3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'f'; $charFirst = substr($string, 0, 1); $charLast = substr($string, strlen($string) - 1, 1); echo $charFirst . PHP_EOL; echo $charLast . PHP_EOL;

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)
8.3.60.0110.00316.38
8.3.50.0230.00621.87
8.3.40.0100.01018.75
8.3.30.0100.00319.09
8.3.20.0040.00420.25
8.3.10.0020.00523.64
8.3.00.0040.00419.43
8.2.180.0110.00718.33
8.2.170.0140.00022.96
8.2.160.0070.00720.53
8.2.150.0030.00624.18
8.2.140.0050.00324.66
8.2.130.0030.00526.16
8.2.120.0080.00019.36
8.2.110.0040.00420.53
8.2.100.0080.00318.22
8.2.90.0040.00419.14
8.2.80.0030.00617.97
8.2.70.0030.00617.63
8.2.60.0020.00518.04
8.2.50.0040.00418.07
8.2.40.0030.00619.88
8.2.30.0030.00518.09
8.2.20.0040.00417.68
8.2.10.0000.00818.21
8.2.00.0040.00417.84
8.1.280.0070.01425.92
8.1.270.0000.00824.01
8.1.260.0080.00026.35
8.1.250.0000.00728.09
8.1.240.0030.00622.23
8.1.230.0080.00419.21
8.1.220.0040.00417.74
8.1.210.0000.00818.77
8.1.200.0030.00717.21
8.1.190.0050.00317.23
8.1.180.0040.00418.10
8.1.170.0030.00518.65
8.1.160.0000.00721.94
8.1.150.0040.00418.60
8.1.140.0000.00717.38
8.1.130.0030.00317.86
8.1.120.0000.00717.28
8.1.110.0040.00417.37
8.1.100.0000.00717.23
8.1.90.0040.00417.25
8.1.80.0040.00417.27
8.1.70.0070.00017.40
8.1.60.0000.00817.43
8.1.50.0030.00517.48
8.1.40.0080.00017.45
8.1.30.0040.00417.48
8.1.20.0040.00417.57
8.1.10.0080.00017.50
8.1.00.0000.00917.33
8.0.300.0020.00518.77
8.0.290.0070.00016.75
8.0.280.0050.00218.34
8.0.270.0030.00317.29
8.0.260.0030.00317.23
8.0.250.0070.00016.92
8.0.240.0110.00016.93
8.0.230.0080.00016.88
8.0.220.0030.00316.87
8.0.210.0070.00016.89
8.0.200.0000.00616.86
8.0.190.0070.00016.99
8.0.180.0000.00816.93
8.0.170.0040.00416.91
8.0.160.0040.00416.89
8.0.150.0080.00016.73
8.0.140.0000.00716.80
8.0.130.0050.00013.35
8.0.120.0050.00316.85
8.0.110.0000.00716.77
8.0.100.0000.00716.90
8.0.90.0040.00416.88
8.0.80.0100.00716.80
8.0.70.0000.00816.77
8.0.60.0040.00416.71
8.0.50.0030.00516.86
8.0.30.0120.00617.05
8.0.20.0140.00817.40
8.0.10.0000.00816.88
8.0.00.0110.00716.78
7.4.330.0050.00015.00
7.4.320.0050.00316.52
7.4.300.0050.00316.41
7.4.290.0030.00316.53
7.4.280.0040.00416.52
7.4.270.0000.00716.35
7.4.260.0060.00316.43
7.4.250.0040.00416.54
7.4.240.0020.00516.56
7.4.230.0000.01016.52
7.4.220.0060.01216.48
7.4.210.0070.00716.63
7.4.200.0070.00016.31
7.4.160.0150.00016.45
7.4.150.0090.00917.40
7.4.140.0170.00717.86
7.4.130.0070.01016.45
7.4.120.0090.00716.37
7.4.110.0100.00616.46
