3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = '"hello world" how are you?'; echo preg_replace_callback('~("[^"]+")|\S+~', function($m) { return isset($m[1]) ? "+" . $m[1] : "+" . $m[0] . "*"; }, $str);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
+"hello world" +how* +are* +you?*
preferences:
116.02 ms | 408 KiB | 5 Q