CorujaFileManipulation.class.php

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<?php
class CorujaFileManipulation
{
    public static function getRelativePath( $strFileFrom, $strFileTo, $booValidPath = true )
    {
        // check for valid parameters

        $strFileFrom = str_replace( "\\" , "/" , $strFileFrom );
        $strFileTo = str_replace( "\\" , "/" , $strFileTo );

        if( $booValidPath
            && ( ! is_dir( $strFileFrom ) || ! is_dir( $strFileTo ) )
        )
        {
            throw new InvalidArgumentException("Invalid parameter: strFileFrom: ".$strFileFrom." strFileTo: ".$strFileTo);
        }

        // special case: equal paths
        if( $strFileFrom == $strFileTo )
        {
             $strReturnPath = './';
        }
        else
        {
            // explode parameters using '/'
            $arrFileFrom = explode( '/', $strFileFrom );
            $arrFileTo   = explode( '/', $strFileTo );

            // remove similar base folders
            while(
                current( $arrFileFrom ) == current( $arrFileTo )
                && count( $arrFileFrom ) > 0
            )
            {
                array_shift( $arrFileFrom );
                array_shift( $arrFileTo );
            }

            $arrReturnPath = array();

            // make final address
            foreach( $arrFileFrom as $strFolder )
            {
                if( $strFolder != "" ) {
                    $arrReturnPath[] = "..";
                }
            }

            foreach( $arrFileTo as $strFolder )
            {
                $arrReturnPath[] = $strFolder;
            }

            $strReturnPath = implode( '/', $arrReturnPath );
        }
        return $strReturnPath;
    }

    public static function isRelativePath( $strFile )
    {
        $strFile = str_replace( "\\", "/", $strFile);
        if(
            ( strpos( $strFile, "./") === 0 )
            or
            ( strpos( $strFile, "../") === 0 )
         )
        {
            return true;
        }
        elseif( strpos( $strFile, "/") === false )
        {
            return true;
        }
        else
        {
            return false;
        }
   }
   
    public static function getPathOfFile( $strFile )
    {
        return str_replace( "\\" , "/" , str_replace( basename( $strFile ) , "" , $strFile ) );
    }
}
?>