3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = ''; var_dump(substr($str,0,1));

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)
8.3.40.0030.01718.70
8.3.30.0070.00718.59
8.3.20.0000.00718.59
8.3.10.0060.00318.62
8.3.00.0080.00019.25
8.2.170.0090.00622.96
8.2.160.0150.00018.55
8.2.150.0080.00024.18
8.2.140.0050.00324.66
8.2.130.0080.00026.16
8.2.120.0040.00420.57
8.2.110.0030.00722.25
8.2.100.0120.00017.78
8.2.90.0030.00617.91
8.2.80.0000.01117.97
8.2.70.0060.00317.49
8.2.60.0040.00417.80
8.2.50.0060.00317.80
8.2.40.0060.00319.95
8.2.30.0000.00817.61
8.2.20.0020.00817.55
8.2.10.0070.00017.49
8.2.00.0030.00717.55
8.1.270.0040.00423.99
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0110.00818.93
8.1.230.0040.00720.99
8.1.220.0050.00317.74
8.1.210.0090.00018.95
8.1.200.0060.00317.23
8.1.190.0040.00417.23
8.1.180.0090.00018.10
8.1.170.0000.00717.62
8.1.160.0040.00419.05
8.1.150.0050.00218.61
8.1.140.0040.00417.38
8.1.130.0070.00017.82
8.1.120.0070.00017.25
8.1.110.0040.00417.26
8.1.100.0070.00017.44
8.1.90.0000.00717.40
8.1.80.0030.00417.39
8.1.70.0050.00317.36
8.1.60.0000.00817.52
8.1.50.0080.00017.46
8.1.40.0040.00417.50
8.1.30.0040.00417.54
8.1.20.0080.00317.48
8.1.10.0040.00417.41
8.1.00.0080.00017.39
8.0.300.0070.00019.99
8.0.290.0050.00216.63
8.0.280.0020.00518.59
8.0.270.0070.00017.09
8.0.260.0030.00318.43
8.0.250.0020.00516.86
8.0.240.0040.00416.77
8.0.230.0060.00216.85
8.0.220.0030.00316.86
8.0.210.0030.00316.66
8.0.200.0070.00016.79
8.0.190.0030.00316.83
8.0.180.0080.00416.71
8.0.170.0090.00016.73
8.0.160.0000.00716.72
8.0.150.0080.00016.77
8.0.140.0050.00516.69
8.0.130.0000.00513.24
8.0.120.0060.00316.89
8.0.110.0000.00716.82
8.0.100.0000.00716.80
8.0.90.0000.00716.73
8.0.80.0060.00916.73
8.0.70.0000.00916.77
8.0.60.0030.00516.71
8.0.50.0030.00516.77
8.0.30.0000.01617.17
8.0.20.0090.01117.02
8.0.10.0040.00416.90
8.0.00.0110.00916.71
7.4.330.0030.00312.97
7.4.320.0030.00316.44
7.4.300.0030.00316.42
7.4.290.0060.00016.49
7.4.280.0030.00516.52
7.4.270.0040.00416.43
7.4.260.0000.00513.21
7.4.250.0050.00316.43
7.4.240.0000.00716.39
7.4.230.0050.00216.51
7.4.220.0220.01216.43
7.4.210.0100.00716.46
7.4.200.0040.00416.55
7.4.190.0030.00316.59
7.4.160.0120.01216.44
7.4.150.0070.01816.59
7.4.140.0120.00416.37
7.4.130.0090.00916.25
7.4.120.0080.00816.39
7.4.110.0150.00416.37
7.4.100.0110.01116.45
7.4.90.0070.01016.44
7.4.80.0170.00316.46
7.4.70.0100.00716.29
7.4.60.0070.01016.53
7.4.50.0080.00016.57
7.4.40.0060.00916.27
