3v4l.org

run code in 300+ PHP versions simultaneously
<?php $re = '/(?:"\K([^_\r\n]+)|\G(?!^))(?=[^":\r\n]*")(?=[^:\r\n]*:)_?([a-zA-Z])([^"_\r\n]*)/'; $str = '"aa_bb" : "foo" "pp_Qq" : "bar" "Xx_yY_zz" : "foobar" "Xx_yYyyyyyYyY_zz_a" : "foobar"'; $result = preg_replace_callback($re, function($matches) { return strtolower($matches[1]) . strtoupper($matches[2]) . strtolower($matches[3]); }, $str); echo $result;

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)
8.5.10.0100.00816.92
8.5.00.0120.01020.14
8.4.150.0030.00014.05
8.4.140.0120.01017.80
8.4.130.0130.00718.79
8.4.120.0110.00824.21
8.4.110.0110.00921.96
8.4.100.0130.00818.12
8.4.90.0150.00618.79
8.4.80.0060.00318.13
8.4.70.0070.00117.83
8.4.60.0070.00318.91
8.4.50.0130.00919.71
8.4.40.0030.00619.60
8.4.30.0160.00018.65
8.4.20.0070.01320.61
8.4.10.0030.00617.80
8.3.280.0100.00920.41
8.3.270.0110.01016.80
8.3.260.0120.00816.75
8.3.250.0090.00718.73
8.3.240.0130.00616.86
8.3.230.0090.00916.66
8.3.220.0080.00417.20
8.3.210.0100.00816.76
8.3.200.0030.00616.55
8.3.190.0120.00716.65
8.3.180.0060.00316.70
8.3.170.0180.00016.79
8.3.160.0130.00616.50
8.3.150.0150.00317.39
8.3.140.0160.00316.69
8.3.130.0050.00318.59
8.3.120.0130.00320.86
8.3.110.0040.00417.05
8.3.100.0060.01316.83
8.3.90.0070.01018.55
8.3.80.0100.00018.43
8.3.70.0150.00616.63
8.3.60.0110.00418.52
8.3.50.0090.00818.41
8.3.40.0100.00618.88
8.3.30.0120.00318.98
8.3.20.0060.00320.78
8.3.10.0000.00822.09
8.3.00.0040.00422.43
8.2.290.0080.00920.55
8.2.280.0060.00620.50
8.2.270.0060.00316.93
8.2.260.0030.00618.89
8.2.250.0060.00316.82
8.2.240.0050.00517.18
8.2.230.0030.00620.94
8.2.220.0050.00324.06
8.2.210.0050.00326.77
8.2.200.0030.00617.00
8.2.190.0100.01016.75
8.2.180.0090.00618.75
8.2.170.0110.01122.96
8.2.160.0070.00722.22
8.2.150.0070.00024.18
8.2.140.0040.00424.66
8.2.130.0080.00026.16
8.2.120.0080.00019.80
8.2.110.0080.00320.45
8.2.100.0110.00017.97
8.2.90.0000.00817.98
8.2.80.0030.00519.02
8.2.70.0050.00317.73
8.2.60.0030.00618.05
8.2.50.0080.00018.07
8.2.40.0000.00820.10
8.2.30.0030.00618.13
8.2.20.0000.00718.01
8.2.10.0000.00719.61
8.2.00.0050.00219.30
8.1.330.0130.00622.02
8.1.320.0110.00916.71
8.1.310.0090.00916.57
8.1.300.0060.01318.20
8.1.290.0040.00818.88
8.1.280.0070.01025.92
8.1.270.0030.00622.25
8.1.260.0050.00326.35
8.1.250.0110.00428.09
8.1.240.0090.00022.11
8.1.230.0070.00318.99
8.1.220.0000.00817.78
8.1.210.0080.00018.77
8.1.200.0000.00917.50
8.1.190.0000.00817.60
8.1.180.0030.00518.10
8.1.170.0060.00318.79
8.1.160.0030.00618.95
8.1.150.0030.00619.00
8.1.140.0000.00820.19
8.1.130.0050.00320.30
8.1.120.0090.00017.50
8.1.110.0040.00417.63
8.1.100.0060.00317.62
8.1.90.0000.00717.63
8.1.80.0050.00517.63
8.1.70.0040.00417.51
8.1.60.0060.00317.71
8.1.50.0000.00817.74
8.1.40.0090.00017.66
8.1.30.0000.00917.81
8.1.20.0040.00417.88
8.1.10.0000.00817.79
8.1.00.0030.00917.66
8.0.300.0030.00718.84
8.0.290.0040.00417.00
8.0.280.0040.00418.45
8.0.270.0070.00016.89
8.0.260.0030.00520.05
8.0.250.0000.00717.04
8.0.240.0050.00217.11
8.0.230.0000.00717.03
8.0.220.0060.00317.09
8.0.210.0030.00316.92
