3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = NULL; $b = ''; echo $a.$b;

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)
8.3.60.0070.01116.38
8.3.50.0100.00921.14
8.3.40.0110.00418.85
8.3.30.0000.01418.54
8.3.20.0080.00019.05
8.3.10.0050.00221.78
8.3.00.0070.00020.61
8.2.180.0110.01118.29
8.2.170.0100.01022.96
8.2.160.0120.00319.29
8.2.150.0070.00024.18
8.2.140.0050.00224.66
8.2.130.0000.00822.26
8.2.120.0000.00726.35
8.2.110.0090.00020.42
8.2.100.0000.01217.67
8.2.90.0030.00519.20
8.2.80.0040.00417.97
8.2.70.0030.00617.63
8.2.60.0080.00018.03
8.2.50.0030.00518.10
8.2.40.0000.00822.40
8.2.30.0100.00019.22
8.2.20.0030.00617.72
8.2.10.0030.00317.98
8.2.00.0070.00018.10
8.1.280.0070.01025.92
8.1.270.0040.00423.96
8.1.260.0040.00428.09
8.1.250.0040.00428.09
8.1.240.0070.00322.25
8.1.230.0080.00317.45
8.1.220.0040.00417.74
8.1.210.0030.00618.77
8.1.200.0040.00417.35
8.1.190.0040.00417.35
8.1.180.0030.00518.10
8.1.170.0040.00418.41
8.1.160.0000.00722.04
8.1.150.0030.00518.86
8.1.140.0030.00619.38
8.1.130.0040.00417.55
8.1.120.0000.00717.39
8.1.110.0070.00017.26
8.1.100.0000.00717.30
8.1.90.0040.00417.29
8.1.80.0080.00017.44
8.1.70.0030.00317.29
8.1.60.0040.00417.43
8.1.50.0000.00817.46
8.1.40.0090.00017.29
8.1.30.0050.00217.60
8.1.20.0020.00517.46
8.1.10.0080.00317.52
8.1.00.0040.00417.39
8.0.300.0000.00718.77
8.0.290.0030.00616.63
8.0.280.0070.00018.35
8.0.270.0000.00817.15
8.0.260.0040.00417.20
8.0.250.0000.00616.94
8.0.240.0030.00316.88
8.0.230.0070.00016.94
8.0.220.0070.00016.78
8.0.210.0030.00316.87
8.0.200.0000.00816.90
8.0.190.0000.00816.95
8.0.180.0070.00016.90
8.0.170.0070.00016.80
8.0.160.0000.00716.84
8.0.150.0030.00416.74
8.0.140.0030.00316.74
8.0.130.0000.00613.30
8.0.120.0040.00416.83
8.0.110.0000.00716.82
8.0.100.0080.00016.89
8.0.90.0030.00616.89
8.0.80.0110.01116.90
8.0.70.0040.00416.91
8.0.60.0000.00716.71
8.0.50.0040.00416.74
8.0.30.0110.00716.98
8.0.20.0100.01117.40
8.0.10.0070.00016.79
8.0.00.0030.01316.93
7.4.330.0000.00615.14
7.4.320.0030.00316.50
7.4.300.0060.00016.50
7.4.290.0000.01116.52
7.4.280.0060.00316.27
7.4.270.0000.00616.45
7.4.260.0070.00016.41
7.4.250.0040.00416.48
7.4.240.0070.00016.45
7.4.230.0030.00316.39
7.4.220.0090.01216.32
7.4.210.0090.00816.56
7.4.200.0000.00716.27
7.4.160.0050.01016.41
7.4.150.0190.00417.40
7.4.140.0060.01117.86
7.4.130.0080.01016.44
7.4.120.0050.01216.53
7.4.110.0040.01916.46
7.4.100.0030.01416.36
7.4.90.0040.02016.40
7.4.80.0130.00519.39
7.4.70.0090.00616.34
7.4.60.0040.01216.43
7.4.50.0100.00716.31
7.4.40.0130.00916.36
7.4.30.0110.01116.56
7.4.00.0080.01214.96
7.3.330.0050.00012.93
7.3.320.0030.00313.06
7.3.310.0070.00016.15
7.3.300.0030.00316.03
7.3.290.0120.00316.16
7.3.280.0090.00916.18
7.3.270.0070.01017.40
7.3.260.0160.00516.39
7.3.250.0080.01216.30
7.3.240.0140.00816.36
7.3.230.0100.01316.39
7.3.210.0060.01616.39
7.3.200.0130.00316.09
7.3.190.0060.01016.22
7.3.180.0080.01216.11
7.3.170.0060.01316.42
7.3.160.0070.01316.50
7.3.120.0030.01314.50
7.3.110.0030.01714.66
7.3.100.0040.01114.77
7.3.90.0100.00014.68
7.3.80.0060.00614.82
7.3.70.0030.00614.75
7.3.60.0070.00714.87
7.3.50.0030.01014.40
7.3.40.0060.00614.71
7.3.30.0110.00414.56
7.3.20.0040.01116.64
7.3.10.0040.00816.57
7.3.00.0130.00316.59
7.2.330.0110.00716.58
7.2.320.0070.01016.49
7.2.310.0100.00716.60
7.2.300.0070.01516.46
7.2.290.0000.01816.61
7.2.250.0040.01414.95
7.2.240.0100.01015.15
7.2.230.0040.01115.06
7.2.220.0040.01115.21
7.2.210.0100.00714.75
7.2.200.0070.00715.10
7.2.190.0030.01014.94
7.2.180.0090.00915.03
7.2.170.0050.00514.83
7.2.00.0070.00419.24
7.1.330.0040.00715.82
7.1.320.0000.01015.42
7.1.310.0080.00815.80
7.1.300.0110.00315.64
7.1.290.0070.01015.40
7.1.280.0030.01015.58
7.1.270.0040.01115.46
7.1.260.0090.00615.59
7.1.70.0070.01016.69
7.1.60.0000.01319.75
7.1.00.0000.08022.30
7.0.200.0160.00014.71
7.0.90.0070.08019.88
7.0.80.0130.05719.98
7.0.70.0130.05319.89
7.0.60.0100.05719.91
7.0.50.0070.06020.42
7.0.40.0070.05720.23
7.0.30.0030.06320.34
7.0.20.0070.06020.35
7.0.10.0100.05720.32
7.0.00.0200.05720.33
5.6.240.0130.06020.68
5.6.230.0170.05020.64
5.6.220.0070.06020.64
5.6.210.0100.05320.49
5.6.200.0200.07021.07
5.6.190.0100.05721.09
5.6.180.0130.05321.08
5.6.170.0130.05321.07
5.6.160.0100.05721.08
5.6.150.0100.05721.02
5.6.140.0230.07321.10
5.6.130.0100.06021.06
5.6.120.0170.05321.19
5.6.110.0170.05321.06
5.6.100.0200.05720.98
5.6.90.0200.06321.05
5.6.80.0170.04720.46
5.6.70.0030.06020.39
5.6.60.0070.05720.48
5.6.50.0200.05320.58
5.6.40.0130.05020.43
5.6.30.0100.06020.41
5.6.20.0070.05720.45
5.6.10.0230.04020.46
5.6.00.0070.05720.37

preferences:
59.67 ms | 401 KiB | 5 Q