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--TEST--
Bug #21998 (array_pop() does not reset the current array position)
--FILE--
<?php
$a = array("a", "b", "c");
var_dump(key($a));
var_dump(array_pop($a));
var_dump(key($a));
var_dump(array_pop($a));
var_dump(key($a));
var_dump(array_pop($a));
var_dump(key($a));
?>
--EXPECT--
int(0)
string(1) "c"
int(0)
string(1) "b"
int(0)
string(1) "a"
NULL
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