3v4l.org

run code in 300+ PHP versions simultaneously
<?php function camelCaseToUnderscore($input) { return strtolower(preg_replace('/(?<!^)[A-Z]/', '_$0', $input)); } echo camelCaseToUnderscore('caseStudy'), "\n"; echo camelCaseToUnderscore('News'), "\n"; echo camelCaseToUnderscore('BuyACar'), "\n"; echo camelCaseToUnderscore('XML'), "\n"; echo camelCaseToUnderscore('SimpleXML'), "\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)
8.3.60.0140.00718.55
8.3.50.0120.00316.50
8.3.40.0100.00318.86
8.3.30.0070.00718.98
8.3.20.0060.00319.11
8.3.10.0060.00321.94
8.3.00.0080.00019.54
8.2.180.0110.00718.14
8.2.170.0140.00022.96
8.2.160.0130.00320.48
8.2.150.0050.00225.66
8.2.140.0040.00424.66
8.2.130.0040.00420.46
8.2.120.0040.00426.35
8.2.110.0000.01022.29
8.2.100.0060.00619.57
8.2.90.0030.00519.23
8.2.80.0000.00817.97
8.2.70.0070.00317.75
8.2.60.0060.00317.68
8.2.50.0000.00818.10
8.2.40.0000.00922.14
8.2.30.0050.00320.98
8.2.20.0070.00318.04
8.2.10.0040.00417.87
8.2.00.0040.00417.98
8.1.280.0070.00725.92
8.1.270.0040.00422.20
8.1.260.0000.00726.35
8.1.250.0040.00428.09
8.1.240.0030.00623.96
8.1.230.0080.00420.86
8.1.220.0050.00317.74
8.1.210.0050.00318.77
8.1.200.0030.00617.36
8.1.190.0090.00017.23
8.1.180.0000.00818.10
8.1.170.0030.00618.75
8.1.160.0030.00318.97
8.1.150.0020.00520.47
8.1.140.0000.01119.48
8.1.130.0040.00418.79
8.1.120.0070.00017.54
8.1.110.0000.00817.50
8.1.100.0040.00417.32
8.1.90.0090.00317.38
8.1.80.0000.00717.48
8.1.70.0070.00017.41
8.1.60.0080.00017.67
8.1.50.0080.00017.54
8.1.40.0040.00417.61
8.1.30.0020.00517.58
8.1.20.0070.00017.64
8.1.10.0020.00517.54
8.1.00.0030.00517.52
8.0.300.0040.00418.77
8.0.290.0080.00016.88
8.0.280.0030.00318.41
8.0.270.0000.00717.13
8.0.260.0000.00716.82
8.0.250.0070.00017.05
8.0.240.0070.00016.93
8.0.230.0000.00716.86
8.0.220.0000.00816.90
8.0.210.0030.00316.95
8.0.200.0030.00316.90
8.0.190.0050.00316.86
8.0.180.0040.00416.91
8.0.170.0000.00716.83
8.0.160.0000.00716.92
8.0.150.0040.00416.85
8.0.140.0000.00916.93
8.0.130.0000.00513.35
8.0.120.0040.00416.77
8.0.110.0000.00716.77
8.0.100.0070.00016.80
8.0.90.0040.00416.88
8.0.80.0150.00016.84
8.0.70.0050.00216.76
8.0.60.0000.00716.88
8.0.50.0050.00216.77
8.0.30.0140.00317.20
8.0.20.0110.01117.48
8.0.10.0080.00016.84
8.0.00.0070.01117.08
7.4.330.0000.00615.55
7.4.320.0070.00016.58
7.4.300.0030.00316.63
7.4.290.0070.00016.74
7.4.280.0080.00016.66
7.4.270.0000.00716.79
7.4.260.0000.00513.38
7.4.250.0050.00316.67
7.4.240.0000.00716.55
7.4.230.0040.00416.82
7.4.220.0120.00916.81
7.4.210.0070.01016.63
7.4.200.0040.00416.73
7.4.160.0070.00916.61
7.4.150.0030.01317.40
7.4.140.0110.00917.86
7.4.130.0160.00316.60
7.4.120.0110.00816.68
7.4.110.0070.01116.77
7.4.100.0070.01716.49
7.4.90.0110.00716.50
7.4.80.0120.01019.39
7.4.70.0100.00716.69
7.4.60.0130.00316.59
7.4.50.0100.00616.49
7.4.40.0070.01016.34
7.4.30.0040.01816.45
7.4.00.0100.00615.08
7.3.330.0050.00313.37
7.3.320.0030.00313.31
7.3.310.0030.00316.29
7.3.300.0030.00316.36
7.3.290.0060.01016.35
7.3.280.0080.00716.38
7.3.270.0130.00717.40
7.3.260.0090.00916.63
7.3.250.0140.00616.55
7.3.240.0070.01016.65
7.3.230.0090.00916.59
7.3.210.0060.01316.52
7.3.200.0060.01016.43
7.3.190.0130.00716.66
7.3.180.0110.00816.58
7.3.170.0110.00716.70
7.3.160.0120.00916.49
7.3.120.0070.01014.84
7.3.110.0040.01214.80
7.3.100.0060.00915.16
7.3.90.0070.00414.85
7.3.80.0060.00615.17
7.3.70.0070.00314.88
7.3.60.0030.00815.02
7.3.50.0000.01115.05
7.3.40.0030.01014.89
7.3.30.0030.00814.79
7.3.20.0030.00616.58
7.3.10.0030.00916.88
7.3.00.0060.00916.82
7.2.330.0110.00616.66
7.2.320.0190.00316.84
7.2.310.0150.00716.63
7.2.300.0200.00316.59
7.2.290.0080.00816.62
7.2.250.0080.00615.18
7.2.240.0070.01315.32
7.2.230.0030.01315.13
7.2.220.0040.00815.32
7.2.210.0040.01115.29
7.2.200.0030.00915.30
7.2.190.0140.00015.07
7.2.180.0090.00615.10
7.2.170.0060.00315.05
7.2.60.0030.01217.06
7.2.00.0060.00619.20
7.1.330.0000.01516.02
7.1.320.0030.00615.91
7.1.310.0040.01115.75
7.1.300.0030.01016.02
7.1.290.0100.00315.86
7.1.280.0000.00915.74
7.1.270.0060.00315.62
7.1.260.0030.01016.06
7.1.200.0030.01016.00
7.1.100.0030.00918.45
7.1.70.0030.00517.16
7.1.60.1370.00733.48
7.1.50.1870.01733.22
7.1.40.1370.00732.70
7.1.30.1770.01032.79
7.1.20.0230.00333.00
7.1.10.0030.01314.89
7.1.00.0100.00714.97
7.0.200.1600.00714.97
7.0.190.1970.01314.90
7.0.180.1200.01014.46
7.0.170.1500.00714.52
7.0.160.0070.00714.61
7.0.150.0030.01014.61
7.0.140.1300.00714.54
7.0.130.0130.00314.68
7.0.120.0070.00714.98
7.0.110.0100.00714.73
7.0.100.0770.01014.56
7.0.90.0030.01014.51
7.0.80.0100.00714.62
7.0.70.1430.01314.63
7.0.60.1400.01014.59
7.0.50.1300.00714.84
7.0.40.1430.00714.73
7.0.30.1330.01714.96
7.0.20.0030.01014.79
7.0.10.1430.00314.66
7.0.00.1300.01314.94

preferences:
38 ms | 401 KiB | 5 Q