users rarely add the http:// field, this code will add that field to the URL.
if (!preg_match("/^(http|ftp):/", $_POST[’url’])) {
$_POST[’url’] = ’http://’.$_POST[’url’];
}
19. PHP converts URL string into hyperlink
This function converts URL and email address strings into clickable hyperlinks.
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@:%_+.~#?&//=]+)', '12', $ text); $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3} )', '1', $text); return $text;}
20. PHP adjust image size
Creating image thumbnails takes a lot of time, this code will help to understand the logic of thumbnails.
/**********************
*@filename - path to the image
*@tmpname - temporary path to thumbnail
*@xmax - max width
*@ymax - max height
*/
function resize_image($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 $im2;
}
21. PHP detects ajax request
Most JavaScript frameworks such as jquery, Mootools, etc., when making Ajax requests, will send additional HTTP_X_REQUESTED_WITH header information, treating them as an ajax request, so you can detect Ajax requests on the server side.
if(!emptyempty($_SERVER[’HTTP_X_REQUESTED_WITH’]) && strtolower($_SERVER[’HTTP_X_REQUESTED_WITH’]) == ’xmlhttprequest’){
//If AJAX Request Then
}else{
//something else
}
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