7.4.100.0140.00716.37
7.4.90.0130.00316.43
7.4.80.0070.01019.39
7.4.70.0130.00316.54
7.4.60.0190.00316.41
7.4.50.0050.00216.56
7.4.40.0000.01716.25
7.4.30.0120.00916.31
7.4.00.0030.01415.01
7.3.330.0050.00013.21
7.3.320.0050.00013.18
7.3.310.0000.00716.29
7.3.300.0030.00316.31
7.3.290.0040.01516.38
7.3.280.0120.00816.41
7.3.270.0130.00517.40
7.3.260.0140.00716.51
7.3.250.0120.00516.45
7.3.240.0100.00716.43
7.3.230.0080.00816.48
7.3.210.0100.00716.20
7.3.200.0130.00319.39
7.3.190.0180.00016.29
7.3.180.0030.01916.32
7.3.170.0060.01016.37
7.3.160.0090.00616.26
7.3.120.0060.01214.72
7.3.110.0040.01514.78
7.3.100.0070.01114.70
7.3.90.0030.01214.84
7.3.80.0050.00514.56
7.3.70.0070.00714.49
7.3.60.0030.00714.67
7.3.50.0030.00914.50
7.3.40.0060.01214.80
7.3.30.0090.00014.83
7.3.20.0040.01116.74
7.3.10.0100.00016.46
7.3.00.0060.00916.41
7.2.330.0120.00616.70
7.2.320.0060.01116.40
7.2.310.0090.00616.78
7.2.300.0080.00816.71
7.2.290.0090.00916.61
7.2.250.0180.00015.18
7.2.240.0060.01415.07
7.2.230.0070.00715.11
7.2.220.0040.01115.17
7.2.210.0070.00714.93
7.2.200.0030.01315.08
7.2.190.0070.00314.98
7.2.180.0040.01215.13
7.2.170.0120.00314.95
7.2.00.0000.01019.21
7.1.330.0060.00915.83
7.1.320.0080.00615.68
7.1.310.0070.00315.83
7.1.300.0060.00615.59
7.1.290.0070.00715.57
7.1.280.0000.01115.69
7.1.270.0030.00715.51
7.1.260.0000.01215.78
7.1.200.0030.01015.85
7.1.100.0050.00518.30
7.1.70.0000.01516.92
7.1.60.0000.02219.70
7.1.50.0060.01216.95
7.1.00.0000.07722.30
7.0.200.0040.01316.50
7.0.140.0000.07722.16
7.0.60.0170.07020.02
7.0.50.0070.03717.89
7.0.40.0100.03720.23
7.0.30.0530.05720.00
7.0.20.0370.07320.04
7.0.10.0070.09020.18
7.0.00.0070.08320.18
5.6.280.0100.06321.02
5.6.210.0030.04020.52
5.6.200.0070.07318.08
5.6.190.0030.07020.62
5.6.180.3430.04020.44
5.6.170.0300.07720.37
5.6.160.0070.04320.49
5.6.150.0070.07718.22
5.6.140.0030.08318.09
5.6.130.0030.07718.18
5.6.120.0070.08321.11
5.6.110.0030.05320.96
5.6.100.0070.08720.95
5.6.90.0030.05721.00
5.6.80.0070.05020.33
5.6.70.3970.04020.39
5.5.350.0030.08320.39
5.5.340.0030.05717.91
5.5.330.0130.07320.57
5.5.320.0270.04020.18
5.5.310.0230.04320.17
5.5.300.0070.04017.91
5.5.290.0070.05317.92
5.5.280.0200.07020.73
5.5.270.0130.07720.79
5.5.260.0070.07720.76
5.5.250.0200.06320.61
5.5.240.0270.05720.23
5.4.450.0700.03743.90
5.4.440.0130.05043.84
5.4.430.0130.05043.78
5.4.420.0170.04743.77
5.4.410.0600.02743.77
5.4.400.0430.03043.77
5.4.390.0330.04743.77
5.4.380.0070.06018.56
5.4.370.0130.05318.61
5.4.360.0130.05018.66
