3v4l.org

run code in 300+ PHP versions simultaneously
<?php $merged = [ 'a' => 'b', 'b' => 'c', 'c' => 'z', 'd' => 'a', 'e' => 'z' ]; $aliasesReduced = false; while(!$aliasesReduced) { $aliasesReduced = true; foreach($merged as $originalId => &$mergedId) { if (array_key_exists($mergedId, $merged)) { $mergedId = $merged[$mergedId]; $aliasesReduced = false; } } } print_r($aliases);

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)
8.3.60.0160.00016.75
8.3.50.0150.00521.98
8.3.40.0030.01418.98
8.3.30.0040.01119.04
8.3.20.0070.00020.33
8.3.10.0040.00421.87
8.3.00.0030.00619.23
8.2.180.0090.00618.27
8.2.170.0120.00322.96
8.2.160.0100.00322.25
8.2.150.0040.00424.18
8.2.140.0050.00324.66
8.2.130.0040.00426.16
8.2.120.0000.00819.36
8.2.110.0090.00019.26
8.2.100.0060.00617.63
8.2.90.0000.00819.11
8.2.80.0000.00917.97
8.2.70.0000.00817.63
8.2.60.0040.00418.16
8.2.50.0040.00418.07
8.2.40.0000.00818.28
8.2.30.0070.00018.16
8.2.20.0040.00417.66
8.2.10.0040.00418.05
8.2.00.0040.00417.92
8.1.280.0150.00425.92
8.1.270.0080.00019.00
8.1.260.0000.00726.35
8.1.250.0080.00028.09
8.1.240.0000.00922.21
8.1.230.0040.00817.77
8.1.220.0000.00817.79
8.1.210.0000.00818.77
8.1.200.0030.00717.35
8.1.190.0080.00017.23
8.1.180.0040.00418.10
8.1.170.0030.00618.96
8.1.160.0050.00221.93
8.1.150.0000.00718.93
8.1.140.0000.00717.50
8.1.130.0030.00317.77
8.1.120.0000.00817.52
8.1.110.0070.00017.46
8.1.100.0000.00717.33
8.1.90.0050.00317.48
8.1.80.0050.00317.50
8.1.70.0000.00817.37
8.1.60.0000.00917.51
8.1.50.0000.00917.44
8.1.40.0000.00717.48
8.1.30.0000.00817.59
8.1.20.0050.00317.48
8.1.10.0040.00417.35
8.1.00.0060.00917.34
8.0.300.0000.00818.77
8.0.290.0000.00716.75
8.0.280.0080.00018.51
8.0.270.0030.00317.14
8.0.260.0030.00317.20
8.0.250.0000.00716.94
8.0.240.0000.00817.05
8.0.230.0000.00716.93
8.0.220.0070.00016.94
8.0.210.0030.00316.96
8.0.200.0000.00716.91
8.0.190.0030.00317.06
8.0.180.0000.00816.98
8.0.170.0040.00416.87
8.0.160.0000.00717.06
8.0.150.0000.00717.00
8.0.140.0060.00316.90
8.0.130.0030.00313.40
8.0.120.0040.00416.83
8.0.110.0050.00316.89
8.0.100.0000.00716.83
8.0.90.0050.00317.03
8.0.80.0150.00616.90
8.0.70.0040.00416.97
8.0.60.0030.00516.84
8.0.50.0000.00716.86
8.0.30.0090.01717.03
8.0.20.0080.01317.40
8.0.10.0040.00417.11
8.0.00.0100.01016.88
7.4.330.0060.00015.08
7.4.320.0030.00316.63
7.4.300.0000.00716.46
7.4.290.0070.00016.47
7.4.280.0000.00916.58
7.4.270.0070.00016.63
7.4.260.0040.00416.50
7.4.250.0000.00716.49
7.4.240.0030.00416.55
7.4.230.0070.00016.37
7.4.220.0090.00916.51
7.4.210.0110.00416.64
7.4.200.0070.00016.39
7.4.160.0060.00916.69
7.4.150.0130.01417.40
7.4.140.0100.01217.86
7.4.130.0080.01316.58
7.4.120.0060.01116.37
7.4.110.0120.00616.50
7.4.100.0130.00616.52
7.4.90.0100.00716.52
7.4.80.0090.00919.39
7.4.70.0110.00616.51
7.4.60.0130.00416.51
7.4.50.0000.00816.57
7.4.40.0070.01116.60
7.4.30.0140.00816.52
7.4.00.0040.01114.90
7.3.330.0050.00013.38
7.3.320.0150.00013.30
7.3.310.0000.00716.48
7.3.300.0050.00216.37
7.3.290.0070.00916.36
7.3.280.0070.00716.34
7.3.270.0110.00717.40
7.3.260.0130.00316.58
7.3.250.0080.00816.51
7.3.240.0090.00916.50
7.3.230.0100.00716.62
7.3.210.0210.00416.38
7.3.200.0100.00619.39
7.3.190.0090.00616.43
7.3.180.0120.00416.41
7.3.170.0030.01316.43
7.3.160.0060.01116.38
7.2.330.0110.00916.38
7.2.320.0110.01216.70
7.2.310.0060.01216.75
7.2.300.0100.00816.56
7.2.290.0110.01116.68
7.2.60.0070.00717.15
7.2.00.0060.00619.45
7.1.200.0180.00615.24
7.1.100.0040.00817.80
7.1.70.0030.00617.30
7.1.60.0130.01019.50
7.1.50.0040.00816.98
7.1.00.0000.08022.45
7.0.200.0160.00516.77
