3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($i = 0; $i < 0x10ffff; $i++) { $chr = mb_chr($i); if (strlen($chr) !== strlen(mb_strtolower($chr)) || strlen($chr) !== strlen(mb_strtoupper($chr))) { var_dump($i); var_dump($chr); var_dump(mb_strtolower($chr)); var_dump(mb_strtoupper($chr)); break; } }

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)
8.4.140.0160.00517.45
8.4.130.0140.00717.87
8.4.120.0120.00920.81
8.4.110.0140.00818.96
8.4.100.0110.01017.70
8.4.90.0100.01019.61
8.4.80.0020.00717.95
8.4.70.0100.01018.06
8.4.60.0050.00418.69
8.4.50.0070.00217.69
8.4.40.0120.00622.28
8.4.30.0130.00620.27
8.4.20.0130.00617.82
8.4.10.0000.00822.00
8.3.270.0100.00916.43
8.3.260.0170.00716.82
8.3.250.0060.00218.71
8.3.240.0130.00716.42
8.3.230.0170.00416.65
8.3.220.0110.00716.96
8.3.210.0130.00516.43
8.3.200.0060.00216.55
8.3.190.0100.00818.77
8.3.180.0080.00216.44
8.3.170.0080.00016.81
8.3.160.0150.00316.57
8.3.150.0120.00617.36
8.3.140.0060.00318.91
8.3.130.0050.00318.38
8.3.120.0030.00618.89
8.3.110.0080.00020.94
8.3.100.0150.00624.06
8.3.90.0090.00026.77
8.3.80.0090.00016.63
8.3.70.0110.00418.31
8.3.60.0120.00316.63
8.3.50.0140.00720.30
8.3.40.0110.00421.98
8.3.30.0120.00618.54
8.3.20.0080.00024.18
8.3.10.0070.00024.66
8.3.00.0050.00326.16
8.2.290.0050.00420.46
8.2.280.0120.00818.62
8.2.270.0090.00916.68
8.2.260.0090.00918.81
8.2.250.0100.01016.39
8.2.240.0000.00916.98
8.2.230.0040.00422.58
8.2.220.0030.00637.54
8.2.210.0070.00726.77
8.2.200.0060.00316.25
8.2.190.0110.01116.63
8.2.180.0090.00625.92
8.2.170.0120.00318.90
8.2.160.0000.01522.96
8.2.150.0070.00025.66
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0030.00526.16
8.2.110.0050.00522.21
8.2.100.0100.00317.84
8.2.90.0090.00017.63
8.2.80.0000.00818.03
8.2.70.0040.00417.25
8.2.60.0030.00517.59
8.2.50.0000.00917.98
8.2.40.0040.00418.03
8.2.30.0000.00818.20
8.2.20.0050.00220.28
8.2.10.0000.00718.21
8.2.00.0000.00719.21
8.1.330.0090.01118.49
8.1.320.0110.00916.02
8.1.310.0000.00816.61
8.1.300.0090.00618.57
8.1.290.0100.00030.84
8.1.280.0120.00325.92
8.1.270.0030.00623.99
8.1.260.0050.00326.35
8.1.250.0050.00328.09
8.1.240.0060.00322.11
8.1.230.0070.00719.01
8.1.220.0030.00517.79
8.1.210.0030.00518.77
8.1.200.0090.00017.35
8.1.190.0060.00317.09
8.1.180.0040.00718.10
8.1.170.0060.00317.62
8.1.160.0000.00719.13
8.1.150.0030.00718.75
8.1.140.0040.00417.60
8.1.130.0000.00719.02
8.1.120.0070.00017.44
8.1.110.0030.00617.57
8.1.100.0000.00817.56
8.1.90.0040.00317.43
8.1.80.0040.00417.52
8.1.70.0160.00017.49
8.1.60.0160.00317.63
8.1.50.0140.00517.49
8.1.40.0190.00017.58
8.1.30.0120.00417.65
8.1.20.0200.00017.63
8.1.10.0140.00617.47
8.1.00.0170.00217.43
8.0.300.0000.00819.54
8.0.290.0000.00716.75
8.0.280.0030.00318.61
8.0.270.0070.00016.95
8.0.260.0000.00718.45
8.0.250.0000.00717.09
8.0.240.0030.00317.10
8.0.230.0040.00417.04
8.0.220.0000.00617.02
8.0.210.0080.00817.02
8.0.200.0120.00416.92
8.0.190.0030.01017.00
8.0.180.0080.00516.98
8.0.170.0050.00816.95
8.0.160.0100.00516.90
8.0.150.0000.01616.86
8.0.140.0130.00416.90
8.0.130.0000.01616.86
8.0.120.0050.01016.89
8.0.110.0070.00716.97
8.0.100.0130.00316.77
8.0.90.0080.00817.02
8.0.80.0080.00817.01
8.0.70.0090.00716.91
8.0.60.0050.01016.94
8.0.50.0120.00316.90
8.0.30.0160.00016.91
8.0.20.0120.00316.97
8.0.10.0080.00816.85
7.4.330.0050.00015.55
7.4.320.0050.00216.69
7.4.300.0080.00816.55
7.4.290.0110.00516.69
7.4.280.0070.01116.60
7.4.270.0190.00416.67
7.4.260.0230.00316.68
7.4.250.0130.00316.65
7.4.240.0070.00716.53
7.4.230.0080.00816.57
7.4.220.0090.00416.59
7.4.210.0090.00516.57
7.4.200.0080.00516.71
7.4.190.0120.00316.60
7.4.180.0080.00416.73
7.4.160.0080.00416.65
7.4.150.0030.00916.50
7.4.140.0090.00516.50
7.4.130.0080.00516.46
7.4.120.0060.00716.50
7.4.110.0090.00416.51
7.4.100.0100.00316.57
7.4.90.0080.00316.62
7.4.80.0000.01316.50
7.4.70.0110.00316.36
7.4.60.0090.00516.50
7.4.50.0110.00216.52
7.4.40.0050.00916.46
7.4.30.0050.00916.56
7.4.20.0040.00916.49
7.4.10.0090.00616.50
7.4.00.0130.00016.50

preferences:
88.3 ms | 403 KiB | 5 Q