8.0.200.0060.00017.14
8.0.190.0050.00316.99
8.0.180.0080.00016.97
8.0.170.0100.00017.00
8.0.160.0050.00217.14
8.0.150.0070.00016.96
8.0.140.0000.00717.07
8.0.130.0060.00013.48
8.0.120.0040.00416.95
8.0.110.0040.00416.96
8.0.100.0040.00417.15
8.0.90.0040.00416.93
8.0.80.0130.00617.02
8.0.70.0040.00416.95
8.0.60.0000.00816.86
8.0.50.0030.00517.07
8.0.30.0150.00916.96
8.0.20.0210.00617.34
8.0.10.0000.00717.06
8.0.00.0180.00316.95
7.4.330.0020.00215.55
7.4.320.0040.00416.80
7.4.300.0000.00616.82
7.4.290.0000.00816.82
7.4.280.0080.00016.71
7.4.270.0030.00316.63
7.4.260.0060.00316.74
7.4.250.0070.00016.70
7.4.240.0060.00116.75
7.4.230.0040.00416.73
7.4.220.0070.00016.58
7.4.210.0060.01016.73
7.4.200.0030.00316.86
7.4.130.0100.01216.73
7.4.120.0130.00716.62
7.4.110.0070.01016.77
7.4.100.0170.00316.86
7.4.90.0110.00716.89
7.4.80.0120.00619.39
7.4.70.0060.01516.66
7.4.60.0110.00816.65
7.4.50.0070.00716.57
7.4.40.0060.00916.76
7.4.10.0070.01014.90
7.4.00.0090.00915.12
7.3.330.0000.00716.53
7.3.320.0000.00513.39
7.3.310.0000.00716.55
7.3.300.0030.00316.41
7.3.290.0060.00816.46
7.3.280.0070.00716.48
7.3.260.0100.00916.67
7.3.240.0140.00516.59
7.3.230.0070.01016.64
7.3.210.0030.01416.73
7.3.200.0090.00616.95
7.3.190.0030.01716.87
7.3.180.0160.00616.88
7.3.170.0150.00316.75
7.3.160.0090.00616.48
7.3.130.0060.00914.97
7.3.120.0070.01015.19
7.3.110.0090.00915.33
7.3.100.0070.00614.85
7.3.90.0050.00614.95
7.3.80.0060.00915.02
7.3.70.0080.00615.06
7.3.60.0110.00314.88
7.3.50.0080.00414.96
7.3.40.0080.00615.05
7.3.30.0100.00515.06
7.3.20.0110.00416.02
7.3.10.0090.00515.69
7.3.00.0080.00615.96
7.2.330.0120.00616.64
7.2.320.0140.00416.97
7.2.310.0140.00416.82
7.2.300.0090.00916.86
7.2.290.0090.01216.79
7.2.260.0070.01015.43
7.2.250.0090.00915.21
7.2.240.0120.00315.37
7.2.230.0030.01315.01
7.2.220.0090.00815.20
7.2.210.0050.00815.36
7.2.200.0050.01015.13
7.2.190.0000.01615.13
7.2.180.0060.00815.15
7.2.170.0080.00815.13
7.2.160.0060.00915.15
7.2.150.0070.00616.13
7.2.140.0030.01216.22
7.2.130.0030.01416.11
7.2.120.0050.01016.09
7.2.110.0030.01216.21
7.2.100.0060.01016.13
7.2.90.0070.00716.29
7.2.80.0090.00816.20
7.2.70.0070.00816.42
7.2.60.0050.00716.13
7.2.50.0070.00816.07
7.2.40.0080.00516.17
7.2.30.0080.00616.28
7.2.20.0060.00916.32
7.2.10.0050.00916.28
7.2.00.0060.00716.25
7.1.330.0100.00315.91
7.1.320.0050.01215.05
7.1.310.0120.01015.00
7.1.300.0010.01214.83
7.1.290.0080.00514.79
7.1.280.0090.00415.02
7.1.270.0100.00514.99
7.1.260.0050.01014.93
7.1.250.0070.00714.93
7.1.240.0080.00416.00
7.1.230.0040.00716.16
7.1.220.0040.00915.70
7.1.210.0090.00616.01
7.1.200.0060.00916.04
7.1.190.0070.00716.07
7.1.180.0070.00715.94
7.1.170.0000.01115.95
7.1.160.0100.00315.98
7.1.150.0030.01016.06
7.1.140.0060.00315.98
7.1.130.0060.00315.90
7.1.120.0090.00016.09
7.1.110.0030.01015.96
7.1.100.0060.00615.98
7.1.90.0030.01015.86
7.1.80.0000.01215.74
7.1.70.0030.00616.14
7.1.60.0030.00815.94
7.1.50.0090.00316.00
7.1.40.0060.00315.82
7.1.30.0060.00615.94
7.1.20.0060.00616.02
7.1.10.0070.00715.98
7.1.00.0040.00715.85

preferences:
158.65 ms | 403 KiB | 5 Q