3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = 'abcdefghijklm'; for($i=strlen($s)-1, $j=0; $j<$i; $i--, $j++) { list($s[$j], $s[$i]) = array($s[$i], $s[$j]); } echo $s;

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)
8.3.60.0070.00716.74
8.3.50.0130.00521.99
8.3.40.0110.00418.79
8.3.30.0000.01519.27
8.3.20.0050.00220.21
8.3.10.0000.00821.77
8.3.00.0050.00319.38
8.2.180.0120.00618.42
8.2.170.0150.00022.96
8.2.160.0170.00020.53
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0080.00026.16
8.2.120.0080.00019.67
8.2.110.0040.00419.18
8.2.100.0120.00017.63
8.2.90.0040.00419.16
8.2.80.0050.00317.97
8.2.70.0090.00317.38
8.2.60.0000.00817.93
8.2.50.0040.00418.07
8.2.40.0000.00718.16
8.2.30.0000.00718.16
8.2.20.0040.00417.75
8.2.10.0050.00318.12
8.2.00.0000.00717.67
8.1.280.0090.00925.92
8.1.270.0000.00920.73
8.1.260.0070.00026.35
8.1.250.0000.00728.09
8.1.240.0040.00423.97
8.1.230.0090.00317.42
8.1.220.0000.00817.74
8.1.210.0050.00318.77
8.1.200.0100.00017.35
8.1.190.0000.00817.22
8.1.180.0000.00818.10
8.1.170.0080.00020.30
8.1.160.0040.00422.04
8.1.150.0000.00718.89
8.1.140.0070.00017.46
8.1.130.0000.00717.82
8.1.120.0030.00317.45
8.1.110.0000.00717.45
8.1.100.0000.00717.44
8.1.90.0030.00317.47
8.1.80.0000.00817.37
8.1.70.0040.00417.45
8.1.60.0080.00017.48
8.1.50.0000.00717.52
8.1.40.0000.00817.47
8.1.30.0030.00517.55
8.1.20.0030.00517.54
8.1.10.0040.00417.52
8.1.00.0030.00617.40
8.0.300.0000.00818.77
8.0.290.0000.00716.75
8.0.280.0070.00018.32
8.0.270.0080.00017.16
8.0.260.0030.00317.25
8.0.250.0030.00317.02
8.0.240.0040.00416.99
8.0.230.0070.00016.86
8.0.220.0080.00016.85
8.0.210.0030.00316.88
8.0.200.0030.00616.92
8.0.190.0040.00416.92
8.0.180.0040.00416.92
8.0.170.0050.00316.79
8.0.160.0080.00016.78
8.0.150.0030.00316.73
8.0.140.0040.00416.84
8.0.130.0070.00013.36
8.0.120.0030.00516.86
8.0.110.0070.00016.86
8.0.100.0040.00416.77
8.0.90.0060.00316.72
8.0.80.0130.00316.88
8.0.70.0050.00316.79
8.0.60.0000.00716.80
8.0.50.0000.00716.91
8.0.30.0100.01317.09
8.0.20.0120.01017.40
8.0.10.0050.00317.07
8.0.00.0090.00816.61
7.4.330.0050.00015.13
7.4.320.0000.00716.48
7.4.300.0030.00316.63
7.4.290.0070.00016.56
7.4.280.0000.00816.38
7.4.270.0030.00316.58
7.4.260.0060.00016.39
7.4.250.0080.00016.42
7.4.240.0020.00616.50
7.4.230.0040.00416.50
7.4.220.0130.01316.43
7.4.210.0130.00316.71
7.4.200.0050.00316.63
7.4.160.0110.00716.50
7.4.150.0120.00617.40
7.4.140.0050.01217.86
7.4.130.0080.00816.58
7.4.120.0060.01216.46
7.4.110.0120.00616.60
7.4.100.0150.00316.41
7.4.90.0110.00716.52
7.4.80.0090.00819.39
7.4.70.0060.01216.46
7.4.60.0120.00316.53
7.4.50.0040.00416.57
7.4.40.0070.01016.54
7.4.30.0110.00516.53
7.4.00.0060.00614.89
7.3.330.0030.00313.17
7.3.320.0140.00013.09
7.3.310.0070.00016.47
7.3.300.0000.00616.32
7.3.290.0130.00316.34
7.3.280.0100.00916.38
7.3.270.0120.00617.40
7.3.260.0100.00716.38
7.3.250.0080.00916.34
7.3.240.0100.00716.40
7.3.230.0080.01316.55
7.3.210.0140.01016.27
7.3.200.0060.01219.39
7.3.190.0000.01516.33
7.3.180.0100.00716.21
7.3.170.0070.01016.54
7.3.160.0130.00316.32
7.3.10.0110.00016.25
7.3.00.0040.00816.13
7.2.330.0130.00316.59
7.2.320.0140.00716.73
7.2.310.0100.00616.80
7.2.300.0100.00716.87
7.2.290.0130.01016.65
7.2.130.0130.00316.58
7.2.120.0130.00316.96
7.2.110.0130.00016.64
7.2.100.0130.00316.71
7.2.90.0040.00917.04
7.2.80.0100.00616.75
7.2.70.0100.00716.92
7.2.60.0070.00716.92
7.2.50.0110.00717.06
7.2.40.0070.01316.84
7.2.30.0130.00716.98
7.2.20.0130.00716.73
7.2.10.0120.00616.87
7.2.00.0080.01018.17
7.1.250.0100.00715.52
7.1.100.0070.00718.19
7.1.70.0070.00016.93
7.1.60.0140.01119.50
