3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(mb_substr('HelloIamastring', 6, NULL, 'UTF-8')); var_dump(mb_substr('HelloIamastring', 6, NULL)); var_dump(mb_substr('HelloIamastring', 6));

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)
8.3.60.0140.00316.60
8.3.50.0090.00618.02
8.3.40.0100.00718.62
8.3.30.0110.00318.91
8.3.20.0110.00320.08
8.3.10.0070.00021.82
8.3.00.0150.00019.13
8.2.180.0120.00318.29
8.2.170.0070.00722.96
8.2.160.0130.00318.93
8.2.150.0040.00424.18
8.2.140.0050.00324.66
8.2.130.0040.00426.16
8.2.120.0080.00019.11
8.2.110.0060.00320.54
8.2.100.0040.00717.78
8.2.90.0040.00417.93
8.2.80.0040.00417.97
8.2.70.0080.00017.65
8.2.60.0080.00017.68
8.2.50.0050.00318.10
8.2.40.0060.00320.57
8.2.30.0070.00017.97
8.2.20.0040.00317.42
8.2.10.0030.00517.80
8.2.00.0050.00217.54
8.1.270.0050.00320.44
8.1.260.0060.00326.35
8.1.250.0080.00028.09
8.1.240.0040.00423.98
8.1.230.0030.00719.16
8.1.220.0090.00017.74
8.1.210.0060.00318.77
8.1.200.0060.00317.10
8.1.190.0040.00417.00
8.1.180.0000.00818.10
8.1.170.0030.00518.50
8.1.160.0040.00421.97
8.1.150.0000.00718.80
8.1.140.0080.00017.31
8.1.130.0070.00017.75
8.1.120.0000.00717.38
8.1.110.0040.00417.16
8.1.100.0050.00217.31
8.1.90.0030.00417.32
8.1.80.0040.00417.28
8.1.70.0000.00717.29
8.1.60.0050.00317.39
8.1.50.0080.00017.36
8.1.40.0060.00317.34
8.1.30.0000.00817.54
8.1.20.0000.00717.64
8.1.10.0040.00417.45
8.1.00.0040.00417.41
8.0.300.0030.00719.69
8.0.290.0080.00016.58
8.0.280.0070.00018.41
8.0.270.0000.00717.23
8.0.260.0000.00617.18
8.0.250.0070.00016.74
8.0.240.0070.00016.77
8.0.230.0000.00716.89
8.0.220.0000.00716.76
8.0.210.0030.00516.85
8.0.200.0030.00316.83
8.0.190.0070.00016.74
8.0.180.0040.00416.73
8.0.170.0040.00416.81
8.0.160.0000.00716.75
8.0.150.0080.00016.80
8.0.140.0030.00316.65
8.0.130.0060.00013.23
8.0.120.0040.00416.69
8.0.110.0040.00416.82
8.0.100.0070.00016.77
8.0.90.0000.00716.64
8.0.80.0060.00916.87
8.0.70.0070.00016.79
8.0.60.0020.00516.78
8.0.50.0040.00416.80
8.0.30.0120.01016.87
8.0.20.0130.00617.40
8.0.10.0040.00416.77
8.0.00.0140.00616.60
7.4.330.0030.00315.03
7.4.320.0000.00716.26
7.4.300.0060.00016.34
7.4.290.0030.00316.37
7.4.280.0000.00916.46
7.4.270.0030.00316.43
7.4.260.0000.00716.34
7.4.250.0000.00716.31
7.4.240.0050.00216.50
7.4.230.0040.00416.56
7.4.220.0120.00616.50
7.4.210.0060.01116.43
7.4.200.0000.00716.34
7.4.160.0080.00816.14
7.4.150.0030.01417.40
7.4.140.0130.00917.86
7.4.130.0050.01216.35
7.4.120.0080.00916.33
7.4.110.0090.01516.45
7.4.100.0060.01216.14
7.4.90.0030.01316.09
7.4.80.0170.00319.39
7.4.70.0120.00816.41
7.4.60.0090.01216.29
7.4.50.0040.00016.52
7.4.40.0100.00716.44
7.4.30.0090.01216.32
7.4.00.0040.01214.95
7.3.330.0060.00013.05
7.3.320.0100.00312.96
7.3.310.0040.00416.05
7.3.300.0070.00016.09
7.3.290.0030.00316.10
7.3.280.0090.00816.11
7.3.270.0000.01817.40
7.3.260.0120.00616.39
7.3.250.0100.00716.18
7.3.240.0120.00416.42
7.3.230.0120.00616.43
7.3.210.0060.01016.16
7.3.200.0120.00819.39
7.3.190.0060.01316.37
7.3.180.0050.01016.10
7.3.170.0160.00616.34
7.3.160.0140.00316.42
7.2.330.0120.00616.46
7.2.320.0080.00816.17
7.2.310.0100.00716.52
7.2.300.0060.01116.16
7.2.290.0090.00816.46
7.2.00.0030.01218.98
7.1.100.0000.00918.02
7.1.70.0040.00417.17
7.1.60.0040.01519.50
7.1.50.0120.00916.75
7.1.00.0030.07722.51
7.0.200.0570.00414.48
7.0.140.0070.07322.21
7.0.60.0000.08319.77
7.0.50.0030.05317.89
7.0.40.0030.08720.04
7.0.30.0370.08020.17
7.0.20.0230.06320.30
