--TEST--
Bug #81243 (Too much memory is allocated for preg_replace())
--FILE--
<?php
$test_string = str_repeat('Eins zwei drei', 2000);

$replaced = preg_replace('/\s/', '-', $test_string);
$mem0 = memory_get_usage();
$replaced = str_repeat($replaced, 1);
$mem1 = memory_get_usage();
var_dump($mem0 == $mem1);

$replaced = preg_replace_callback('/\s/', function ($_) {return '-';}, $test_string);
$mem0 = memory_get_usage();
$replaced = str_repeat($replaced, 1);
$mem1 = memory_get_usage();
var_dump($mem0 == $mem1);
?>
--EXPECT--
bool(true)
bool(true)