3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'foobr'; $charFirst = substr($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)
8.3.70.0070.00716.63
8.3.60.0060.00816.38
8.3.50.0080.00821.86
8.3.40.0120.00318.58
8.3.30.0070.00718.96
8.3.20.0040.00420.04
8.3.10.0070.00023.54
8.3.00.0090.00019.77
8.2.180.0120.00316.63
8.2.170.0080.00622.96
8.2.160.0030.01020.39
8.2.150.0040.00424.18
8.2.140.0090.00024.66
8.2.130.0040.00426.16
8.2.120.0090.00019.23
8.2.110.0070.00322.25
8.2.100.0120.00017.71
8.2.90.0000.00819.29
8.2.80.0080.00017.97
8.2.70.0050.00317.63
8.2.60.0040.00717.80
8.2.50.0090.00318.07
8.2.40.0080.00019.88
8.2.30.0000.00718.23
8.2.20.0040.00417.70
8.2.10.0000.00718.02
8.2.00.0070.00017.74
8.1.280.0150.00625.92
8.1.270.0080.00023.99
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0000.00923.92
8.1.230.0040.00719.22
8.1.220.0000.00917.76
8.1.210.0040.00418.77
8.1.200.0060.00317.35
8.1.190.0040.00417.13
8.1.180.0080.00018.10
8.1.170.0000.00818.45
8.1.160.0030.00721.86
8.1.150.0070.00018.61
8.1.140.0030.00517.38
8.1.130.0000.00817.69
8.1.120.0000.00717.37
8.1.110.0070.00017.28
8.1.100.0040.00417.27
8.1.90.0070.00017.43
8.1.80.0030.00517.45
8.1.70.0070.00017.33
8.1.60.0040.00417.43
8.1.50.0040.00417.53
8.1.40.0040.00417.41
8.1.30.0040.00417.60
8.1.20.0040.00417.51
8.1.10.0040.00417.50
8.1.00.0040.00417.43
8.0.300.0000.00718.77
8.0.290.0020.00516.75
8.0.280.0040.00418.39
8.0.270.0030.00317.29
8.0.260.0030.00317.11
8.0.250.0000.00716.82
8.0.240.0050.00516.88
8.0.230.0030.00616.91
8.0.220.0070.00016.93
8.0.210.0000.00716.80
8.0.200.0000.00616.83
8.0.190.0030.00516.84
8.0.180.0080.00016.79
8.0.170.0000.00816.95
8.0.160.0000.00716.82
8.0.150.0050.00316.72
8.0.140.0030.00516.84
8.0.130.0060.00013.29
8.0.120.0000.00716.80
8.0.110.0040.00416.78
8.0.100.0000.00716.93
8.0.90.0040.00416.91
8.0.80.0070.01016.94
8.0.70.0000.00716.93
8.0.60.0040.00416.75
8.0.50.0000.00816.74
8.0.30.0150.00617.09
8.0.20.0140.00917.40
8.0.10.0050.00316.83
8.0.00.0100.00716.74
7.4.330.0020.00215.02
7.4.320.0040.00416.47
7.4.300.0000.00916.35
7.4.290.0040.00416.42
7.4.280.0070.00316.52
7.4.270.0080.00016.58
7.4.260.0030.00316.41
7.4.250.0050.00216.45
7.4.240.0040.00416.52
7.4.230.0030.00316.32
7.4.220.0090.00916.55
7.4.210.0040.01216.44
7.4.200.0050.00216.35
7.4.160.0090.00616.58
7.4.150.0150.00317.40
7.4.140.0140.00417.86
7.4.130.0090.00816.46
7.4.120.0090.00816.52
7.4.110.0100.00716.46
7.4.100.0110.00516.54
7.4.90.0030.01316.48
7.4.80.0120.01219.39
7.4.70.0080.01216.39
7.4.60.0060.01116.53
7.4.50.0050.00316.53
7.4.40.0150.00316.53
7.4.30.0130.00716.34
7.4.00.0040.00414.80
7.3.330.0030.00313.16
7.3.320.0020.00213.05
7.3.310.0040.00416.36
7.3.300.0000.00616.30
7.3.290.0080.00816.27
7.3.280.0100.00616.32
7.3.270.0120.01217.40
7.3.260.0040.01716.54
7.3.250.0080.01116.34
7.3.240.0130.00716.46
7.3.230.0110.00616.48
7.3.210.0130.00316.63
7.3.200.0100.00619.39
7.3.190.0120.00416.44
7.3.180.0070.01016.43
7.3.170.0000.01516.30
7.3.160.0070.01016.21
7.3.120.0130.00014.91
7.2.330.0000.01616.35
7.2.320.0160.00616.62
7.2.310.0160.00716.45
7.2.300.0060.01016.52
7.2.290.0070.00716.57
7.2.60.0090.00916.80
7.2.00.0060.00919.53
7.1.200.0030.00915.66
7.1.100.0060.00617.76
7.1.70.0000.00717.06
7.1.60.0130.00919.70
7.1.50.0030.02116.58
7.1.00.0000.08022.28
7.0.200.0030.01016.68
7.0.140.0070.06722.01
7.0.60.0200.07020.02
7.0.50.0070.06317.80
7.0.40.0070.06020.09
7.0.30.0200.04020.09
