function strToHex( $string )
{
    $hex='';

    for ( $i=0; $i < strlen( $string ); $i++ )
    {
        $hex .= dechex( ord( $string[$i] ) );
    }

    return $hex;
}

function endian_swap_uint( &$x )
{
    $x = ( $x>>24 ) |
        ( ( $x << 8 ) & 0x00FF0000 ) |
        ( ( $x >> 8 ) & 0x0000FF00 ) |
        ( $x << 24 );
}

endian_swap_uint( strToHex( fread( $filePointer, 4 ) ) );

/*

strToHex() - returns the wrong endianess but in a string.
endian_swap_uint() - tries to straighten it out, but is just returning a NULL

*/