class_uses()

(PHP 5 >= 5.4.0, PHP 7)

Return the traits used by the given class

说明

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

参数

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

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

class_uses() example

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

• class_parents()返回指定类的父类。
• get_declared_traits()返回所有已定义的 traits 的数组

To get ALL traits including those used by parent classes and other traits, use this function: 

If the class does not exist, you will get a warning, even if $autoload == false; I.e., if the class is not found, setting $autoload to false is not sufficient to silence the warning.
This is different from class_exists ($class_name, $autoload = true), which doesn't generate a warning in either case.

A slighly modified version from Stealz that also checks all the "parent" traits used by the traits: 

I have improved on ulf's improvement of stealz' code. I'm pretty sure the last "foreach" adds nothing, so I've removed it, as well as adding a check for string class names (as opposed to objects) to prevent the warning if the class is not found: 

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