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PHPInclusion WordPress plugin allows you (admin only) to insert the content of a php file into your post/page with include(), require() , require_once() and include_once() functions.

Usage :

Copy & Past this code into your post or page :

[include:Path to your php file]

[include_once:Path to your php file]

[require:Path to your php file]

[require_once:Path to your php file]

Examples:

[include:MyPhpFile.php]

[include:MyDir/MyPhpFile.php]

More About PHPInclusion Plugin :

http://www.royakhosravi.com/?p=63