3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(substr('a', 0, 2)); // string(1) "a" var_dump(substr('', 0, 2)); // bool(false) var_dump(substr('a', 1)); // bool(false)

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)
8.3.70.0030.01416.38
8.3.60.0200.00018.30
8.3.50.0100.00921.14
8.3.40.0090.00618.39
8.3.30.0040.01118.64
8.3.20.0070.00018.44
8.3.10.0090.00021.74
8.3.00.0080.00020.88
8.2.190.0070.00716.58
8.2.180.0060.01218.29
8.2.170.0140.00322.96
8.2.160.0070.00718.96
8.2.150.0040.00425.66
8.2.140.0040.00424.66
8.2.130.0070.00020.95
8.2.120.0000.00726.35
8.2.110.0060.00320.39
8.2.100.0080.00417.91
8.2.90.0040.00418.95
8.2.80.0000.00917.97
8.2.70.0050.00317.38
8.2.60.0000.00817.91
8.2.50.0040.00418.10
8.2.40.0080.00022.07
8.2.30.0070.00020.55
8.2.20.0040.00417.52
8.2.10.0040.00417.92
8.2.00.0070.00017.98
8.1.280.0040.01225.92
8.1.270.0040.00423.96
8.1.260.0040.00428.09
8.1.250.0040.00428.09
8.1.240.0080.00823.84
8.1.230.0040.00719.09
8.1.220.0000.00817.74
8.1.210.0060.00318.77
8.1.200.0000.00917.10
8.1.190.0080.00017.00
8.1.180.0000.00918.10
8.1.170.0080.00018.55
8.1.160.0000.00718.94
8.1.150.0000.00718.78
8.1.140.0040.00419.43
8.1.130.0030.00517.64
8.1.120.0040.00417.33
8.1.110.0000.00717.22
8.1.100.0030.00517.21
8.1.90.0070.00017.34
8.1.80.0040.00417.29
8.1.70.0000.00817.34
8.1.60.0030.00717.31
8.1.50.0040.00417.34
8.1.40.0040.00417.29
8.1.30.0040.00417.52
8.1.20.0040.00417.50
8.1.10.0000.00717.25
8.1.00.0040.00417.27
8.0.300.0070.00018.77
8.0.290.0040.00416.63
8.0.280.0070.00018.25
8.0.270.0070.00017.13
8.0.260.0000.00616.99
8.0.250.0000.00716.87
8.0.240.0000.00916.92
8.0.230.0030.00316.72
8.0.220.0030.00316.66
8.0.210.0000.00916.77
8.0.200.0040.00416.81
8.0.190.0080.00016.80
8.0.180.0040.00416.75
8.0.170.0050.00316.75
8.0.160.0030.00516.75
8.0.150.0000.00716.70
8.0.140.0040.00416.70
8.0.130.0050.00013.14
8.0.120.0000.00816.73
8.0.110.0040.00416.73
8.0.100.0000.00816.82
8.0.90.0070.00016.54
8.0.80.0060.00916.80
8.0.70.0030.00516.66
8.0.60.0040.00416.79
8.0.50.0070.00016.77
8.0.30.0100.01016.86
8.0.20.0100.01217.40
8.0.10.0040.00416.84
8.0.00.0090.00916.55
7.4.330.0060.00015.08
7.4.320.0060.00016.39
7.4.300.0000.00716.25
7.4.290.0040.00416.51
7.4.280.0070.00016.47
7.4.270.0060.00016.35
7.4.260.0040.00416.25
7.4.250.0040.00416.34
7.4.240.0040.00316.28
7.4.230.0000.00716.37
7.4.220.0060.00916.44
7.4.210.0120.00316.55
7.4.200.0030.00316.57
7.4.160.0030.01316.38
7.4.150.0190.00417.40
7.4.140.0110.00717.86
7.4.130.0090.00916.32
7.4.120.0080.01116.36
7.4.110.0080.00816.22
7.4.100.0140.00516.20
7.4.90.0120.00616.32
7.4.80.0130.01119.39
7.4.70.0090.01216.43
7.4.60.0060.01016.44
7.4.50.0040.01116.14
7.4.40.0030.01316.27
7.4.30.0030.01516.18
7.4.00.0100.00414.72
7.3.330.0030.00313.04
7.3.320.0000.00512.89
7.3.310.0000.00716.00
7.3.300.0040.00416.04
