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denyy
answered May 2 '23 00:00
PHP 7.4 is mostly backwards compatible with previous versions of PHP , but there are some changes that may require modification to existing code in order to work properly.
Some of the key changes in PHP 7.4 include:
Typed properties : PHP 7.4 introduced support for typed properties, which allows developers to define the data type of class properties. This feature can help improve the reliability and readability of code, but may require changes to existing code that relies on dynamic property access.
Arrow functions : PHP 7.4 also introduced support for arrow functions, which provide a more concise syntax for defining small functions. While this feature is unlikely to cause compatibility issues, some older PHP code may need to be updated to use the new syntax.
Changes to constructor inheritance : PHP 7.4 made changes to the way constructors are inherited in class hierarchies. This may affect some existing code that relies on specific constructor behavior.
Deprecation of certain functions : PHP 7.4 deprecated several functions, such as array_key_exists and mbstring.func_overload. This means that these functions may be removed in future versions of PHP, and developers are encouraged to update their code to use alternative functions.
Overall, most PHP code should continue to work as expected in PHP 7.4, but it is always recommended to test existing code thoroughly before upgrading to a new version of PHP.