3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'aaAAąAŚĆżź'; echo preg_replace_callback( '/(\p{Lu})|(\p{Ll})/u', function($m) { return $m[1] ? mb_strtolower($m[1]) : mb_strtoupper($m[2]); }, $string );

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)
8.3.60.0130.00316.88
8.3.50.0110.00418.57
8.3.40.0040.01118.97
8.3.30.0070.00718.96
8.3.20.0000.00824.18
8.3.10.0000.00724.66
8.3.00.0000.00926.16
8.2.180.0080.00825.92
8.2.170.0110.00419.20
8.2.160.0100.00322.96
8.2.150.0000.00725.66
8.2.140.0030.00524.66
8.2.130.0040.00426.16
8.2.120.0000.00721.19
8.2.110.0070.00421.19
8.2.100.0040.00818.09
8.2.90.0050.00218.47
8.2.80.0000.00818.00
8.2.70.0000.00817.93
8.2.60.0040.00417.75
8.2.50.0000.00818.10
8.2.40.0040.00421.23
8.2.30.0070.00019.35
8.2.20.0040.00418.21
8.2.10.0000.00719.46
8.2.00.0040.00419.28
8.1.280.0060.01225.92
8.1.270.0080.00020.64
8.1.260.0040.00426.35
8.1.250.0090.00028.09
8.1.240.0060.00323.88
8.1.230.0060.00620.91
8.1.220.0060.00317.89
8.1.210.0030.00618.97
8.1.200.0060.00317.60
8.1.190.0050.00517.59
8.1.180.0040.00418.10
8.1.170.0100.00018.78
8.1.160.0000.00719.02
8.1.150.0000.00719.16
8.1.140.0050.00219.09
8.1.130.0000.00717.90
8.1.120.0030.00617.73
8.1.110.0030.00517.59
8.1.100.0040.00417.67
8.1.90.0000.00717.63
8.1.80.0070.00317.62
8.1.70.0000.00717.57
8.1.60.0000.00817.79
8.1.50.0000.00817.69
8.1.40.0000.00817.63
8.1.30.0030.00617.75
8.1.20.0040.00417.79
8.1.10.0000.00717.85
8.1.00.0000.00817.61
8.0.300.0000.00820.15
8.0.290.0050.00317.00
8.0.280.0000.00718.54
8.0.270.0000.00716.97
8.0.260.0000.00817.16
8.0.250.0040.00417.14
8.0.240.0050.00217.20
8.0.230.0050.00317.07
8.0.220.0030.00517.22
8.0.210.0070.00017.12
8.0.200.0030.00317.18
8.0.190.0040.00417.19
8.0.180.0000.00717.20
8.0.170.0030.00617.16
8.0.160.0040.00417.06
8.0.150.0000.00717.18
8.0.140.0040.00417.00
8.0.130.0040.00413.61
8.0.120.0030.00517.11
8.0.110.0000.00717.23
8.0.100.0030.00517.26
8.0.90.0000.00717.24
8.0.80.0030.01117.18
8.0.70.0070.00017.22
8.0.60.0050.00217.18
8.0.50.0000.00817.25
8.0.30.0070.01417.25
8.0.20.0070.00717.23
8.0.10.0060.01017.23
8.0.00.0070.01417.29
7.4.330.0030.00316.79
7.4.320.0050.00216.86
7.4.300.0030.00316.86
7.4.290.0030.00316.80
7.4.280.0030.00616.82
7.4.270.0030.00316.95
7.4.260.0030.00313.66
7.4.250.0040.00416.83
7.4.240.0040.00416.97
7.4.230.0030.00516.95
7.4.220.0060.00116.95
7.4.210.0070.00916.86
7.4.200.0050.00316.68
7.4.160.0030.01016.85
7.4.150.0000.01516.95
7.4.140.0030.01316.82
7.4.130.0070.00716.90
7.4.120.0030.01016.76
7.4.110.0060.00916.70
7.4.100.0070.00716.82
7.4.90.0070.00716.77
7.4.80.0120.00816.77
7.4.70.0140.00016.91
7.4.60.0030.01016.80
7.4.50.0030.01216.75
7.4.40.0040.01116.82
7.4.30.0070.00716.81
7.4.20.0070.00716.76
7.4.10.0050.00816.87
7.4.00.0060.00917.07
7.3.330.0080.00016.54
7.3.320.0000.00613.48
7.3.310.0000.00816.50
7.3.300.0070.00016.50
7.3.290.0090.00916.56
7.3.280.0030.01016.59
7.3.270.0070.00716.55
7.3.260.0070.00716.58
7.3.250.0100.00316.60
7.3.240.0030.01116.59
7.3.230.0060.00716.60
7.3.220.0000.01416.41
7.3.210.0050.00816.57
7.3.200.0070.00716.57
7.3.190.0030.01016.59
7.3.180.0090.00616.48
7.3.170.0090.00616.54
7.3.160.0070.00716.54
7.3.150.0070.00716.47
7.3.140.0110.00416.53
7.3.130.0070.00716.51
7.3.120.0140.00716.55
7.3.110.0110.00316.44
7.3.100.0070.00716.52
7.3.90.0000.01416.77
7.3.80.0100.00316.46
7.3.70.0080.00816.64
7.3.60.0030.01016.69
7.3.50.0110.00416.73
7.3.40.0100.00316.70
7.3.30.0030.01016.61
7.3.20.0000.01416.62
7.3.10.0090.00616.66
7.3.00.0060.00916.64
7.2.340.0090.00513.56

preferences:
62.41 ms | 401 KiB | 5 Q