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<?php $arg1 = "['1']"; $arg2 = "['2']"; $arg3 = "['3']"; $_SESSION['1']['2']['3'] = 'zzzz'; function setKey($session_keys, $val) { $current_key = ''; $counter = 0; $prev_step = &$_SESSION; $tmp = &$prev_step; $session_keys_array = explode(':', $session_keys); foreach ($session_keys_array as $key) { if (is_array($tmp[$key])) { $tmp = &$tmp[$key]; var_dump($tmp); } else { $tmp = $val; var_dump($tmp); } } } setKey('1:2:3',5); // var_dump($_SESSION);
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(1) { [2]=> array(1) { [3]=> string(4) "zzzz" } } array(1) { [3]=> string(4) "zzzz" } int(5)

preferences:
155.32 ms | 404 KiB | 228 Q