What are the magic method functions in php5?

The magic method functions in php5 include: "__sleep", "__wakeup", "__toString", "__construct", "__destruct", "__call", "__get", "__set", "__isset", " __unset" etc.

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Magic method function in php5

PHP5 contains many magic methods. Their most typical feature is that they all start with a double underscore '__'. These magic methods are written to complete certain specified functions.

• __sleep, this function will be called before serialize() serializes the object.

• __wakeup, this function will be called before unserialize() is deserialized.

• __toString, this function is called when converting an object into a string.

• __construct, constructor function, this function will be called when instantiating an object.

• #__destruct, destructor, called when the object instance is released.

• #__call, this function will be called when calling a method that is not in the class.

• #__get, called when accessing an attribute value that is not in the class.

• #__set, called when setting an attribute value that is not in the class.

• #__isset, called when calling the external isset() function to check whether the class contains a certain attribute value.

• __unset, called when a certain attribute value of the class is deleted.

• __set_state, called when using var_export to export the properties and values ​​of the object.

• __clone, called when copying a tired instance.

• __autoload, which is automatically called when a class is used and the class has not been loaded into the page.

Magic constant:

• __LINE__: Returns the current line number;

• __FILE__: Returns the full path and file name of the file. If used in an included file, the included file name is returned. Starting from php4.0.2, __FILE__ always contains an absolute path, while in previous versions it sometimes included A relative path

• __FUNCTION__: Returns the function name (newly added since php4.3.0). Since php5, this constant returns the name when the function is defined, which is case-sensitive. In php4, the value is always lowercase;

• __CLASS__: Returns the name of the class, since php4.3.0 Newly added, since php5, this constant returns the name when the class is defined, case-sensitive, in php4 the value is always lowercase;

• __METHOD__: Returns the method of the class name.

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