[英]Call a static method of class from another class width '$this'
I've got some problem. 我有一些问题。 I want to call static
method of class from another class. 我想从另一个类调用类的static
方法。 Class name and method are created dynamically. 类名称和方法是动态创建的。
It's not really hard to do like: 做起来并不难:
$class = 'className';
$method = 'method';
$data = $class::$method();
BUT, i want to to do it like this 但是,我想这样做
class abc {
static public function action() {
//some code
}
}
class xyz {
protected $method = 'action';
protected $class = 'abc';
public function test(){
$data = $this->class::$this->method();
}
}
And it doesn't work if i don't assign $this->class
to a $class
variable, and $this->method
to a $method
variable. 如果我不将$this->class
赋值给$this->class
$class
变量,并将$this->method
分配给$method
变量,它就不起作用。 What's the problem? 有什么问题?
The object syntax $this->class
, $this->method
makes it ambiguous to the parser when combined with ::
in a static call. 对象语法$this->class
, $this->method
在静态调用中与::
结合时使解析器不明确。 I've tried every combination of variable functions/string interpolation such as {$this->class}::{$this->method}()
, etc... with no success. 我已经尝试了变量函数/字符串插值的每个组合,例如{$this->class}::{$this->method}()
等......但没有成功。 So assigning to a local variable is the only way, or call like this: 因此,分配给局部变量是唯一的方法,或者像这样调用:
$data = call_user_func(array($this->class, $this->method));
$data = call_user_func([$this->class, $this->method]);
$data = call_user_func("{$this->class}::{$this->method}");
If you need to pass arguments use call_user_func_array() . 如果需要传递参数,请使用call_user_func_array() 。
In PHP 7.0 you can use the code like this: 在PHP 7.0中,您可以使用如下代码:
<?php
class abc {
static public function action() {
return "Hey";
}
}
class xyz {
protected $method = 'action';
protected $class = 'abc';
public function test(){
$data = $this->class::{$this->method}();
echo $data;
}
}
$xyz = new xyz();
$xyz->test();
For PHP 5.6 and lower you can use the call_user_func function: 对于PHP 5.6及更低版本,您可以使用call_user_func函数:
<?php
class abc {
static public function action() {
return "Hey";
}
}
class xyz {
protected $method = 'action';
protected $class = 'abc';
public function test(){
$data = call_user_func([
$this->class,
$this->method
]);
echo $data;
}
}
$xyz = new xyz();
$xyz->test();
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