The principle that PHP automatically generates thumbnails based on URLs

Principle: Set Apache rewrite, when the picture does not exist, invoke PHP to create a picture.

For example

The original path is: http://localhost/upload/news/2013/07/21/1.jpg

The thumbnail path is: http://localhost/supload/news/2013/07/21/1.jpg

Displays a picture when you access http://localhost/supload/news/2013/07/21/1.jpg, such as when a picture exists. Otherwise, call createthumb.php to generate the picture.

The directory structure is as follows:

www/picthumb.class.php

www/thumbconfig.php

Www/upload/news/2013/07/21/1.jpg

Www/upload/article/2013/07/21/2.jpg

Www/supload/.htaccess

Www/supload/watermark.png

www/supload/createthumb.php

http://localhost/point to www directory

PicThumb.class.php usage Please check here : http://blog.csdn.net/fdipzone/article/details/9316385

Need to turn on Apache rewrite

sudo a2enmod rewrite

. htaccess

<ifmodule mod_rewrite.c>  
rewriteengine  
      
on # ' s ' (is regular file, with size)  
# '-l ' (is symbolic link) c4/># '-d ' (is directory)  
# ' ornext| or ' (or Next condition)  
# ' nocase| NC ' (no case)  
# ' last| L ' (last rule)  
      
Rewritecond%{request_filename}-S [or]  
rewritecond%{request_filename}-l [or]  
Rewritecond%{request_filename}  
-D rewriterule ^.*$-[nc,l] rewriterule ^.*$-createthumb.php?path=%{  
Request_uri} [nc,l]  
      
</IfModule>

createthumb.php

<?php define (' Www_path ', DirName (dirname (__file__))); Site WWW directory require (Www_path. ' /picthumb.class.php '); Include PicThumb.class.php require (Www_path. '    /thumbconfig.php '); Include thumbconfig.php $logfile = Www_path. '  /createthumb.log '; Log file $source _path = Www_path. '      /upload/'; The original path $dest _path = Www_path. '       /supload/'; Target path $path = isset ($_get[' path ')?  $_get[' path ']: ';  
Access to the picture URL//check path if (! $path) {exit ();  
      
//Get picture uri $relative _url = str_replace ($dest _path, ", Www_path. $path);  
      
Gets the type $type = substr ($relative _url, 0, Strpos ($relative _url, '/')); Get config $config = isset ($thumb _config[$type])?  
      
$thumb _config[$type]: ';  
Check config if (! $config | | |!isset ($config [' Fromdir '])) {exit (); }//Original file $source = Str_replace ('/'. $type. /', '/'. $config [' Fromdir ']. '  
      
/', $source _path. $relative _url); Target file $dest = $dest _path. $relaTive_url;  
Create thumbnails $obj = new Picthumb ($logfile);  
$obj->set_config ($config);  
    if ($obj->create_thumb ($source, $dest)) {Ob_clean ();  
    Header (' Content-type: ' Mime_content_type ($dest));  
Exit (file_get_contents ($dest)); }?>

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/webkf/PHP/