What are the magic functions of PHP?

PHP’s magic functions include construct(), destruct(), get, set(), isset(), unset(), call(), callStatic(), toString(), invoke(), clone (), sleep(), wakeup(), set_state(), debugInfo(), etc. Detailed introduction: 1. construct(), initialize the properties of the object or perform other necessary operations, etc.

The operating environment of this article: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

PHP’s magic functions are special functions that begin and end with a double underscore (__) and are used to perform specific operations or provide specific functionality. The following are some commonly used PHP magic functions:

construct(): The constructor that is automatically called when creating an object. Can be used to initialize the properties of an object or perform other necessary operations.

destruct(): A destructor that is automatically called before an object is destroyed. Can be used to perform some cleanup operations, such as closing database connections or releasing resources.

get: Automatically called when accessing a property of an object that does not exist or is inaccessible. Can be used to dynamically obtain or calculate the value of a property.

set(): Automatically called when giving an object’s attribute value. Can be used to filter or validate attributes, or perform other necessary operations.

isset(): Automatically called when using the isset() function to determine whether an object's attributes exist. Can be used to detect whether a property exists or has a specific value.

unset(): Automatically called when using the unset() function to destroy the properties of an object. Can be used to perform some cleanup operations, such as freeing memory or deleting temporary files.

call(): Automatically called when calling a non-existent or inaccessible method of an object. Can be used to implement dynamic method calls on objects.

callStatic(): Automatically called when calling a non-existent or inaccessible static method of a class. Can be used to implement dynamic method calls of classes.

toString(): Automatically called when converting an object to a string. Can be used to define a string representation of an object.

invoke(): Automatically called when an object is called as a function. Can be used to use objects as callable functions.

clone(): Automatically called when cloning an object. Can be used to perform some necessary operations, such as copying the properties of an object or initializing a new object.

sleep(): Automatically called when serializing an object into a string. Can be used to determine which objects need to be saved when serializing.

wakeup(): Automatically called when deserializing a string into an object. Can be used to restore the state of an object or perform other necessary operations.

set_state(): Automatically called when using var_export() to export an object. Can be used to define the export behavior of objects.

debugInfo(): Automatically called when printing an object using var_dump() or print_r(). Can be used to define debugging information for objects.

These magic functions can make us more flexible and convenient when using PHP. By overriding these magic functions, we can customize the behavior of objects and achieve more powerful and efficient code.

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