3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'Super this is a test this is a test'; $arr = explode(' ', $string); $vals = array_count_values($arr); foreach ($arr as $key => $word) { if ($vals[$word] > 1) { unset($arr[$key]); } } echo implode(' ', $arr);
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
Super

preferences:
75.76 ms | 406 KiB | 5 Q