Description:
------------
php-memcached 3.0.3
libmemcached 1.0.18
memcached 1.4.32
php 7.1.3

Both memcached and opcache needs to be loaded. opcache.enable_cli is not needed.

php -n -dextension=memcached.so -dzend_extension=opcache.so script.php


If the value ('test') set in memcached is changed, the script no longer fails.


($e == $a) === false, while ($a == $e) === true...

Test script:
---------------
<?php

class r
{
	public $d = ['test' => 'x'];

	public function m()
	{
		return [] + $this->d;
	}
}

(function()
{
	$m = new memcached;
	$m->addServer('127.0.0.1', 11211);
	$m->set('Something', 'test');

	$e = ['test' => 'x'];
	$a = (new r)->m();

	if (0 == ($e <=> $a))
		return 'success';

	var_dump([$e, $a]);
	var_dump([serialize($e), serialize($a)]);
	var_dump([
		'e === a' => $e === $a,
		'e == a' => $e == $a,
		'e <=> a' => $e <=> $a,
		'a <=> e' => $a <=> $e,
		'a === e' => $a === $e,
		'a == e' => $a == $e]
	);

	var_dump(debug_zval_dump($e), debug_zval_dump($a));

	die('this should not happen');
})();


Expected result:
----------------
success

Actual result:
--------------
array(2) {
  [0]=>
  array(1) {
    ["test"]=>
    string(1) "x"
  }
  [1]=>
  array(1) {
    ["test"]=>
    string(1) "x"
  }
}
array(2) {
  [0]=>
  string(25) "a:1:{s:4:"test";s:1:"x";}"
  [1]=>
  string(25) "a:1:{s:4:"test";s:1:"x";}"
}
array(6) {
  ["e === a"]=>
  bool(true)
  ["e == a"]=>
  bool(false)
  ["e <=> a"]=>
  int(1)
  ["a <=> e"]=>
  int(0)
  ["a === e"]=>
  bool(true)
  ["a == e"]=>
  bool(true)
}
array(1) refcount(1){
  ["test"]=>
  string(1) "x" refcount(1)
}
array(1) refcount(2){
  ["test"]=>
  string(1) "x" refcount(1)
}