php - 如何在 PHP 中的所有公共方法之前调用方法？

Question

我需要一个在我的每个公共方法之前运行的方法。

有没有像 __call 这样的公共方法的方法？

我想在我的 setter 方法之前修剪所有参数。

Answer 1

No, there is no mechanism like __call for public methods. But __call() is already what you are looking for.

I would define a "pseudo public" interface using __call:

class A {

    protected $value;

    /**
     * Enables caller to call a defined set of protected setters.
     * In this case just "setValue".
     */
    public function __call($name, $args) {
        // Simplified code, for brevity 
        if($name === "setValue") {
            $propertyName = str_replace("set", "", $name);
        }

        // The desired method that should be called before the setter
        $value = $this->doSomethingWith($propertyName, $args[0]);

        // Call *real* setter, which is protected
        $this->{"set$propertyName"}($value);
    }

    /**
     * *Real*, protected setter
     */
    protected function setValue($val) {
        // What about validate($val); ? ;)
        $this->value = $val;
    }

    /**
     * The method that should be called
     */
    protected function doSomethingWith($name, $value) {
         echo "Attempting to set " . lcfirst($name) . " to $value";
         return trim($value);
    }
}

If you try the example:

$a = new A();
$a->setValue("foo");

... you'll get the following output:

Attempting to set value to foo