[英]call a function before method call
Design question / PHP: I have a class with methods. 设计问题/ PHP:我有一个方法类。 I would like to call to an external function anytime when any of the methods within the class is called.
当调用类中的任何方法时,我想随时调用外部函数。 I would like to make it generic so anytime I add another method, the flow works with this method too.
我想把它变成通用的所以当我添加另一个方法时,流程也适用于这个方法。
Simplified example: 简化示例:
<?php
function foo()
{
return true;
}
class ABC {
public function a()
{
echo 'a';
}
public function b()
{
echo 'b';
}
}
?>
I need to call to foo() before a() or b() anytime are called. 我需要在调用a()或b()之前调用foo()。
How can I achieve this? 我怎样才能做到这一点?
Protect your methods so they're not directly accessible from outside the class, then use the magic __call() method to control access to them, and execute them after calling your foo() 保护你的方法,使它们不能从类外部直接访问,然后使用magic __call()方法来控制对它们的访问,并在调用你的foo()后执行它们
function foo()
{
echo 'In pre-execute hook', PHP_EOL;
return true;
}
class ABC {
private function a()
{
echo 'a', PHP_EOL;
}
private function b($myarg)
{
echo $myarg, ' b', PHP_EOL;
}
public function __call($method, $args) {
if(!method_exists($this, $method)) {
throw new Exception("Method doesn't exist");
}
call_user_func('foo');
call_user_func_array([$this, $method], $args);
}
}
$test = new ABC();
$test->a();
$test->b('Hello');
$test->c();
You need to use __invoke()
method of your class 您需要使用类的
__invoke()
方法
class ABC {
public function __invoke()
{
//Call your external function here
}
public function a()
{
echo 'a';
}
public function b()
{
echo 'b';
}
}
For your reference : http://php.net/manual/en/language.oop5.magic.php#object.invoke 供您参考: http : //php.net/manual/en/language.oop5.magic.php#object.invoke
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