3v4l.org

run code in 300+ PHP versions simultaneously
<?php $whitespace = "\x09\x0b"; $string = "hi".$whitespace."bob : letter v"; echo $string . "\n"; echo preg_replace('/\s\s+|\\f|\\n|\\r|\x0b/', '', $string);
Output for 4.3.0 - 4.3.2, 5.4.41 - 5.4.45, 5.5.10 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
hi bob : letter v hibob : letter v
Output for 4.3.3 - 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 - 5.4.40, 5.5.0 - 5.5.9
hi bob : letter v hi bob : letter v
preferences:
291.98 ms | 403 KiB | 460 Q