How does a PHP function return a class static variable name?

PHP function get_class_vars returns an array of all static variables defined in a class, including their variable names and values.

#How does a PHP function return a class static variable name?

PHP provides theget_class_varsfunction, which can return an array of all static variables defined in a class:

Syntax:

get_class_vars(className)

Parameters:

• className: The name of the class whose static variables are to be obtained.

Return value:

An associative array where the key is the static variable name and the value is the static variable value.

Practical case:

Suppose there is aUserclass, which defines a static variable$countto track creation Number of instances:

class User { private static $count = 0; public function __construct() { self::$count++; } public static function getCount() { return self::$count; } }

Using theget_class_varsfunction, we can get the name and value of the$countvariable:

$classVars = get_class_vars('User'); echo $classVars['count']; // 输出：1

This code will output1because it reflects the creation of 1 instance ofUser.

This function is very useful for the following scenarios:

• Dynamic access to class static variables
• Get all static variables of a class for serialization or other operations.

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