7.4.30.0000.01716.43
7.4.10.0000.01414.94
7.4.00.0060.00614.89
7.3.330.0060.00013.07
7.3.320.0000.00512.95
7.3.310.0030.00316.05
7.3.300.0000.00716.15
7.3.290.0080.00816.12
7.3.280.0130.00116.13
7.3.270.0070.01016.14
7.3.260.0200.00016.35
7.3.250.0110.00816.21
7.3.240.0030.01416.17
7.3.230.0140.00316.25
7.3.210.0070.01016.16
7.3.200.0060.00916.21
7.3.190.0150.00616.38
7.3.180.0000.01716.32
7.3.170.0100.00716.22
7.3.160.0090.00616.31
7.3.130.0110.00714.98
7.3.120.0060.01014.76
7.3.110.0000.01914.73
7.3.100.0030.01314.89
7.3.90.0070.01114.54
7.3.80.0100.01014.97
7.3.70.0100.00514.46
7.3.60.0030.00714.61
7.3.50.0060.00914.79
7.3.40.0000.01714.65
7.3.30.0030.01214.46
7.3.20.0060.00616.53
7.3.10.0070.00716.37
7.3.00.0050.00916.51
7.2.330.0120.00616.65
7.2.320.0100.00716.44
7.2.310.0030.01716.54
7.2.300.0100.00616.52
7.2.290.0140.00316.30
7.2.260.0000.01615.00
7.2.250.0030.01314.99
7.2.240.0120.00315.04
7.2.230.0070.01114.98
7.2.220.0060.01314.87
7.2.210.0070.00314.98
7.2.200.0060.00914.67
7.2.190.0000.01214.85
7.2.180.0040.00414.88
7.2.170.0000.01314.67
7.2.160.0000.01014.97
7.2.150.0060.00316.89
7.2.140.0070.00716.62
7.2.130.0080.00516.69
7.2.120.0050.01016.43
7.2.110.0030.01016.74
7.2.100.0040.00616.61
7.2.90.0060.00816.63
7.2.80.0040.00716.64
7.2.70.0080.00516.84
7.2.60.0040.00916.72
7.2.50.0060.00916.79
7.2.40.0050.00816.83
7.2.30.0060.00816.62
7.2.20.0080.00516.76
7.2.10.0100.00316.71
7.2.00.0040.01116.60
7.1.330.0040.01115.82
7.1.320.0090.00615.50
7.1.310.0070.01015.41
7.1.300.0130.00015.35
7.1.290.0000.01515.59
7.1.280.0070.00715.75
7.1.270.0060.00615.46
7.1.260.0070.00715.51
7.1.250.0060.00715.51
7.1.240.0110.00415.77
7.1.230.0060.00615.72
7.1.220.0030.01315.50
7.1.210.0130.00315.83
7.1.200.0060.00715.75
7.1.190.0040.01115.53
7.1.180.0000.01415.57
7.1.170.0030.00615.79
7.1.160.0040.00815.83
7.1.150.0070.00715.62
7.1.140.0030.01015.78
7.1.130.0060.00915.74
7.1.120.0030.01315.54
7.1.110.0000.01315.80
7.1.100.0100.00315.43
7.1.90.0120.00615.72
7.1.80.0000.01315.70
7.1.70.0050.00716.49
7.1.60.0080.00817.41
7.1.50.0020.01016.26
7.1.40.0060.00615.84
7.1.30.0100.00015.57
7.1.20.0070.00715.73
7.1.10.0030.00615.84
7.1.00.0040.04419.17
7.0.330.0030.00715.23
7.0.320.0070.01015.30
7.0.310.0030.01015.27
7.0.300.0060.00615.30
7.0.290.0100.00315.24
7.0.280.0070.00315.04
7.0.270.0090.00615.19
7.0.260.0030.01315.40
7.0.250.0080.00315.12
7.0.240.0100.00315.41
7.0.230.0040.01115.21
7.0.220.0080.00015.46
7.0.210.0030.00615.34
7.0.200.0050.00515.98