7.1.50.0000.02116.92
7.1.00.0000.08022.40
7.0.200.0050.00316.93
7.0.140.0000.07721.99
7.0.60.0070.08319.96
7.0.50.0030.07017.86
7.0.40.0070.04320.04
7.0.30.0270.07720.18
7.0.20.0270.05020.30
7.0.10.0270.03720.30
7.0.00.0030.05319.99
5.6.280.0030.07021.04
5.6.210.0030.04020.50
5.6.200.0170.07718.19
5.6.190.0070.04720.36
5.6.180.0330.07320.36
5.6.170.0200.04320.50
5.6.160.0130.06720.48
5.6.150.0030.04018.16
5.6.140.0000.04318.08
5.6.130.0100.07718.18
5.6.120.0100.08021.14
5.6.110.0030.08721.11
5.6.100.0070.03720.98
5.6.90.0070.08721.02
5.6.80.0030.07720.50
5.6.70.0270.06720.40
5.5.350.0200.07320.44
5.5.340.0230.03717.97
5.5.330.0030.06720.42
5.5.320.0070.08320.36
5.5.310.0170.04020.23
5.5.300.0030.07317.91
5.5.290.0100.06317.98
5.5.280.0100.06020.96
5.5.270.0030.04020.88
5.5.260.0100.03720.75
5.5.250.0130.07720.68
5.5.240.0070.03720.35
5.4.450.0530.06019.63
5.4.440.1030.05319.32
5.4.430.0100.06019.32
5.4.420.0770.06319.23
5.4.410.1100.08319.42
5.4.400.0330.05718.77
5.4.390.0270.05318.69
5.4.380.0270.05318.61
5.4.370.0430.04018.50
5.4.360.0400.04718.53
5.4.350.0330.05718.72
5.4.340.0330.05018.61
5.4.320.0130.07318.58
5.4.310.0270.05318.72
5.4.300.0300.04718.68
5.4.290.0400.04318.49
5.4.280.0400.05718.50
5.4.270.0370.05318.77
5.4.260.0270.05018.76
5.4.250.0230.05718.49
5.4.240.0200.06018.49
5.4.230.0300.05018.72
5.4.220.0270.06018.55
5.4.210.0270.06018.70
5.4.200.0200.05316.50
5.4.190.0300.05018.76
5.4.180.0270.05018.57
5.4.170.0400.04718.61
5.4.160.0200.06318.66
5.4.150.0400.04318.59
5.4.140.0300.04716.16
5.4.130.0300.04716.21
5.4.120.0270.06316.09
5.4.110.0370.04316.14
5.4.100.0400.04716.29
5.4.90.0270.05316.12
5.4.80.0300.04716.13
5.4.70.0370.07316.33
5.4.60.0370.06716.14
5.4.50.0300.07016.13
5.4.40.0200.05716.10
5.4.30.0300.04716.19
5.4.20.0270.05016.04
5.4.10.0230.05016.23
5.4.00.0230.05015.71
5.3.290.0330.05314.65
5.3.280.0270.05014.68
5.3.270.0200.05714.50
5.3.260.0270.05314.57
5.3.250.0400.05014.70
5.3.240.0300.04714.59
5.3.230.0230.06014.60
5.3.220.0300.05314.66
5.3.210.0270.05314.55
5.3.200.0300.06014.56
5.3.190.0430.04014.56
5.3.180.0270.05314.61
5.3.170.0230.05314.55
5.3.160.0330.04314.45
5.3.150.0230.05314.65
5.3.140.0270.05014.50
5.3.130.0370.04714.54
5.3.120.0330.05714.54
5.3.110.0300.05014.54
5.3.100.0200.05714.00
5.3.90.0300.05714.09
5.3.80.0230.05713.93
5.3.70.0370.04014.00
5.3.60.0230.05714.12
5.3.50.0270.04713.98
5.3.40.0270.04714.04
5.3.30.0400.04714.00
5.3.20.0230.05313.79
5.3.10.0300.04313.74
5.3.00.0370.04313.53
5.2.170.0300.04311.13
5.2.160.0200.06011.28
5.2.150.0230.04311.15
5.2.140.0270.03311.18
5.2.130.0200.04011.08
5.2.120.0200.04011.14
5.2.110.0170.04311.10
5.2.100.0130.04311.05
5.2.90.0170.04311.11
5.2.80.0130.05011.17
5.2.70.0270.03711.05
5.2.60.0170.04711.11
5.2.50.0200.04310.93
5.2.40.0170.04011.13
5.2.30.0170.04310.94
5.2.20.0130.04311.09
5.2.10.0200.03710.97
5.2.00.0200.04310.71
5.1.60.0170.03310.04
5.1.50.0170.03310.02
5.1.40.0170.0339.93
5.1.30.0170.03710.31
5.1.20.0170.03710.32
5.1.10.0230.03010.10
5.1.00.0130.04010.19
5.0.50.0100.0278.66
5.0.40.0100.0278.43
5.0.30.0170.0408.25
5.0.20.0100.0308.37
5.0.10.0130.0308.18
5.0.00.0070.0438.16
4.4.90.0100.0205.90
4.4.80.0100.0205.90
4.4.70.0070.0235.88
4.4.60.0100.0235.89
4.4.50.0070.0235.89
4.4.40.0070.0375.91
4.4.30.0130.0175.88
4.4.20.0070.0235.98
4.4.10.0130.0176.00
4.4.00.0170.0335.84
4.3.110.0030.0275.83
4.3.100.0130.0205.79
4.3.90.0130.0275.89
4.3.80.0100.0435.80
4.3.70.0070.0235.77
4.3.60.0170.0235.79
4.3.50.0000.0305.78
4.3.40.0100.0305.79
4.3.30.0030.0234.84
4.3.20.0000.0274.84
4.3.10.0030.0234.84
4.3.00.0100.0237.12

preferences:
43.64 ms | 401 KiB | 5 Q