PHP OOP按属性查找对象

Question

I'm trying to pull a random instance of a class (object) by generating a random number and checking object ids against that number.

I've found a lot of info on how to retrieve an object attribute (specifically here it's the id) but not without knowing which object first.

So within my class I've got

public function getID() {
return $this->id;
}

But

getID()

only works if I use it as

$object->getID()

Is there a way to do something similar but for every object in a class, without specifying the objects?

I'm trying to avoid having to write if/then for every object in the class.

Answer 1

You could set up an array of objects, then iterate over the array and call the getID() method on each object. If your array of objects is called $myObjects...

foreach($myObjects as $object) {
    $object->getID();  //And do something with it
}

However, if you want to pick a random object out of a set of objects, testing a whole bunch of them to see if they are the object you picked isn't really ideal. You'd be better off putting them into an array and using array_rand() to select a random object out of the array.

What's your purpose for doing this? That may indicate a better way to approach this.

Answer 2

I think you'd have to have planned for this eventuality, then loop thru the candidate objects as @Surreal Dreams; suggests.

See Get all instances of a class in PHP