7.0.190.0030.01015.48
7.0.180.0100.00615.27
7.0.170.0060.00915.40
7.0.160.0070.00715.45
7.0.150.0090.00315.36
7.0.140.0060.03818.74
7.0.130.0070.00715.35
7.0.120.0050.02618.77
7.0.110.0040.00815.42
7.0.100.0000.01215.16
7.0.90.0030.01015.44
7.0.80.0040.00415.52
7.0.70.0070.00715.23
7.0.60.0050.04218.59
7.0.50.0050.03716.45
7.0.40.0050.04516.61
7.0.30.0180.03516.73
7.0.20.0160.02816.77
7.0.10.0090.02216.59
7.0.00.0070.04516.64
5.6.400.0060.01214.59
5.6.390.0060.00314.32
5.6.380.0100.00614.42
5.6.370.0090.00314.55
5.6.360.0070.00714.25
5.6.350.0050.00514.52
5.6.340.0040.00714.20
5.6.330.0040.01213.84
5.6.320.0120.00314.19
5.6.310.0090.00614.30
5.6.300.0040.01114.30
5.6.290.0090.00914.28
5.6.280.0020.04217.63
5.6.270.0040.00714.05
5.6.260.0030.00914.18
5.6.250.0000.01614.15
5.6.240.0060.00614.13
5.6.230.0000.00913.99
5.6.220.0030.00714.25
5.6.210.0040.03817.36
5.6.200.0030.02816.13
5.6.190.0080.03517.27
5.6.180.0070.02517.38
5.6.170.0140.02417.27
5.6.160.0030.03117.39
5.6.150.0080.02316.16
5.6.140.0070.03716.09
5.6.130.0050.04916.22
5.6.120.0060.04617.57
5.6.110.0050.04917.49
5.6.100.0050.02517.57
5.6.90.0080.04717.51
5.6.80.0070.04217.15
5.6.70.0040.01114.00
5.6.60.0040.00714.18
5.6.50.0070.00714.18
5.6.40.0060.01213.92
5.6.30.0040.00414.34
5.6.20.0000.01414.22
5.6.10.0120.00614.16
5.6.00.0070.00314.24
5.5.380.0060.00613.75
5.5.370.0040.00714.20
5.5.360.0140.00014.38
5.5.350.0020.04417.31
5.5.340.0030.02416.00
5.5.330.0060.05017.19
5.5.320.0200.02517.17
5.5.310.0170.04317.02
5.5.300.0070.04216.11
5.5.290.0080.02316.01
5.5.280.0080.04117.34
5.5.270.0110.03817.32
5.5.260.0050.04317.49
5.5.250.0060.04617.36
5.5.240.0160.03617.01
5.5.230.0030.01313.84
5.5.220.0070.00713.96
5.5.210.0060.00913.84
5.5.200.0030.00913.72
5.5.190.0000.01314.10
5.5.180.0070.01013.89
5.5.170.0070.01113.80
5.5.160.0060.00314.09
5.5.150.0070.00713.84
5.5.140.0070.00314.11
5.5.130.0060.00914.04
5.5.120.0070.00714.15
5.5.110.0100.00714.13
5.5.100.0030.00613.95
5.5.90.0060.01214.23
5.5.80.0030.01014.11
5.5.70.0060.00913.73
5.5.60.0060.00913.82
5.5.50.0000.00814.11
5.5.40.0000.01314.08
5.5.30.0060.00613.83
5.5.20.0040.01114.07
5.5.10.0030.00614.10
5.5.00.0060.00914.08
5.4.450.0070.04215.09
5.4.440.0020.03015.12
5.4.430.0060.03814.86
5.4.420.0090.03915.12
5.4.410.0070.03815.16
5.4.400.0030.02614.97
5.4.390.0050.03714.80
5.4.380.0080.03314.99
5.4.370.0030.02714.75
5.4.360.0060.02114.84
5.4.350.0050.04314.95
5.4.340.0110.03014.96
5.4.330.0030.00310.88
5.4.320.0030.03014.94
