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How many classes does PHP have?

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The amount of classes that you can instantiate (objects) is normally bound by the memory limit. So it depends how much memory is consumed by each object and the total number of objects. So you actually need to test how much memory your objects will consume. I've put together a little test for demonstration...
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The amount of classes that you can instantiate (objects) is normally bound by the memory limit. So it depends how much memory is consumed by each object and the total number of objects.

So you actually need to test how much memory your objects will consume. I've put together a little test for demonstration purposes. That one shows that more of 439 000 instances of (small) stdClass object instances are possible with a 128m memory limit:

$store = array();
$max = 500001;
for($i = 0; $i < $max; $i++)
    if ($i % 1000 === 0)
        echo $i, '(', number_format(memory_get_usage(),0, '',' '),')', "\n";
    $obj = new stdClass;
    $obj->name = 'just some data';
    $store[] = $obj;

So to answer your question: You need to test how much memory your scenario actually consumes, this will show you how many object instances you can have. It's less the arrayaccess but more the actual number of objects instances and the data associated with them in total of your application.

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