php script does not swap in error 403 message data.

<?php

function e403_handler()
{
    global $nen;

    $nen[ 'e403' ] = $nen[ 'root' ] . 'e403/';

    $nen[ 'pagedata' ] = file_get_contents( $nen[ 'e403' ] . 'e403.html' );

    $e403msg = file_get_contents( $nen[ 'e403' ] . 'e403msg.txt' );

    str_replace('{{e403msg}}',$e403msg,$nen[ 'pagedata' ]);

    $e403vid = file_get_contents( $nen[ 'e403' ] . 'e403vid.txt' );

    str_replace('{{e403vid}}',$e403vid,$nen[ 'pagedata' ]);

    echo $nen[ 'pagedata' ];

    exit;
}

?>
(edited)

Message #📃│js