(PHP 7 >= 7.4.0, PHP 8)
ReflectionReference::getId — Get unique ID of a reference
Returns an ID which is unique for the reference for the lifetime of that reference. This ID can be used to compare references for equality, or to maintain a map of known references.
This function has no parameters.
Returns a string of unspecified format.
Example #1 Basic ReflectionReference::getId() usage
<?php
$val1 = 'foo';
$val2 = 'bar';
$arr = [&$val1, &$val2, &$val1];
$rr1 = ReflectionReference::fromArrayElement($arr, 0);
$rr2 = ReflectionReference::fromArrayElement($arr, 1);
$rr3 = ReflectionReference::fromArrayElement($arr, 2);
var_dump($rr1->getId() === $rr2->getId());
var_dump($rr1->getId() === $rr3->getId());
?>The above example will output:
bool(false) bool(true)