3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i=0; $time = microtime(true); while($i < 5000) { $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 < 5000) { $i++; preg_replace('/(?!^)[[:upper:]][[:lower:]]/', '$0', preg_replace('/(?!^)[[:upper:]]+/', '_'.'$0', 'VeryLongClassName')); } $time = microtime(true) - $time; echo '2: ' . number_format($time, 3) ."\n";

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
7.3.10.0070.00616.58
7.3.00.0070.00716.33
7.2.130.0040.00816.76
7.2.120.0090.00616.98
7.2.110.0040.00416.62
7.2.100.0060.01016.88
7.2.90.0120.00417.16
7.2.80.0000.01617.14
7.2.70.0070.00716.95
7.2.60.0000.01217.14
7.2.50.0040.01416.98
7.2.40.0060.00917.06
7.2.30.0000.01016.56
7.2.20.0060.01217.01
7.2.10.0130.00316.79
7.2.00.0080.00818.12
7.1.250.0070.00715.89
7.1.70.0090.00517.30
7.1.60.0140.01019.40
7.1.50.0030.01417.25
7.1.00.0100.07022.37
7.0.200.0270.00315.11
7.0.140.0000.07722.02
7.0.120.0070.07022.05
7.0.100.0630.04319.93
7.0.90.0470.08019.90
7.0.80.0500.07719.91
7.0.70.0500.07319.95
7.0.60.0430.07319.98
7.0.50.0530.06020.25
7.0.40.0100.07720.12
7.0.30.0070.05020.11
7.0.20.0070.08020.16
7.0.10.0070.07720.08
7.0.00.0070.08320.18
5.6.280.0000.08721.20
5.6.250.0130.08721.03
5.6.240.0070.08720.88
5.6.230.0100.07720.84
5.6.220.0130.08720.98
5.6.210.0070.09020.95
5.6.200.0100.09021.34
5.6.190.0130.08021.32
5.6.180.0100.10021.21
5.6.170.0100.08721.31
5.6.160.0100.07721.36
5.6.150.0130.07721.36
5.6.140.0130.04721.32
5.6.130.0070.08321.38
5.6.120.0100.09021.38
5.6.110.0130.07321.21
5.6.100.0070.08721.28
5.6.90.0070.08021.29
5.6.80.0100.06720.68
5.6.70.0170.07020.61
5.6.60.0100.04020.66
5.6.50.0070.04320.68
5.6.40.0000.08320.64
5.6.30.0030.04320.64
5.6.20.0100.08320.77
5.6.10.0100.03720.66
5.6.00.0070.04020.59
5.5.380.0130.05320.67
5.5.370.0130.08720.66
5.5.360.0200.04320.69
5.5.350.0170.05020.69
5.5.340.0070.08321.11
5.5.330.0100.07321.20
5.5.320.0070.07721.18
5.5.310.0070.07721.11
5.5.300.0100.08021.17
5.5.290.0070.08321.14
5.5.280.0070.09020.90
5.5.270.0000.10021.13
5.5.260.0030.07021.07
5.5.250.0170.07320.97
5.5.240.0070.08720.58
5.5.230.0100.04020.57
5.5.220.0030.04720.57
5.5.210.0070.05020.30
5.5.200.0100.03720.50
5.5.190.0000.04720.46
5.5.180.0030.04320.37
5.5.160.0100.04320.46
5.5.150.0230.06020.44
5.5.140.0070.04020.55
5.5.130.0130.03720.52
5.5.120.0000.04720.51
5.5.110.0070.04020.52
5.5.100.0130.04020.45
5.5.90.0100.04020.26
5.5.80.0070.05720.45
5.5.70.0030.04320.38
5.5.60.0070.05720.40
5.5.50.0070.04320.34
5.5.40.0070.04020.30
5.5.30.0130.06020.33
5.5.20.0070.04020.38
5.5.10.0030.04720.32
5.5.00.0070.08020.27
5.4.450.0030.12019.50
5.4.440.0070.16019.66
5.4.430.0070.14019.55
5.4.420.0030.17719.53
5.4.410.0070.14019.40