5.4.350.0200.05318.61
5.4.340.0170.05018.59
5.4.320.0070.03512.45
5.4.310.0040.03912.45
5.4.300.0070.03612.45
5.4.290.0050.04112.45
5.4.280.0070.03512.35
5.4.270.0050.03812.35
5.4.260.0040.04212.34
5.4.250.0060.03712.34
5.4.240.0040.03812.35
5.4.230.0060.03712.34
5.4.220.0080.03412.34
5.4.210.0120.04212.34
5.4.200.0060.03812.34
5.4.190.0090.03912.33
5.4.180.0080.03612.33
5.4.170.0050.04212.35
5.4.160.0040.03812.34
5.4.150.0060.03512.34
5.4.140.0060.03712.02
5.4.130.0050.03712.01
5.4.120.0110.03211.96
5.4.110.0070.03411.96
5.4.100.0100.03711.96
5.4.90.0060.03711.96
5.4.80.0050.03811.96
5.4.70.0110.02911.96
5.4.60.0020.03811.96
5.4.50.0050.03511.96
5.4.40.0060.03411.95
5.4.30.0050.04211.94
5.4.20.0060.03911.95
5.4.10.0050.03511.95
5.4.00.0070.03511.43
5.3.290.0060.04212.80
5.3.280.0060.03812.71
5.3.270.0020.04212.73
5.3.260.0090.03912.71
5.3.250.0040.04212.72
5.3.240.0070.03612.72
5.3.230.0040.03912.71
5.3.220.0010.04212.68
5.3.210.0040.04612.68
5.3.200.0100.03312.68
5.3.190.0100.03812.68
5.3.180.0110.03412.67
5.3.170.0090.03512.66
5.3.160.0090.03312.67
5.3.150.0080.03512.67
5.3.140.0050.03812.66
5.3.130.0060.04012.66
5.3.120.0090.03612.66
5.3.110.0070.03812.66
5.3.100.0090.04112.12
5.3.90.0040.03912.09
5.3.80.0060.03612.08
5.3.70.0070.04312.08
5.3.60.0100.03612.06
5.3.50.0070.04012.00
5.3.40.0040.04412.00
5.3.30.0060.03811.94
5.3.20.0080.04211.72
5.3.10.0080.04211.69
5.3.00.0070.04011.67
5.2.170.0060.0329.18
5.2.160.0030.0309.18
5.2.150.0050.0299.18
5.2.140.0050.0309.18
5.2.130.0060.0289.14
5.2.120.0050.0349.14
5.2.110.0080.0269.14
5.2.100.0080.0319.14
5.2.90.0040.0309.14
5.2.80.0070.0339.13
5.2.70.0060.0409.13
5.2.60.0060.0329.09
5.2.50.0060.0309.05
5.2.40.0040.0309.03
5.2.30.0040.0319.01
5.2.20.0030.0319.00
5.2.10.0050.0348.92
5.2.00.0050.0318.77
5.1.60.0040.0248.06
5.1.50.0080.0258.05
5.1.40.0040.0278.04
5.1.30.0050.0258.39
5.1.20.0080.0318.41
5.1.10.0080.0228.13
5.1.00.0070.0308.13
5.0.50.0060.0236.61
5.0.40.0040.0186.48
5.0.30.0020.0326.29
5.0.20.0070.0216.26
5.0.10.0040.0206.24
5.0.00.0020.0326.23
4.4.90.0050.0244.78
4.4.80.0050.0214.75
4.4.70.0020.0224.76
4.4.60.0020.0174.76
4.4.50.0030.0154.77
4.4.40.0020.0264.71
4.4.30.0030.0194.76
4.4.20.0030.0194.85
4.4.10.0050.0164.85
4.4.00.0030.0274.76
4.3.110.0040.0144.67
4.3.100.0010.0174.66
4.3.90.0040.0134.63
4.3.80.0050.0274.58
4.3.70.0050.0184.63
4.3.60.0020.0154.63
4.3.50.0030.0154.63
4.3.40.0040.0234.54
4.3.30.0020.0223.28
4.3.20.0030.0223.26
4.3.10.0000.0173.22
4.3.00.0070.01743.76

preferences:
38.9 ms | 401 KiB | 5 Q