3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'foo o a a'; $str = preg_replace('/\s\s+/g', ' ', $str); // This will be 'foo o' now echo $str;
Output for 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, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_replace(): Unknown modifier 'g' in /in/HM9hH on line 4
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/HM9hH on line 4

preferences:
249.01 ms | 401 KiB | 323 Q