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Don't forget that some modules may work in Xoops 2.5.1 on PHP 5.2, but not in PHP 5.3. If the user upgraded PHP too, it will be important to know as failures may not always be down to Xoops.
Here are some of the deprecated functions in PHP 5.3. Ereg and split turn up quite frequently in module code.
* 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.
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