5.4.310.0030.04614.89
5.4.300.0050.02514.90
5.4.290.0030.03214.83
5.4.280.0070.02114.96
5.4.270.0120.03514.84
5.4.260.0100.02214.89
5.4.250.0050.03414.65
5.4.240.0030.03514.92
5.4.230.0000.03114.89
5.4.220.0030.02514.93
5.4.210.0050.03614.91
5.4.200.0060.03615.09
5.4.190.0090.03714.88
5.4.180.0030.02314.85
5.4.170.0040.03414.84
5.4.160.0050.02014.63
5.4.150.0030.02414.92
5.4.140.0000.02313.50
5.4.130.0030.02213.50
5.4.120.0050.03113.75
5.4.110.0040.02913.53
5.4.100.0050.04013.44
5.4.90.0080.03913.46
5.4.80.0030.04513.62
5.4.70.0020.04113.54
5.4.60.0050.04313.53
5.4.50.0000.03913.53
5.4.40.0070.02213.64
5.4.30.0020.03013.62
5.4.20.0020.04213.46
5.4.10.0030.02213.67
5.4.00.0110.03513.31
5.3.290.0080.02012.52
5.3.280.0070.04012.45
5.3.270.0020.03012.43
5.3.260.0030.04212.44
5.3.250.0020.04612.45
5.3.240.0070.04012.38
5.3.230.0030.04312.40
5.3.220.0130.03112.41
5.3.210.0050.03512.41
5.3.200.0050.02512.37
5.3.190.0050.04112.36
5.3.180.0030.04512.39
5.3.170.0070.03512.37
5.3.160.0050.03512.41
5.3.150.0080.02312.49
5.3.140.0080.02412.43
5.3.130.0020.04412.35
5.3.120.0090.02412.44
5.3.110.0050.04012.41
5.3.100.0100.03812.24
5.3.90.0100.02212.10
5.3.80.0040.03312.09
5.3.70.0020.02512.02
5.3.60.0020.02512.16
5.3.50.0080.03212.01
5.3.40.0000.03911.98
5.3.30.0090.02312.10
5.3.20.0020.02612.02
5.3.10.0080.02811.80
5.3.00.0120.03511.94
5.2.170.0030.05011.04
5.2.160.0000.04011.29
5.2.150.0030.04311.09
5.2.140.0030.03011.07
5.2.130.0030.05311.27
5.2.120.0070.06311.06
5.2.110.0070.05710.98
5.2.100.0030.04010.92
5.2.90.0070.06311.09
5.2.80.0030.04311.03
5.2.70.0100.05311.02
5.2.60.0070.05710.97
5.2.50.0000.04011.16
5.2.40.0070.04010.87
5.2.30.0000.06710.94
5.2.20.0100.05710.94
5.2.10.0070.05010.74
5.2.00.0100.04010.66
5.1.60.0030.03010.06
5.1.50.0000.0579.98
5.1.40.0130.03710.02
5.1.30.0070.05310.34
5.1.20.0100.05010.34
5.1.10.0030.04010.07
5.1.00.0000.05310.07
5.0.50.0030.0438.51
5.0.40.0030.0438.38
5.0.30.0070.0708.29
5.0.20.0070.0408.29
5.0.10.0030.0278.29
5.0.00.0000.0438.29
4.4.90.0030.0238.29
4.4.80.0000.0378.29
4.4.70.0030.0278.29
4.4.60.0000.0208.29
4.4.50.0000.0408.29
4.4.40.0070.0478.29
4.4.30.0070.0308.29
4.4.20.0070.0308.29
4.4.10.0030.0378.29
4.4.00.0000.0378.29
4.3.110.0000.0278.29
4.3.100.0000.0408.29
4.3.90.0070.0278.29
4.3.80.0000.0278.29
4.3.70.0030.0138.29
4.3.60.0000.0238.29
4.3.50.0000.0408.29
4.3.40.0070.0478.29
4.3.30.0000.0308.29
4.3.20.0030.0378.29
4.3.10.0070.0278.29
4.3.00.0000.0308.29

preferences:
47.13 ms | 400 KiB | 5 Q