类型之后的数字在var_dump（object）PHP中意味着什么？ [重复]

Question

This question already has an answer here:

• What is #<some-number> next to object(someClass) in var_dump of an object? I have an inference. Am I right? 2 answers

For example, in the manual

<?php
    class C {}

    function getC(): C {
        return new C;
    }

    var_dump(getC());
?>

Output

object(C)#1 (0) {
}

What does #1, (0) mean?

</div>

Answer 1

The #X is the order of instantiation of the object and the (X) is the number of properties:

class C {
    public $a;
}
$a = new C;
$b = new C;

var_dump($b);  // instantiated second
var_dump($a);  // instantiated first

Yields #1 for the first instantiated object and #2 for the second and (1) for both since they have one property a:

object(C)#2 (1) {
  ["a"]=>
  NULL
}
object(C)#1 (1) {
  ["a"]=>
  NULL
}