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 the get_class_vars function, 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 a User class, which defines a static variable $count to track creation Number of instances:

class User {
    private static $count = 0;

    public function __construct() {
        self::$count++;
    }

    public static function getCount() {
        return self::$count;
    }
}

Using the get_class_vars function, we can get the name and value of the $count variable:

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

This code will output 1 because it reflects the creation of 1 instance of User.

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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