3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $i=0; $time = microtime(true); while($i < 500) { $i++; @preg_replace('/(^|[a-z])([A-Z])/e', 'strtolower(strlen("\\1") ? "\\1_\\2" : "\\2")', 'VeryLongClassName'); } $time = microtime(true) - $time; echo '1: ' . number_format($time, 3) ."\n"; $i=0; $time = microtime(true); while($i < 500) { $i++; @preg_replace('/(?!^)[[:upper:]][[:lower:]]/', '$0', preg_replace('/(?!^)[[:upper:]]+/', '_'.'$0', 'VeryLongClassName')); } $time = microtime(true) - $time; echo '2: ' . number_format($time, 3) ."\n";
Output for 7.0.0, 7.0.2 - 7.0.3, 7.1.0
1: 0.000 2: 0.000
Output for 7.0.4, 7.0.6 - 7.0.14
1: 0.001 2: 0.001
Output for 7.0.5
1: 0.001 2: 0.000
Output for 7.0.1
1: 0.000 2: 0.001
Output for hhvm-3.12.0
1: 0.003 2: 0.000
Output for hhvm-3.10.0
1: 0.003 2: 0.001
Output for 5.6.28
1: 0.016 2: 0.003
Output for 4.4.6, 5.1.5, 5.2.6, 5.2.8, 5.2.10, 5.2.14, 5.2.16 - 5.2.17, 5.4.0, 5.4.6, 5.4.9 - 5.4.11, 5.4.20, 5.4.26, 5.4.30 - 5.4.34, 5.4.38 - 5.4.39, 5.5.2, 5.5.26, 5.5.35, 5.6.4, 5.6.15, 5.6.18, 5.6.20 - 5.6.21
1: 0.009 2: 0.002
Output for 4.4.1, 4.4.7 - 4.4.8, 5.0.1, 5.1.0, 5.1.2, 5.1.4, 5.2.1, 5.2.4, 5.4.5, 5.4.27, 5.4.35, 5.4.44, 5.5.0, 5.5.12, 5.5.14 - 5.5.15, 5.5.22, 5.5.25, 5.5.27 - 5.5.29, 5.5.34, 5.6.2, 5.6.6 - 5.6.9, 5.6.12, 5.6.14, 5.6.19
1: 0.010 2: 0.002
Output for 4.3.4, 4.3.7, 4.4.2, 5.0.4, 5.4.7, 5.4.15 - 5.4.16, 5.4.29, 5.4.43, 5.5.1, 5.5.3 - 5.5.5, 5.5.8 - 5.5.9, 5.5.11, 5.5.13, 5.5.20, 5.5.30 - 5.5.32, 5.6.3, 5.6.13, 5.6.16 - 5.6.17
1: 0.007 2: 0.001
Output for 4.3.0, 4.3.2, 4.3.5, 4.3.11, 4.4.9, 5.0.3, 5.0.5, 5.4.28, 5.4.37, 5.5.16 - 5.5.18, 5.5.21, 5.5.33, 5.6.0, 5.6.5, 5.6.10 - 5.6.11
1: 0.011 2: 0.002
Output for 4.3.8 - 4.3.10, 4.4.3 - 4.4.4, 5.1.1, 5.2.5, 5.2.11 - 5.2.13, 5.3.0, 5.3.2, 5.3.4 - 5.3.5, 5.3.10, 5.3.12 - 5.3.13, 5.3.15, 5.3.20, 5.3.27 - 5.3.29, 5.4.8, 5.4.41, 5.5.6, 5.5.10, 5.5.19, 5.5.23 - 5.5.24, 5.6.1
1: 0.008 2: 0.002
Output for 4.3.6, 4.4.0, 5.1.3, 5.2.0, 5.2.2 - 5.2.3, 5.2.7, 5.3.1, 5.3.9, 5.3.21, 5.4.1, 5.4.4, 5.4.12 - 5.4.14, 5.4.18 - 5.4.19, 5.4.21 - 5.4.25, 5.4.40, 5.4.42, 5.4.45, 5.5.7
1: 0.006 2: 0.001
Output for 5.0.0, 5.4.36
1: 0.008 2: 0.001
Output for 5.3.6, 5.3.16, 5.3.19, 5.3.24, 5.4.17
1: 0.006 2: 0.002
Output for 5.2.15, 5.3.7 - 5.3.8, 5.3.14, 5.3.17 - 5.3.18, 5.3.22, 5.3.25 - 5.3.26, 5.4.2 - 5.4.3
1: 0.007 2: 0.002
Output for 5.2.9, 5.3.3, 5.3.11, 5.3.23
1: 0.005 2: 0.001
Output for 5.1.6
1: 0.015 2: 0.004
Output for 4.3.1, 4.3.3, 4.4.5, 5.0.2
1: 0.012 2: 0.002