Onderstaande functies komen te vervallen in PHP 5.3

    * call_user_method() (use call_user_func() instead)
    * call_user_method_array() (use call_user_func_array() instead)
    * define_syslog_variables()
    * dl()
    * ereg() (use preg_match() instead)
    * ereg_replace() (use preg_replace() instead)
    * eregi() (use preg_match() with the 'i' modifier instead)
    * eregi_replace() (use preg_replace() with the 'i' modifier instead)
    * set_magic_quotes_runtime() and its alias, magic_quotes_runtime()
    * session_register() (use the $_SESSION superglobal instead)
    * session_unregister() (use the $_SESSION superglobal instead)
    * session_is_registered() (use the $_SESSION superglobal instead)
    * set_socket_blocking() (use stream_set_blocking() instead)
    * split() (use preg_split() instead)
    * spliti() (use preg_split() with the 'i' modifier instead)
    * sql_regcase()
    * mysql_db_query() (use mysql_select_db() and mysql_query() instead)
    * mysql_escape_string() (use mysql_real_escape_string() instead)
    * Passing locale category names as strings is now deprecated. Use the LC_* family of constants instead.
    * The is_dst parameter to mktime(). Use the new timezone handling functions instead
    * Register Globals vervallen http://php.net/manual/en/security.globals.php Gebruik $_POST en $_GET in plaats van register globals.

Meer op: http://php.net/manual/en/migration53.deprecated.php