3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(strlen('user_')); var_dump(mb_strlen('user_')); var_dump(substr('user_', 0, 2)); var_dump(mb_substr('user_', 0, 2)); var_dump(substr('user_', 2)); var_dump(mb_substr('user_', 2)); var_dump(strlen('Лорем')); var_dump(mb_strlen('Лорем')); var_dump(substr('Лорем', 0, 2)); var_dump(mb_substr('Лорем', 0, 2)); var_dump(substr('Лорем', 2)); var_dump(mb_substr('Лорем', 2)); echo 'This breaks your database because of the invalid char:' . "\n"; var_dump(substr('Лорем', 3)); var_dump(mb_substr('Лорем', 3));

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)
8.5.10.0110.01016.55
8.5.00.0120.00919.48
8.4.160.0090.01123.81
8.4.150.0020.00114.05
8.4.140.0170.01017.75
8.4.130.0130.00618.83
8.4.120.0060.00523.86
8.4.110.0110.00921.96
8.4.100.0070.00518.65
8.4.90.0100.00520.66
8.4.80.0120.00818.53
8.4.70.0090.00418.97
8.4.60.0080.00918.62
8.4.50.0110.00718.47
8.4.40.0170.00317.37
8.4.30.0130.00618.44
8.4.20.0140.00419.63
8.4.10.0030.00620.89
8.3.290.0110.00920.95
8.3.280.0080.01118.29
8.3.270.0130.00716.62
8.3.260.0030.00716.50
8.3.250.0090.01018.94
8.3.240.0140.00616.96
8.3.230.0130.00516.38
8.3.220.0080.01018.75
8.3.210.0060.00316.48
8.3.200.0060.00316.41
8.3.190.0070.01117.24
8.3.180.0130.00518.73
8.3.170.0130.00316.64
8.3.160.0190.00317.07
8.3.150.0070.01116.34
8.3.140.0090.00920.44
8.3.130.0040.00418.49
8.3.120.0030.00518.67
8.3.110.0080.00020.94
8.3.100.0090.00024.06
8.3.90.0080.00026.77
8.3.80.0030.00619.36
8.3.70.0090.00618.08
8.3.60.0110.01116.50
8.3.50.0120.00725.27
8.3.40.0130.00418.47
8.3.30.0120.00618.54
8.3.20.0060.00324.18
8.3.10.0040.00424.66
8.3.00.0110.00726.16
8.2.300.0110.00822.16
8.2.290.0080.00920.38
8.2.280.0070.00318.46
8.2.270.0070.01016.46
8.2.260.0140.00416.32
8.2.250.0040.00416.88
8.2.240.0050.00317.15
8.2.230.0040.00422.58
8.2.220.0090.00037.54
8.2.210.0040.00426.77
8.2.200.0040.00418.88
8.2.190.0000.01418.29
8.2.180.0040.01125.92
8.2.170.0120.00318.79
8.2.160.0140.00322.96
8.2.150.0000.00825.66
8.2.140.0070.00024.66
8.2.130.0040.00426.16
8.2.120.0000.00826.35
8.2.110.0100.00020.47
8.2.100.0120.00017.70
8.2.90.0000.00917.59
8.2.80.0030.00618.66
8.2.70.0060.00317.13
8.2.60.0000.00817.63
8.2.50.0030.00518.05
8.2.40.0000.00718.16
8.2.30.0050.00317.94
8.2.20.0040.00417.93
8.2.10.0000.00719.22
8.2.00.0040.00419.12
8.1.340.0050.00517.48
8.1.330.0120.00721.87
8.1.320.0130.00716.04
8.1.310.0160.00016.16
8.1.300.0060.01217.88
8.1.290.0030.00630.84
8.1.280.0000.01925.92
8.1.270.0040.00423.99
8.1.260.0040.00428.09
8.1.250.0040.00428.09
8.1.240.0160.00619.14
8.1.230.0080.00421.03
8.1.220.0000.00818.52
8.1.210.0030.00618.77
8.1.200.0000.00817.13
8.1.190.0000.00817.10
8.1.180.0030.00618.10
8.1.170.0020.00518.61
8.1.160.0050.00218.68
8.1.150.0070.00018.78
8.1.140.0000.00818.68
8.1.130.0070.00020.03
8.1.120.0040.00417.37
8.1.110.0000.00917.34
8.1.100.0030.00517.36
