argvParser, PHP getopt Alternative

<?php
if ( ! class_exists( "Fun" ) ){ class Fun {
function argvParser( $argv, $fnr = array(), $key = "" ){
    $params = array();
    foreach ( $argv as $v ){
        $eq = false;
        if ( preg_match( "/^--([a-z0-9A-Z\-_]*)(\[\])?(\=)?(.*)/", $v, $m ) ){
            $key = $m[2].$m[1];
            $v = $m[4];
            $eq = $m[3];
        } elseif ( preg_match( "/^-([a-z0-9A-Z\-_])/", $v, $m ) ){
            $key = @$fnr[ $m[1] ] ?: $m[0];
        }
        if ( @$key ){
            if ( substr( $key, 0, 2 ) == "[]" ){
                $baseKey = substr( $key, 2 );
                if ( ! isset( $param[ $baseKey ] ) && ! $eq )
                    $params[ $baseKey ] = array();
                else
                    $params[ $baseKey ][] = $v;
            } else
                $params[ $key ] = $v;
        } else
            $params[] = $v;
    }
    return $params;
}
} }
/*
Usage
$ test.php --var aaa --var2=bbb --var3 --arr[] ccc ddd -f eee
<?php
Fun::argvParser( $argv, ['f'=>"var4"] );
return [0=>"test.php", 'var'=>"aaa", 'var2'=>"bbb", 'var3'=>"", 'arr'=>[0=>"ccc", 1=>"ddd"], 'var4'=>"eee"]
*/