3v4l.org

run code in 300+ PHP versions simultaneously
<?php $username = ''; $first_letter = $username[0] ?? '';

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)
8.4.120.0150.00520.64
8.4.110.0090.00618.83
8.4.100.0140.00617.72
8.4.90.0120.00917.75
8.4.80.0110.01017.54
8.4.70.0180.00818.00
8.4.60.0170.01018.10
8.4.50.0200.00617.66
8.4.40.0130.00617.45
8.4.30.0160.00419.01
8.4.20.0190.00318.53
8.4.10.0230.00618.52
8.3.250.0110.00718.91
8.3.240.0090.00916.39
8.3.230.0160.00416.42
8.3.220.0080.00616.87
8.3.210.0070.00616.37
8.3.200.0100.00417.38
8.3.190.0130.00716.84
8.3.180.0060.00416.53
8.3.170.0140.00516.48
8.3.160.0180.00416.48
8.3.150.0150.00616.62
8.3.140.0080.00916.69
8.3.130.0170.00716.62
8.3.120.0200.00417.18
8.3.110.0180.00518.06
8.3.100.0180.00618.25
8.3.90.0210.00418.16
8.3.80.0190.00618.43
8.3.70.0200.00518.36
8.3.60.0240.00418.76
8.3.50.0140.00519.21
8.3.40.0190.00719.39
8.3.30.0190.00419.39
8.3.20.0160.00520.63
8.3.10.0160.00420.84
8.3.00.0130.00221.32
8.2.290.0170.00116.70
8.2.280.0170.00617.37
8.2.270.0130.00516.53
8.2.260.0180.00417.90
8.2.250.0180.00816.41
8.2.240.0150.00617.43
8.2.230.0160.00518.46
8.2.220.0140.00420.33
8.2.210.0160.00620.86
8.2.200.0130.00818.36
8.2.190.0160.00618.77
8.2.180.0210.00520.73
8.2.170.0190.00519.56
8.2.160.0180.00720.47
8.2.150.0180.00421.12
8.2.140.0170.00620.86
8.2.130.0180.00421.26
8.2.120.0160.00419.89
8.2.110.0130.00820.84
8.2.100.0150.00619.14
8.2.90.0170.00719.26
8.2.80.0180.00419.35
8.2.70.0160.00435.98
8.2.60.0160.00618.63
8.2.50.0160.00518.76
8.2.40.0160.00319.19
8.2.30.0120.00618.53
8.2.20.0130.00618.93
8.2.10.0130.00518.51
8.2.00.0130.00518.76
8.1.330.0140.00416.18
8.1.320.0140.00515.83
8.1.310.0150.00916.32
8.1.300.0170.00417.22
8.1.290.0180.00321.71
8.1.280.0190.00520.52
8.1.270.0170.00420.56
8.1.260.0160.00621.12
8.1.250.0140.00521.62
8.1.240.0170.00520.16
8.1.230.0170.00620.24
8.1.220.0180.00419.04
8.1.210.0130.00519.26
8.1.200.0110.00718.50
8.1.190.0130.00718.44
8.1.180.0130.00718.56
8.1.170.0140.00718.83
8.1.160.0160.00318.81
8.1.150.0160.00318.49
8.1.140.0140.00718.41
8.1.130.0120.00517.94
8.1.120.0120.00517.98
8.1.110.0120.00517.88
8.1.100.0110.00417.88
8.1.90.0090.00417.71
8.1.80.0110.00417.82
8.1.70.0100.00517.78
8.1.60.0100.00717.95
8.1.50.0130.00517.87
8.1.40.0130.00517.93
8.1.30.0120.00517.97
8.1.20.0130.00418.01
8.1.10.0120.00417.86
8.1.00.0120.00417.76
8.0.300.0150.00519.25
8.0.290.0160.00618.36
8.0.280.0140.00618.35
8.0.270.0130.00617.76
8.0.260.0130.00317.40
8.0.250.0110.00417.44
8.0.240.0100.00517.41
8.0.230.0090.00617.35
8.0.220.0120.00317.27
8.0.210.0100.00417.27
8.0.200.0090.00517.31
8.0.190.0100.00517.25
8.0.180.0110.00417.21
8.0.170.0110.00517.37
8.0.160.0100.00617.24
8.0.150.0100.00617.20
8.0.140.0100.00617.22
8.0.130.0120.00417.23
8.0.120.0120.00517.20
8.0.110.0120.00417.21
8.0.100.0120.00517.21
8.0.90.0120.00417.18
8.0.80.0120.00417.22
8.0.70.0100.00617.19
8.0.60.0110.00517.17
8.0.50.0110.00517.24
8.0.30.0100.00717.19
8.0.20.0130.00417.25
8.0.10.0110.00517.33
7.4.330.0080.00416.80
7.4.320.0130.00417.18
7.4.300.0100.00517.02
7.4.290.0130.00417.00
7.4.280.0140.00417.00
7.4.270.0140.00517.04
7.4.260.0140.00417.02
7.4.250.0120.00516.98
7.4.240.0130.00417.02
7.4.230.0120.00317.02
7.4.220.0100.00417.01
7.4.210.0100.00517.02
7.4.200.0100.00417.02
7.4.190.0110.00317.05
7.4.180.0110.00417.04
7.4.160.0120.00417.04
7.4.150.0120.00416.97
7.4.140.0120.00416.97
7.4.130.0130.00416.93
7.4.120.0120.00516.92
7.4.110.0120.00416.96
7.4.100.0120.00517.14
7.4.90.0130.00316.94
7.4.80.0120.00416.92
7.4.70.0130.00416.83
7.4.60.0110.00416.89
7.4.50.0110.00416.95
7.4.40.0110.00416.91
7.4.30.0110.00416.97
7.4.20.0110.00516.99
7.4.10.0110.00516.97
7.4.00.0100.00516.98

preferences:
28.85 ms | 403 KiB | 5 Q