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This article mainly introduces "what is stdClass class". In daily operation, I believe many people have doubts about what is stdClass class. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what is stdClass class"! Next, please follow the editor to study!

The copy code is as follows:

StdClass just became popular in PHP5. StdClass is also a reserved class of zend. StdClass is a base class of PHP

Almost all classes inherit this class, so it can be new at any time, making this variable an object. meanwhile,

Another special feature of this base class is that there are no methods. Any variable that uses new stdClass ()

It is impossible to use $a-> test (). The uniqueness of PHP5's object, which is called anywhere

They are all address-referenced, so they consume less resources. When other pages assign a value to it, it is modified directly, rather than referencing a copy.

Most of the above definitions are correct, but there is a fatal diagnostic error: stdClass is a base class of PHP, and almost all classes inherit this class. Look at a simple example:

The copy code is as follows:

Class EmptyClass {

}

$object = new EmptyClass ()

If ($object instanceof stdClass) {

Echo 'yes'

} else {

Echo 'no'

}

Execute the code and output "no". This example fully illustrates that the stdClass class is not the base class for all classes. It's just a reserved class of PHP, or a role like the strlen function. Let's look at the implementation of the stdClass class from the perspective of the source code, which is registered in the Zend/zend_buildin_functions.c file. As follows:

The copy code is as follows:

ZEND_MINIT_FUNCTION (core) {/ *

Zend_class_entry class_entry

/ * Register the stdClass class * /

INIT_CLASS_ENTRY (class_entry, "stdClass", NULL)

Zend_standard_class_def = zend_register_internal_class (& class_entry TSRMLS_CC)

/ * Register default classes, interfaces, such as Exception class, some classes in SPL, etc. * /

Zend_register_default_classes (TSRMLS_C)

Return SUCCESS

}

/ *}}

This is the module initialization function of zend_builtin_module, which is automatically loaded when the PHP kernel initializes the module, so that the registration of the stdClass class will be performed. As you can see from this code, the stdClass class is a class with no member variables and no member methods. All of its magic methods, parents, interfaces, etc., are set to NULL when initialized. Since we cannot dynamically add methods to a class in PHP, this class can only be used to handle dynamic properties, which is a common usage.

At this point, the study of "what is the stdClass class" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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