Online PHP editor | output for 3ZrRu

@ 2014-09-09T15:50:28Z

<?php
$vals = array('a', 'b', 'c', 'd', 'e', 'f');
$token = true;

$i = 0;

while($token) {
    $val = $vals[$i];

    if ($val == 'a') {
        echo 'a';
    } elseif ($val == 'b') {
        echo 'b';
    } elseif ($val == 'c') {
        echo 'c';
    } elseif ($val == 'd') {
        echo 'd';
    } elseif ($val == 'e') {
        echo 'e';
    } elseif ($val == 'f') {
        echo 'f';
    } else {
       $token = false;
    }

    $i++;
}

exit;

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: abcdef Warning: Undefined array key 6 in /in/3ZrRu on line 8
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: abcdef Notice: Undefined offset: 6 in /in/3ZrRu on line 8
Output for 7.3.32 - 7.3.33: abcdef
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: abcdef Notice: Undefined offset: 6 in /in/3ZrRu on line 8

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