7.0.10.0330.04020.19
7.0.00.0100.04320.08
5.6.280.0070.07021.09
5.6.210.0100.07720.61
5.6.200.0130.05318.16
5.6.190.0200.07320.67
5.6.180.0170.06720.23
5.6.170.0370.08020.50
5.6.160.0130.07020.52
5.6.150.0100.08018.18
5.6.140.0130.07018.12
5.6.130.0070.08318.18
5.6.120.0070.05720.99
5.6.110.0070.04021.13
5.6.100.0100.05721.00
5.6.90.0030.05720.99
5.6.80.0100.07320.25
5.6.70.0270.07020.41
5.5.350.0130.07020.43
5.5.340.0070.03717.88
5.5.330.0000.05020.57
5.5.320.0100.04320.40
5.5.310.0400.06020.30
5.5.300.0100.07317.91
5.5.290.0000.04717.93
5.5.280.0130.03020.94
5.5.270.0030.04320.75
5.5.260.0030.05320.78
5.5.250.0170.07020.46
5.5.240.0130.05720.18
5.4.450.0630.06719.59
5.4.440.0870.06019.27
5.4.430.0970.07019.46
5.4.420.0100.06319.10
5.4.410.0970.06019.48
5.4.400.0170.05718.51
5.4.390.0270.06718.61
5.4.380.0170.06018.69
5.4.370.0130.06018.61
5.4.360.0270.04718.74
5.4.350.0170.06018.69
5.4.340.0070.06718.68
5.4.320.0330.05018.50
5.4.310.0300.04318.46
5.4.300.0330.04018.49
5.4.290.0270.05018.61
5.4.280.0230.04718.48
5.4.270.0200.05718.57
5.4.260.0070.07018.49
5.4.250.0200.05318.67
5.4.240.0170.06718.52
5.4.230.0200.05318.77
5.4.220.0300.04318.47
5.4.210.0230.05318.76
5.4.200.0100.05316.53
5.4.190.0270.06718.67
5.4.180.0230.07018.60
5.4.170.0170.05718.57
5.4.160.0230.05018.74
5.4.150.0070.06318.71
5.4.140.0230.05016.17
5.4.130.0230.04316.16
5.4.120.0230.04716.26
5.4.110.0200.04716.30
5.4.100.0200.05016.25
5.4.90.0330.04016.19
5.4.80.0070.06016.08
5.4.70.0170.05016.18
5.4.60.0100.05716.04
5.4.50.0200.04716.21
5.4.40.0130.05316.06
5.4.30.0200.04316.18
5.4.20.0200.05016.10
5.4.10.0170.05016.18
5.4.00.0230.04015.67
5.3.290.0230.05314.75
5.3.280.0200.05314.52
5.3.270.0070.06314.51
5.3.260.0200.05014.59
5.3.250.0300.05714.59
5.3.240.0170.05314.51
5.3.230.0100.06314.57
5.3.220.0130.05314.56
5.3.210.0170.05314.49
5.3.200.0170.05014.47
5.3.190.0170.05314.51
5.3.180.0100.06014.47
5.3.170.0270.04314.48
5.3.160.0070.06314.49
5.3.150.0200.05014.48
5.3.140.0200.06314.46
5.3.130.0200.07014.61
5.3.120.0230.05014.57
5.3.110.0230.04714.61
5.3.100.0130.05314.05
5.3.90.0130.05714.11
5.3.80.0170.06013.95
5.3.70.0300.04713.91
5.3.60.0200.05014.08
5.3.50.0170.05013.90
5.3.40.0100.06713.86
5.3.30.0170.04713.82
5.3.20.0170.05013.68
5.3.10.0100.05313.58
5.3.00.0130.05313.54
5.2.170.0100.04711.18
5.2.160.0170.03711.07
5.2.150.0130.04311.30
5.2.140.0170.03711.05
5.2.130.0130.04711.06
5.2.120.0100.04011.25
5.2.110.0200.03311.03
5.2.100.0070.04311.16
5.2.90.0130.04011.07
5.2.80.0070.04711.06
5.2.70.0230.03011.14
5.2.60.0200.03310.97
5.2.50.0130.04010.93
5.2.40.0170.03311.03
5.2.30.0130.04011.00
5.2.20.0030.04710.93
5.2.10.0100.04011.00
5.2.00.0230.03310.68
5.1.60.0100.04010.10
5.1.50.0070.03710.03
5.1.40.0130.0379.97
5.1.30.0130.04010.37
5.1.20.0070.04710.45
5.1.10.0100.04310.20
5.1.00.0200.02710.03
5.0.50.0130.0238.64
5.0.40.0100.0238.47
5.0.30.0070.0438.27
5.0.20.0130.0238.17
5.0.10.0100.0238.24
5.0.00.0070.0438.18
4.4.90.0030.0236.41
4.4.80.0070.0206.41
4.4.70.0100.0236.41
4.4.60.0100.0206.41
4.4.50.0070.0206.41
4.4.40.0070.0336.41
4.4.30.0070.0236.41
4.4.20.0030.0276.41
4.4.10.0100.0176.41
4.4.00.0100.0376.41
4.3.110.0070.0236.41
4.3.100.0070.0306.41
4.3.90.0170.0206.41
4.3.80.0030.0476.41
4.3.70.0070.0206.41
4.3.60.0100.0276.41
4.3.50.0030.0276.41
4.3.40.0000.0406.41
4.3.30.0000.0306.41
4.3.20.0070.0206.41
4.3.10.0000.0336.41
4.3.00.0130.0206.82

preferences:
62.47 ms | 400 KiB | 5 Q