class_uses

(PHP 5 >= 5.4.0, PHP 7)

class_uses — Return the traits used by the given class

说明

class_uses ( mixed $class , bool $autoload = true ) : array

This function returns an array with the names of the traits that the given class uses. This does however not include any traits used by a parent class.

参数

class

An object (class instance) or a string (class name).

autoload

Whether to allow this function to load the class automatically through the __autoload() magic method.

返回值

An array on success, or false on error.

范例

示例 #1 class_uses() example

<?php

trait foo { }
class bar {
  use foo;
}

print_r(class_uses(new bar));

print_r(class_uses('bar'));

function __autoload($class_name) {
   require_once $class_name . '.php';
}

// use __autoload to load the 'not_loaded' class
print_r(class_uses('not_loaded', true));

?>

以上例程的输出类似于：

Array
(
    [foo] => foo
)

Array
(
    [foo] => foo
)

Array
(
    [trait_of_not_loaded] => trait_of_not_loaded
)

参见