call_user_func_array() no longer accepts null as a second parameter and calls the function. It now emits a warning and does not call the function.
Backward Incompatible Changes
Although most existing PHP 5 code should work without changes, please take note of some backward incompatible changes:
The newer internal parameter parsing API has been applied across all the
extensions bundled with PHP 5.3.x. This parameter parsing API causes
functions to return
NULLwhen passed incompatible parameters. There are some exceptions to this rule, such as the get_class() function, which will continue to return
- clearstatcache() no longer clears the realpath cache by default.
- realpath() is now fully platform-independent. Consequence of this is that invalid relative paths such as __FILE__ . "/../x" do not work anymore.
- The call_user_func() family of functions now propagate $this even if the callee is a parent class.
- The array functions natsort(), natcasesort(), usort(), uasort(), uksort(), array_flip(), and array_unique() no longer accept objects passed as arguments. To apply these functions to an object, cast the object to an array first.
- The behaviour of functions with by-reference parameters called by value has changed. Where previously the function would accept the by-value argument, a fatal error is now emitted. Any previous code passing constants or literals to functions expecting references, will need altering to assign the value to a variable before calling the function.
- The new mysqlnd library necessitates the use of MySQL 4.1's newer 41-byte password format. Continued use of the old 16-byte passwords will cause mysql_connect() and similar functions to emit the error, "mysqlnd cannot connect to MySQL 4.1+ using old authentication."
The new mysqlnd library does not read mysql configuration files
(my.cnf/my.ini), as the older libmysqlclient library does. If your code relies on
settings in the configuration file, you can load it explicitly with the
mysqli_options() function. Note that this means the
PDO specific constants
PDO::MYSQL_ATTR_READ_DEFAULT_GROUPare not defined if MySQL support in PDO is compiled with mysqlnd.
- The trailing / has been removed from the SplFileInfo class and other related directory classes.
- The __toString() magic method can no longer accept arguments.
- The magic methods __get(), __set(), __isset(), __unset(), and __call() must always be public and can no longer be static. Method signatures are now enforced.
- The __call() magic method is now invoked on access to private and protected methods.
- func_get_arg(), func_get_args() and func_num_args() can no longer be called from the outermost scope of a file that has been included by calling include or require from within a function in the calling file.
- An emulation layer for the MHASH extension to wrap around the Hash extension have been added. However not all the algorithms are covered, notable the s2k hashing algorithm. This means that s2k hashing is no longer available as of PHP 5.3.0.
The following keywords are now reserved and may not be used in function, class, etc. names.
add a note User Contributed Notes Backward Incompatible Changes - [7 notes]
Chris Bolt ¶
3 years ago
munaw at munaw dot com ¶
2 years ago
Previous to PHP 5.3.0, the JPEG Support attribute was named JPG Support.
Be aware of this, in case you verify GD image support by this attribute!
mahbub at mahbubblog dot com ¶
2 years ago
If you're having the mysql connectivity problem for the short password format,there is a fix written by Mixu here
Boris 'borzakov' Ploujoux ¶
2 years ago
For those who often use the short open tag notations <? ... ?> and mostly <?= $var ?> (useful for template files) instead of standard notation <?php ... ?> : be careful !
In 5.3 version, the setting directive of the first notation is not PHP_INI_ALL anymore but PHP_INI_PERDIR.
In other words, you can't enable the "short_open_tag" directive directly with ini_set() function anymore ; you'll now have to set it in php.ini or httpd.conf (if you have access to it), or per-dir with .htaccess files.
See : http://www.php.net/manual/en/ini.core.php#ini.short-open-tag
mitek17 sobaka gmail.com ¶
3 years ago
After php version > 5.2.9 flush() stopped working. As a result the output buffer will not be returned at all.