8.1.90.0000.00717.30
8.1.80.0030.00917.30
8.1.70.0070.00417.22
8.1.60.0040.00417.62
8.1.50.0080.00017.41
8.1.40.0000.00917.31
8.1.30.0000.00817.48
8.1.20.0040.00417.50
8.1.10.0040.00417.52
8.1.00.0050.00317.47
8.0.300.0000.00718.77
8.0.290.0000.00816.58
8.0.280.0070.00020.25
8.0.270.0000.00718.02
8.0.260.0030.00320.11
8.0.250.0070.00016.85
8.0.240.0030.00316.91
8.0.230.0030.00316.79
8.0.220.0030.00316.82
8.0.210.0000.00716.79
8.0.200.0000.00716.79
8.0.190.0040.00416.91
8.0.180.0040.00416.85
8.0.170.0060.00316.90
8.0.160.0030.00516.83
8.0.150.0050.00316.80
8.0.140.0000.00716.78
8.0.130.0060.00013.28
8.0.120.0040.00416.80
8.0.110.0050.00216.80
8.0.100.0000.00816.69
8.0.90.0000.00816.88
8.0.80.0090.01016.86
8.0.70.0040.00416.80
8.0.60.0000.00716.83
8.0.50.0000.00716.80
8.0.30.0120.01217.03
8.0.20.0190.00317.13
8.0.10.0000.00716.85
8.0.00.0090.01016.68
7.4.330.0020.00215.55
7.4.320.0000.00616.42
7.4.300.0060.00016.44
7.4.290.0050.00316.46
7.4.280.0000.00716.43
7.4.270.0030.00616.54
7.4.260.0030.00313.16
7.4.250.0040.00416.43
7.4.240.0000.00716.41
7.4.230.0030.00316.28
7.4.220.0040.00416.51
7.4.210.0070.00816.47
7.4.200.0050.00216.18
7.4.130.0100.00916.52
7.4.120.0160.00316.21
7.4.110.0110.00916.30
7.4.100.0090.01016.28
7.4.90.0100.00716.35
7.4.80.0230.00716.38
7.4.70.0250.00616.30
7.4.60.0250.00416.18
7.4.50.0290.00616.54
7.4.40.0210.01116.39
7.4.30.0300.00616.41
7.4.20.0230.00716.45
7.4.10.0210.00916.46
7.4.00.0070.01315.84
7.3.330.0000.00716.14
7.3.320.0000.00512.91
7.3.310.0030.00416.14
7.3.300.0040.00416.15
7.3.290.0060.00916.18
7.3.260.0110.00716.06
7.3.230.0150.00316.29
7.3.210.0070.01016.24
7.3.200.0250.00716.19
7.3.190.0300.00516.44
7.3.180.0250.00816.16
7.3.170.0180.01316.16
7.3.160.0340.00016.52
7.3.150.0260.00916.41
7.3.140.0250.00716.20
7.3.130.0320.00016.13
7.3.120.0190.01016.36
7.3.110.0270.00716.43
7.3.100.0120.01816.25
7.3.90.0130.01716.11
7.3.80.0270.00616.10
7.3.70.0300.00816.28
7.3.60.0200.00916.34
7.3.50.0280.00716.38
7.3.40.0240.01016.45
7.3.30.0240.01216.23
7.3.20.0220.01016.23
7.3.10.0170.02016.17
7.3.00.0290.00016.38
7.2.330.0150.00916.36
7.2.320.0260.00716.33
7.2.310.0250.01216.48
7.2.300.0210.01216.42
7.2.290.0290.00616.58
7.2.280.0210.01116.41
7.2.270.0340.00016.49
7.2.260.0250.00716.53
7.2.250.0220.00716.55
7.2.240.0220.01216.35
7.2.230.0270.01116.66
7.2.220.0210.01616.41
7.2.210.0260.01216.49
7.2.200.0270.01216.37
7.2.190.0260.01016.54
7.2.180.0240.00716.27
7.2.170.0220.01116.63
7.2.160.0230.00716.56
7.2.150.0470.00616.64
7.2.140.0220.01416.63
7.2.130.0260.00516.63
7.2.120.0250.00816.53
7.2.110.0290.00816.50
7.2.100.0240.01416.39
7.2.90.0230.01716.38
7.2.80.0280.00916.29
7.2.70.0190.02116.41
7.2.60.0300.00716.43
7.2.50.0230.01816.53
7.2.40.0290.00916.46
7.2.30.0210.01816.46
7.2.20.0240.00616.55
7.2.10.0220.01616.61
7.2.00.0260.00916.32

preferences:
193.47 ms | 403 KiB | 5 Q