为什么在实例化时调用PHP类方法？

Question

Need some help understanding what's going on in my PHP code.

index.php

include("cache.php");
$cache = new Cache();

cache.php

class Cache {
    private static $URL_CACHE;

    public function cache($url, $entityId) {
        echo '<br>caching '.$url.' as '.$entityId;
    }

When I request index.php, I get 'caching as' displayed, which is a surprise. I never called $cache->cache('', '');

What's calling the method?

---

As per Blake's answer, since the method name matches (somewhat) the class name, it's called on instantiation. For Java developers this will certainly be a surprise.

Answer 1

This is using deprecated PHP functionality to act as a __contruct() method. In older versions of PHP (Removed in 7) If you had a class named Foo and a function named foo() it was how you would call it as a constructor.

In short, this is being called by you instantiating the class. If you change your cache() method to makeCache() I bet it will go away.

Another solution is to have an empty constructor as well, thanks JimL.

public function __construct() {

}