3v4l.org

run code in 500+ PHP versions simultaneously
<?php $str = "aHR0cHM6Ly93d3cnVuY3Rpb24uc3RyLXNwbGl0LnBocA=="; $devide = 3; $char = '*'; // that not used in your string $add = $devide - strlen($str)%$devide; $total = strlen($str) + $add; $str = str_pad($str,$total,$char,STR_PAD_LEFT); $result = str_split($str, $total/$devide ); var_dump($result);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
array(3) { [0]=> string(16) "**aHR0cHM6Ly93d3" [1]=> string(16) "cnVuY3Rpb24uc3Ry" [2]=> string(16) "LXNwbGl0LnBocA==" }
preferences:
112.8 ms | 1424 KiB | 4 Q