7.0.20.0370.07720.16
7.0.10.0030.04720.18
7.0.00.0030.04320.16
5.6.280.0030.07321.03
5.6.210.0100.06020.71
5.6.200.0070.08318.15
5.6.190.0100.03720.63
5.6.180.0270.04720.67
5.6.170.0170.05020.38
5.6.160.0130.07720.46
5.6.150.0070.08018.12
5.6.140.0100.04018.16
5.6.130.0070.05318.04
5.6.120.0000.05020.98
5.6.110.0000.04721.08
5.6.100.0030.06321.12
5.6.90.0170.05020.98
5.6.80.0130.06020.36
5.5.350.0170.08320.40
5.5.340.0100.04718.02
5.5.330.0070.06020.20
5.5.320.0370.05020.24
5.5.310.0270.08020.27
5.5.300.0100.07717.92
5.5.290.0070.04317.84
5.5.280.0100.08020.97
5.5.270.0170.04320.83
5.5.260.0230.07720.72
5.5.250.0030.04020.57
5.5.240.0070.07720.15
5.4.450.0300.04343.92
5.4.440.0500.05043.91
5.4.430.0370.04743.90
5.4.420.0570.04043.89
5.4.410.0130.04743.86
5.4.400.0270.04343.80
5.4.390.0070.04743.79
5.4.380.0470.05018.48
5.4.370.0170.05018.67
5.4.360.0130.05318.68
5.4.350.0200.05018.50
5.4.340.0070.06018.50
5.4.320.0030.03812.45
5.4.310.0040.04012.45
5.4.300.0060.03612.45
5.4.290.0060.04212.45
5.4.280.0030.04112.35
5.4.270.0070.03512.34
5.4.260.0030.04012.34
5.4.250.0070.04212.35
5.4.240.0070.03412.34
5.4.230.0080.04312.34
5.4.220.0060.03712.34
5.4.210.0060.04012.34
5.4.200.0100.03312.34
5.4.190.0080.04012.34
5.4.180.0040.03812.33
5.4.170.0070.03512.34
5.4.160.0060.03612.34
5.4.150.0030.03812.34
5.4.140.0070.04212.02
5.4.130.0070.03712.01
5.4.120.0040.03711.97
5.4.110.0070.04111.96
5.4.100.0030.03811.97
5.4.90.0090.03411.96
5.4.80.0050.03911.96
5.4.70.0050.03511.96
5.4.60.0080.03811.96
5.4.50.0080.04411.96
5.4.40.0070.04111.95
5.4.30.0040.03611.95
5.4.20.0070.03411.95
5.4.10.0050.03511.95
5.4.00.0060.03711.43
5.3.290.0020.04312.80
5.3.280.0100.04212.71
5.3.270.0100.03912.72
5.3.260.0080.03912.72
5.3.250.0050.03712.72
5.3.240.0080.04412.72
5.3.230.0080.03912.71
5.3.220.0060.04012.68
5.3.210.0110.03312.68
5.3.200.0010.04112.68
5.3.190.0060.03812.68
5.3.180.0080.04012.67
5.3.170.0060.04112.67
5.3.160.0040.03812.67
5.3.150.0120.03712.68
5.3.140.0080.03712.66
5.3.130.0040.04212.66
5.3.120.0070.03912.66
5.3.110.0100.03512.66
5.3.100.0110.04112.12
5.3.90.0060.03712.09
5.3.80.0060.03612.07
5.3.70.0040.03812.07
5.3.60.0070.03512.06
5.3.50.0040.03712.00
5.3.40.0090.03312.00
5.3.30.0080.03711.94
5.3.20.0070.03411.72
5.3.10.0070.03411.69
5.3.00.0080.03711.67
5.2.170.0040.0349.18
5.2.160.0080.0339.18
5.2.150.0050.0339.18
5.2.140.0030.0359.17
5.2.130.0060.0299.14
5.2.120.0040.0319.14
5.2.110.0050.0319.14
5.2.100.0040.0309.14
5.2.90.0050.0339.14
5.2.80.0060.0299.14
5.2.70.0040.0319.14
5.2.60.0040.0309.09
5.2.50.0060.0399.06
5.2.40.0080.0339.04
5.2.30.0060.0309.01
5.2.20.0040.0299.00
5.2.10.0030.0308.92
5.2.00.0060.0278.78
5.1.60.0040.0328.06
5.1.50.0040.0318.05
5.1.40.0050.0298.04
5.1.30.0080.0278.39
5.1.20.0030.0278.41
5.1.10.0050.0318.13
5.1.00.0060.0278.13
5.0.50.0020.0226.61
5.0.40.0040.0206.48
5.0.30.0030.0336.29
5.0.20.0030.0216.26
5.0.10.0030.0216.23
5.0.00.0040.0306.22
4.4.90.0010.0174.78
4.4.80.0050.0134.75
4.4.70.0050.0174.75
4.4.60.0040.0174.76
4.4.50.0010.0164.77
4.4.40.0050.0234.71
4.4.30.0040.0144.76
4.4.20.0010.0174.85
4.4.10.0030.0154.85
4.4.00.0010.0264.76
4.3.110.0030.0274.66
4.3.100.0020.0224.67
4.3.90.0010.0224.64
4.3.80.0040.0274.58
4.3.70.0030.0144.63
4.3.60.0040.0154.63
4.3.50.0050.0134.63
4.3.40.0020.0294.54
4.3.30.0020.0223.29
4.3.20.0010.0173.26
4.3.10.0000.0173.22
4.3.00.0000.02343.79

preferences:
49.39 ms | 401 KiB | 5 Q