Podręcznik PHP
Poprzedni | Dodatek B. Migrating from PHP 4 to PHP 5 | Następny

# Backward Incompatible Changes

Although most existing PHP 4 code should work without changes, you should pay attention to this backward imcompatible changes:

- strrpos() and strripos() now use the entire string as a needle.

- Ilegal use of string offsets causes `E_ERROR` instead of `E_WARNING`.

- array_merge() was changed to accept only arrays. If a non-array variable is passed, a `E_WARNING` will be thrown for every such parameter. Be careful because your code may start emitting `E_WARNING` out of the blue.

- PATH_TRANSLATED server variable is no longer set implicitly under Apache2 SAPI in contrast to the situation in PHP 4, where it is set to the same value as the SCRIPT_FILENAME server variable when it is not populated by Apache. This change was made to comply with the CGI specification. Please refer to bug #23610 for further information.

- The `T_ML_CONSTANT` constant is no longer defined by the Tokenizer extension. If error_reporting is set to `E_ALL`, PHP will generate a notice. Instead of `T_ML_CONSTANT` for /* */ the `T_COMMENT` constant is used, thus both // and /* */ are resolved as the `T_COMMENT` constant. However the PHPDoc style comments /** */ ,which starting PHP5 are parsed by PHP, are recongnized as `T_DOC_COMMENT`.

- $_SERVER should be populated with argc and argv if variables_order includes "S". If you have specifically configured your system to not create $_SERVER, then of course it shouldn't be there. The change was to always make argc and argv available in the CLI version regardless of the variables_order setting. As in, the CLI version will now always populate the global $argc and $argv variables.

- Classes must be declared before used.

Poprzedni | Spis treści | Następny
Migrating from PHP 4 to PHP 5 | Początek rozdziału | CLI and CGI