If you maintain a legacy PHP codebase or a WordPress plugin that hasn't seen a major refactor since PHP 7.4, your error logs are likely flooding with this message after upgrading to PHP 8.2: Deprecated: Creation of dynamic property ClassName::$propertyName is deprecated This is not a false alarm. While it is currently a deprecation warning, PHP 9.0 will escalate this to a fatal ErrorException . The era of treating PHP objects as "fancy arrays" where you can attach arbitrary data at runtime is over. The Root Cause: Why PHP Changed Historically, PHP allowed developers to assign values to undeclared properties on any object. Under the hood, the Zend Engine would silently create a dynamic property map (a HashTable) attached to the object instance to store these values. While convenient, this behavior caused two major issues: Performance: Accessing declared properties is optimized via strict memory offsets. Accessing dynamic properties requires a slower hash table lookup. ...
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