5.4.400.0070.17018.99
5.4.390.0000.17319.23
5.4.380.0030.10319.18
5.4.370.0030.10319.17
5.4.360.0070.10319.23
5.4.350.0030.10719.30
5.4.340.0030.11319.30
5.4.320.0000.12019.29
5.4.310.0070.16719.33
5.4.300.0030.14319.14
5.4.290.0070.15019.14
5.4.280.0070.10319.23
5.4.270.0000.10719.14
5.4.260.0130.10319.17
5.4.250.0070.15719.13
5.4.240.0070.10019.22
5.4.230.0100.11319.23
5.4.220.0030.10319.22
5.4.210.0070.10719.27
5.4.200.0100.14719.18
5.4.190.0130.17319.13
5.4.180.0000.11019.05
5.4.170.0070.10719.21
5.4.160.0430.09719.11
5.4.150.0170.14018.95
5.4.140.0030.14716.30
5.4.130.0070.11716.51
5.4.120.0030.11316.52
5.4.110.0130.10016.63
5.4.100.0070.16016.55
5.4.90.0000.17716.39
5.4.80.0070.16716.69
5.4.70.0070.14716.41
5.4.60.0070.15316.42
5.4.50.0070.15316.35
5.4.40.0100.13716.36
5.4.30.0070.16716.36
5.4.20.0130.14716.52
5.4.10.0170.15016.54
5.4.00.0130.14316.06
5.3.290.0030.10714.65
5.3.280.0030.10714.57
5.3.270.0070.10014.59
5.3.260.0030.15714.53
5.3.250.0100.14714.67
5.3.240.0030.15314.68
5.3.230.0030.16714.53
5.3.220.0070.17314.63
5.3.210.0100.16314.63
5.3.200.0030.15714.63
5.3.190.0070.17014.50
5.3.180.0030.10714.63
5.3.170.0100.10014.57
5.3.160.0070.16014.57
5.3.150.0030.15314.50
5.3.140.0000.17014.48
5.3.130.0070.13014.53
5.3.120.0100.16314.46
5.3.110.0030.16014.52
5.3.100.0030.16314.14
5.3.90.0100.15014.14
5.3.80.0130.14314.14
5.3.70.0000.15714.14
5.3.60.0130.15014.14
5.3.50.0170.16314.14
5.3.40.0030.13014.14
5.3.30.0070.16314.14
5.3.20.0070.12714.14
5.3.10.0030.15314.14
5.3.00.0000.11014.14
5.2.170.0030.15714.14
5.2.160.0000.13314.14
5.2.150.0030.13714.14
5.2.140.0000.13714.14
5.2.130.0100.15014.14
5.2.120.0000.13014.14
5.2.110.0000.09714.14
5.2.100.0000.14314.14
5.2.90.0030.16014.14
5.2.80.0000.14714.14
5.2.70.0070.13714.14
5.2.60.0000.15314.14
5.2.50.0130.13314.14
5.2.40.0030.14014.14
5.2.30.0030.14714.14
5.2.20.0030.15314.14
5.2.10.0100.15314.14
5.2.00.0030.16714.14
5.1.60.0070.15014.14
5.1.50.0030.15314.14
5.1.40.0000.10714.14
5.1.30.0030.16314.14
5.1.20.0030.14314.14
5.1.10.0070.17014.14
5.1.00.0030.16714.14
5.0.50.0000.15314.14
5.0.40.0000.15314.14
5.0.30.0130.16014.14
5.0.20.0070.15714.14
5.0.10.0030.15714.14
5.0.00.0030.16714.14
4.4.90.0000.14314.14
4.4.80.0000.09014.14
4.4.70.0030.15314.14
4.4.60.0000.13014.14
4.4.50.0000.13714.14
4.4.40.0000.14314.14
4.4.30.0000.13714.14
4.4.20.0030.14314.14
4.4.10.0000.15314.14
4.4.00.0030.15014.14
4.3.110.0030.13314.14
4.3.100.0070.13714.14
4.3.90.0030.14014.14
4.3.80.0000.12714.14
4.3.70.0100.13314.14
4.3.60.0000.14014.14
4.3.50.0000.13714.14
4.3.40.0000.14014.14
4.3.30.0000.14014.14
4.3.20.0000.13714.14
4.3.10.0000.12714.14
4.3.00.0000.09314.14

preferences:
36.67 ms | 401 KiB | 5 Q