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Get Extension of Any File.
by amr.mekkawy

This function gets extension of any file.

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# This function gets extension of any file.
function get_extension( $file_name ) {
    # first get extension of the file including the dot that precedes it
    $extension_with_preceding_dot = strrchr( $file_name, "." );
    # second get the extension alone ( without the preceding dot )
    $extension = substr( $extension_with_preceding_dot, 1 );
    # and finally.. return the extension
    return $extension;


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