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Bug #64404 assert(true) increases memory_get_usage()
Submitted: 2013-03-11 12:19 UTC Modified: 2013-03-11 14:48 UTC
From: zeusgerde at arcor dot de Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.4.12 OS: Windows 7
Private report: No CVE-ID: None
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 [2013-03-11 12:19 UTC] zeusgerde at arcor dot de 
Description:
------------
assert(true) increases memory_get_usage()


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

error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', 1);
echo phpversion(), "\r\n";

$oldMemUsage = memory_get_usage();
assert(true);
$newMemUsage = memory_get_usage();
assert('$oldMemUsage == $newMemUsage');
echo 'OK';


Expected result:
----------------
5.4.12
OK


Actual result:
--------------
5.4.12

Warning: assert(): Assertion "$oldMemUsage == $newMemUsage" failed in D:\bar.php 
on line 10
OK

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 [2013-03-11 14:48 UTC] nikic@php.net 
The memory usage is increased not due to the assert(true) call, but because of the variables used to store the memory usage. If you do something like this the memory usage will not change:

var_dump(memory_get_usage());
assert(true);
var_dump(memory_get_usage());
 [2013-03-11 14:48 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 [2013-03-12 07:37 UTC] zeusgerde at arcor dot de 
I guess the same goes for this? The string 'true' is a new variable, that is not 
freed?

<?php

echo "assert(true)\r\n";
echo memory_get_usage(), "\r\n"; // 124448
assert(true);
echo memory_get_usage(), "\r\n"; // 124448

echo "assert('true')\r\n";
echo memory_get_usage(), "\r\n"; // 124448
assert('true');
echo memory_get_usage(), "\r\n"; // 124640 > 124448
 
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