- Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
- array ( 0 => 'word1', 1 => '&word2', 2 => '!word3', 3 => 'word4', 4 => '&word5', )
<?php
$string = 'word1&word2 !word3 word4 &word5';
var_export(
preg_split('/ |(?<! )(?=[&!])/', $string)
);