note 46590 added to language.references

Re-using variables which where references before, without unsetting them first, leads to unexpected behaviour. The following code: <?php $numbers = array(); for ($i = 1; $i < 4; $i++) { $numbers[] = null; $num = count($numbers); $index =& $numbers[$num ? $num - 1 : $num]; $index = $i; } foreach ($numbers as $index) { print "$index\n"; } ?> Does not produce: 1 2 3 But instead: 1 2 2 Applying unset($index) before re-using the variable fixes this and the expected list will be produced: 1 2 3 ---- Manual Page -- http://www.php.net/manual/en/language.references.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+46590 Delete -- http://master.php.net/manage/user-notes.php?action=delete+46590&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+46590&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+46590&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+46590&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+46590&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+46590&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+46590&report=yes Search -- http://master.php.net/manage/user-notes.php