php 使用fopen函数创建、打开文件详解及实例代码
349
2024-01-25
(PHP 5 >= 5.4.0)
class_uses — Return the traits used by the given class
说明
array class_uses ( mixed$class
[, bool $autoload = true
] )
This function returns an array with the names of the traits that the
given class uses. This does however not include
any traits used by a parent class.
参数
class
An object (class instance) or a string (class name).
autoload
Whether to allow this function to load the class automatically through the __autoload() magic method.
返回值
An array on success, or FALSE on error.
范例
Example #1 class_uses() example
<?php
trait foo { }
class bar {
use foo;
}
print_r(class_uses(new bar));
print_r(class_uses('bar'));
function __autoload($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
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