7.0.140.0000.07322.22
7.0.60.0200.06720.08
7.0.50.0100.04017.86
7.0.40.0100.07020.04
7.0.30.0200.04320.02
7.0.20.0330.07020.13
7.0.10.0370.08020.30
7.0.00.0030.04320.12
5.6.280.0000.07321.14
5.6.210.0170.07320.69
5.6.200.0100.08318.18
5.6.190.0130.05020.56
5.6.180.0170.04020.74
5.6.170.0270.07720.49
5.6.160.0070.08720.71
5.6.150.0000.04318.07
5.6.140.0070.08318.21
5.6.130.0130.04018.09
5.6.120.0030.04721.03
5.6.110.0100.06020.98
5.6.100.0130.07320.88
5.6.90.0030.07320.92
5.6.80.0000.04720.38
5.6.70.0230.07320.34
5.5.350.0230.06020.43
5.5.340.0070.03718.02
5.5.330.0030.08720.37
5.5.320.0000.04720.38
5.5.310.0330.07020.28
5.5.300.0030.07017.96
5.5.290.0030.05717.95
5.5.280.0100.08320.76
5.5.270.0030.04020.76
5.5.260.0100.08020.79
5.5.250.0070.07720.79
5.5.240.0030.06020.15
5.4.450.0700.05719.41
5.4.440.0630.06019.47
5.4.430.0070.06319.43
5.4.420.0800.06019.09
5.4.410.0930.06019.28
5.4.400.0300.04718.61
5.4.390.1570.05318.70
5.4.380.1500.06018.46
5.4.370.0430.05018.73
5.4.360.0470.05018.63
5.4.350.0300.05318.73
5.4.340.0400.07018.61
5.4.320.0530.05718.52
5.4.310.0330.06718.73
5.4.300.0500.05018.65
5.4.290.0330.04718.77
5.4.280.0170.06318.48
5.4.270.0270.05718.73
5.4.260.0300.07718.55
5.4.250.0400.07318.68
5.4.240.0400.06718.48
5.4.230.0330.06018.68
5.4.220.0400.05718.68
5.4.210.0230.05018.62
5.4.200.0330.05016.64
5.4.190.0500.05318.70
5.4.180.0230.05718.75
5.4.170.2730.05718.57
5.4.160.0400.06318.65
5.4.150.0370.05018.66
5.4.140.0400.04716.25
5.4.130.0300.05316.11
5.4.120.0330.04316.25
5.4.110.0400.06016.04
5.4.100.0230.05016.21
5.4.90.0100.06316.12
5.4.80.2330.06016.28
5.4.70.0430.05716.08
5.4.60.0470.06716.23
5.4.50.0530.04716.03
5.4.40.0270.05316.05
5.4.30.0300.04716.13
5.4.20.1600.05316.21
5.4.10.0400.04316.04
5.4.00.0400.04715.56
5.3.290.0270.05714.75
5.3.280.0270.07714.51
5.3.270.0270.06014.66
5.3.260.0370.05714.66
5.3.250.0300.05314.55
5.3.240.0330.05714.57
5.3.230.0370.06314.58
5.3.220.0170.06014.62
5.3.210.0300.05714.48
5.3.200.1470.06014.55
5.3.190.0430.05314.50
5.3.180.0470.05014.55
5.3.170.0370.04314.63
5.3.160.0330.07014.51
5.3.150.0200.05314.55
5.3.140.0300.06014.56
5.3.130.0400.07014.48
5.3.120.0230.06314.51
5.3.110.0270.05714.46
5.3.100.0270.06713.95
5.3.90.0230.05714.07
5.3.80.0270.06013.98
5.3.70.0270.06013.97
5.3.60.0400.05014.07
5.3.50.0200.07313.93
5.3.40.0170.05313.90
5.3.30.0270.04313.90
5.3.20.0100.05313.68
5.3.10.0230.05013.60
5.3.00.0330.07013.53
5.2.170.0400.05011.31
5.2.160.0270.05711.29
5.2.150.0200.06311.20
5.2.140.0330.03711.07
5.2.130.0200.04011.08
5.2.120.0270.03711.10
5.2.110.0100.04311.05
5.2.100.0130.03711.14
5.2.90.0300.03711.23
5.2.80.0230.04011.04
5.2.70.0070.05011.14
5.2.60.0330.03310.99
5.2.50.0330.03711.07
5.2.40.0070.05010.95
5.2.30.0170.04010.89
5.2.20.0170.04010.94
5.2.10.0170.03310.89
5.2.00.1400.04010.87
5.1.60.0200.0339.97
5.1.50.0230.03710.11
5.1.40.0170.0379.95
5.1.30.0100.03710.49
5.1.20.0130.03710.37
5.1.10.0230.04310.11
5.1.00.0230.03010.09
5.0.50.0100.0308.68
5.0.40.0200.0308.50
5.0.30.0130.0508.25
5.0.20.0100.0238.23
5.0.10.1470.0238.29
5.0.00.0100.0408.22
4.4.90.0200.0235.90
4.4.80.0070.0305.94
4.4.70.0070.0305.89
4.4.60.0130.0275.86
4.4.50.2100.0275.86
4.4.40.0100.0435.96
4.4.30.0200.0205.86
4.4.20.0070.0335.96
4.4.10.0200.0235.98
4.4.00.0070.0475.93
4.3.110.0000.0305.83
4.3.100.0130.0175.87
4.3.90.0170.0175.79
4.3.80.0130.0275.78
4.3.70.2030.0235.76
4.3.60.0100.0205.76
4.3.50.0200.0205.81
4.3.40.0070.0375.77
4.3.30.0030.0334.64
4.3.20.0070.0304.53
4.3.10.0200.0204.48
4.3.00.0100.0236.90

preferences:
47.42 ms | 401 KiB | 5 Q