7.3.290.0090.00816.08
7.3.280.0080.00916.12
7.3.270.0130.00417.40
7.3.260.0110.00716.34
7.3.250.0100.00916.20
7.3.240.0110.00516.19
7.3.230.0100.00616.42
7.3.210.0060.01016.27
7.3.200.0120.00616.40
7.3.190.0120.00516.09
7.3.180.0000.01516.17
7.3.170.0110.01116.30
7.3.160.0090.00616.38
7.3.120.0060.01314.54
7.3.110.0110.00714.58
7.3.100.0050.01114.68
7.3.90.0050.00814.73
7.3.80.0040.01114.91
7.3.70.0070.00314.72
7.3.60.0050.01114.69
7.3.50.0090.00614.64
7.3.40.0060.00714.71
7.3.30.0050.01014.64
7.3.20.0030.00816.61
7.3.10.0030.01216.58
7.3.00.0060.00916.52
7.2.330.0160.01016.45
7.2.320.0150.00316.16
7.2.310.0170.00616.52
7.2.300.0100.00616.45
7.2.290.0060.00916.21
7.2.250.0090.01114.49
7.2.240.0030.01514.79
7.2.230.0050.00914.93
7.2.220.0050.00814.69
7.2.210.0060.01014.85
7.2.200.0070.00514.93
7.2.190.0080.00814.58
7.2.180.0070.01014.84
7.2.170.0050.01014.95
7.2.60.0090.00616.63
7.2.00.0030.00619.28
7.1.330.0070.00715.38
7.1.320.0050.00715.68
7.1.310.0030.00915.61
7.1.300.0070.00515.71
7.1.290.0010.01415.46
7.1.280.0050.00715.68
7.1.270.0070.00715.72
7.1.260.0000.01615.65
7.1.200.0140.00015.71
7.1.100.0060.00617.91
7.1.70.0000.01017.15
7.1.60.0100.01420.41
7.1.50.0040.01516.88
7.1.00.0030.07722.49
7.0.200.0390.00714.74
7.0.80.0470.04719.92
7.0.70.0500.04319.92
7.0.60.0600.04019.94
7.0.50.0630.07720.34
7.0.40.0000.05720.19
7.0.30.0100.07720.14
7.0.20.0070.08020.13
7.0.10.0070.06720.10
7.0.00.0000.09320.05
5.6.280.0100.06720.88
5.6.230.0130.07320.67
5.6.220.0200.07020.67
5.6.210.0100.08320.65
5.6.200.0070.08020.93
5.6.190.0030.09321.05
5.6.180.0070.06321.05
5.6.170.0070.08021.07
5.6.160.0230.06721.04
5.6.150.0070.08720.95
5.6.140.0100.08021.12
5.6.130.0070.06020.93
5.6.120.0070.05021.16
5.6.110.0030.07020.98
5.6.100.0130.08021.04
5.6.90.0130.07021.08
5.6.80.0130.04020.34
5.6.70.0100.06720.40
5.6.60.0070.05720.37
5.6.50.0230.05720.51
5.6.40.0170.04720.30
5.6.30.0130.04020.40
5.6.20.0200.07020.47
5.6.10.0100.07720.46
5.6.00.0070.05020.47
5.5.370.0070.08720.35
5.5.360.0000.05020.43
5.5.350.0030.05320.37
5.5.340.0100.08020.82
5.5.330.0170.04020.84
5.5.320.0100.08720.75
5.5.310.0170.08020.92
5.5.300.0070.08020.88
5.5.290.0030.08320.76
5.5.280.0030.08320.92
5.5.270.0070.05720.86
5.5.260.0130.07320.87
5.5.250.0130.08020.66
5.5.240.0130.08020.30
5.5.230.0100.08020.14
5.5.220.0000.06720.19
5.5.210.0130.07020.27
5.5.200.0100.05020.24
5.5.190.0100.04720.23
5.5.180.0030.08020.21
5.5.160.0100.07719.98
5.5.150.0130.07020.23
5.5.140.0070.08020.11
5.5.130.0130.07020.26
5.5.120.0100.07320.12
5.5.110.0100.08020.25
5.5.100.0130.07319.95
5.5.90.0130.06020.11
5.5.80.0100.08320.05
5.5.70.0130.07720.10
5.5.60.0070.07020.03
5.5.50.0130.07320.08
5.5.40.0100.07720.04
5.5.30.0100.08019.95
5.5.20.0030.08020.01
5.5.10.0070.08020.11
5.5.00.0170.07020.11

preferences:
63.4 ms | 401 KiB | 5 Q