PHP implementation method of automatically generating thumbnails based on URL

This article describes the PHP implementation based on the URL automatically generated thumbnails of the method, is a very practical function. Share to everyone for your reference. The specific methods are as follows:

　　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

　　Need to turn on Apache rewrite:

sudo a2enmod rewrite

　　The . htaccess file is as follows:

<ifmodule mod_rewrite.c>

Rewriteengine on

# ' s ' (is regular file, with size)

# '-l ' (is symbolic link)

# '-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 files are as follows:

<?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 files

$source _path = Www_path. ' /upload/'; 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);

Get 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 artwork File

$source = Str_replace ('/'. $type. /', '/'. $config [' Fromdir ']. ' /', $source _path. $relative _url);

Destination 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));

}

?>

thumbconfig.php files are as follows:

<?php

$thumb _config = Array (

' News ' => Array (

' Fromdir ' => ' news ',//source directory

' Type ' => ' fit ',

' Width ' => 100,

' Height ' => 100,

' bgcolor ' => ' #FF0000 '

),

' News_1 ' => Array (

' Fromdir ' => ' news ',

' Type ' => ' fit ',

' Width ' => 200,

' Height ' => 200,

' bgcolor ' => ' #FFFF00 '

),

' article ' => Array (

' Fromdir ' => ' article ',

' type ' => ' crop ',

' Width ' => 250,

' Height ' => 250,

' Watermark ' => www_path. ' /supload/watermark.png '

)

);

?>

After accessing these three paths, the thumbnails are automatically generated by config

Http://localhost/supload/news/2013/07/21/1.jpg

Http://localhost/supload/news_1/2013/07/21/1.jpg

Http://localhost/supload/article/2013/07/21/2.jpg

I hope this article will help you with your PHP program design.