How does a PHP function return a class constant name?

PHP provides the get_class_constant() function, which can return the constant name of the specified class: specify the class name or instance to obtain the constant name. Enter the constant name to be retrieved.

#How does a PHP function return a class constant name?

PHP provides a convenient function get_class_constant(), which can return the specified constant name of a class.

Syntax:

string get_class_constant(object|string $class, string $constant_name)

Where:

• $class: Can be a class name or an instance of a class.
• $constant_name: The constant name to be returned.

Practical case:

The following is an example of how to use the get_class_constant() function:

class MyClass
{
    const MY_CONSTANT = 'My constant value';
}

$constant_name = get_class_constant('MyClass', 'MY_CONSTANT');

echo $constant_name; // 输出: MY_CONSTANT

Note:

If the specified constant does not exist or $class is not a valid class name, this function will return null.

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