3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [ 'USA' => [ 'Alabama' => [ 'Montgomery', 'Birmingham' ], 'Arizona' => [ 'Phoenix', 'Mesa', 'Gilbert' ] ], 'Germany' => [ 'West Germany' => [ 'Bonn', 'Cologne' ] ] ]; $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($arr)); $keys = array(); foreach ($iterator as $key => $value) { // Build long key name based on parent keys $key = [$key]; for ($i = $iterator->getDepth() - 1; $i >= 0; $i--) { //$key = $iterator->getSubIterator($i)->key() . '_' . $key; array_unshift($key, $iterator->getSubIterator($i)->key()); } $key[] = $value; $keys[] = $key; } var_export($keys);

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)
8.3.40.0120.00318.75
8.3.30.0130.00319.22
8.3.20.0040.00420.34
8.3.10.0000.00821.73
8.3.00.0000.00819.38
8.2.170.0120.00322.96
8.2.160.0100.00322.31
8.2.150.0000.00924.18
8.2.140.0000.00824.66
8.2.130.0050.00226.16
8.2.120.0080.00317.93
8.2.110.0000.00920.52
8.2.100.0090.00317.63
8.2.90.0050.00319.21
8.2.80.0040.00417.97
8.2.70.0080.00417.63
8.2.60.0000.00918.05
8.2.50.0070.00318.07
8.2.40.0040.00419.88
8.2.30.0040.00418.09
8.2.20.0000.00817.81
8.2.10.0040.00418.21
8.2.00.0000.00717.75
8.1.270.0030.00520.78
8.1.260.0060.00326.35
8.1.250.0000.00828.09
8.1.240.0110.00022.64
8.1.230.0120.00020.89
8.1.220.0040.00417.74
8.1.210.0000.00818.77
8.1.200.0030.00617.22
8.1.190.0040.00417.25
8.1.180.0080.00018.10
8.1.170.0030.00620.30
8.1.160.0040.00421.91
8.1.150.0000.00718.96
8.1.140.0000.01017.43
8.1.130.0070.00017.54
8.1.120.0000.00717.48
8.1.110.0000.00817.49
8.1.100.0030.00517.47
8.1.90.0070.00017.39
8.1.80.0040.00417.47
8.1.70.0030.00317.55
8.1.60.0030.00517.54
8.1.50.0000.00817.59
8.1.40.0000.00717.61
8.1.30.0040.00417.66
8.1.20.0040.00417.63
8.1.10.0040.00417.42
8.1.00.0040.00417.38
8.0.300.0040.00418.77
8.0.290.0040.00416.58
8.0.280.0000.00718.47
8.0.270.0030.00317.27
8.0.260.0030.00316.82
8.0.250.0000.00716.96
8.0.240.0000.00817.03
8.0.230.0000.00716.99
8.0.220.0040.00416.83
8.0.210.0040.00416.85
8.0.200.0030.00317.00
8.0.190.0080.00016.98
8.0.180.0040.00416.92
8.0.170.0040.00416.94
8.0.160.0030.00416.89
8.0.150.0050.00316.97
8.0.140.0070.00016.88
8.0.130.0030.00313.31
8.0.120.0090.00016.85
8.0.110.0080.00016.94
8.0.100.0040.00416.81
8.0.90.0000.00716.97
8.0.80.0090.00616.88
8.0.70.0040.00416.91
8.0.60.0000.00717.00
8.0.50.0070.00016.79
8.0.30.0130.01217.23
8.0.20.0070.01317.45
8.0.10.0040.00416.99
8.0.00.0090.00916.76
7.4.330.0050.00015.03
7.4.320.0030.00316.63
7.4.300.0030.00316.52
7.4.290.0000.00716.67
7.4.280.0030.00516.51
7.4.270.0030.00316.56
7.4.260.0040.00416.59
7.4.250.0050.00316.50
7.4.240.0030.00516.59
7.4.230.0070.00016.63
7.4.220.0070.01116.41
7.4.210.0120.00816.59
7.4.200.0070.00016.64
7.4.160.0090.00616.43
7.4.150.0120.00617.40
7.4.140.0090.00917.86
7.4.130.0080.01216.58
7.4.120.0060.01116.48
7.4.110.0070.01416.54
7.4.100.0130.00316.60
7.4.90.0120.01216.50
7.4.80.0070.01016.56
7.4.70.0030.01416.69
7.4.60.0110.00716.50
7.4.50.0000.00516.64
7.4.40.0090.00616.49
7.4.30.0150.00416.51
7.4.00.0090.00615.08
7.3.330.0060.00013.05
7.3.320.0080.00413.19
7.3.310.0040.00416.26
7.3.300.0000.00616.28
7.3.290.0070.00016.25
7.3.280.0100.00816.32
7.3.270.0100.01417.40
7.3.260.0120.00616.42
7.3.250.0110.00916.43
7.3.240.0100.01316.43
7.3.230.0130.01016.47
7.3.210.0080.00816.48
7.3.200.0110.01119.39
7.3.190.0080.00816.38
7.3.180.0100.01016.69
7.3.170.0110.01116.29
7.3.160.0040.01116.35
7.3.120.0120.00714.82
7.3.110.0040.01214.84
7.3.100.0070.01014.72
7.3.90.0090.00414.76
7.3.80.0070.00614.79
7.3.70.0100.00714.81
7.3.60.0050.00914.82
7.3.50.0020.01314.72
7.3.40.0070.01014.70
7.3.30.0040.00814.69
7.3.20.0060.00616.60
7.3.10.0040.00816.64
7.3.00.0070.00616.70
7.2.330.0120.01216.42
7.2.320.0070.01016.79
7.2.310.0200.00316.37
7.2.300.0100.00716.69
7.2.290.0140.00316.55
7.2.250.0070.00915.16
7.2.240.0080.01115.02
7.2.230.0050.01315.22
7.2.220.0030.00815.21
7.2.210.0030.01114.99
7.2.200.0080.01015.08
7.2.190.0100.00515.20
7.2.180.0080.00715.22
7.2.170.0110.00514.96
7.2.00.0000.00919.68
7.1.330.0070.00815.71
7.1.320.0060.00516.04
7.1.310.0050.00815.83
7.1.300.0030.00915.76
7.1.290.0090.00615.97
7.1.280.0060.00815.73
7.1.270.0070.00715.59
7.1.260.0030.00815.84
7.1.100.0060.01018.33
7.1.70.0040.00417.30
7.1.60.0070.01719.50
7.1.50.0040.01916.91
7.1.00.0070.07322.45
7.0.200.0180.00415.00
7.0.140.0100.06022.04
7.0.60.0070.05719.99
7.0.50.0070.07317.87
7.0.40.0070.04320.29
7.0.30.0300.08020.02
7.0.20.0270.08020.30
7.0.10.0270.08320.09
7.0.00.0100.04320.16
5.6.210.0100.06720.75
5.6.200.0070.06018.21
5.6.190.0130.08320.39
5.6.180.0370.07320.59
5.6.170.0430.08020.40
5.6.160.0100.07720.40
5.6.150.0100.05018.12
5.6.140.0070.08018.21
5.6.130.0170.07318.14
5.6.120.0070.08320.98
5.6.110.0170.07021.13
5.6.100.0100.06721.00
5.6.90.0100.05321.09
5.6.80.0070.07720.50
5.6.70.0330.07020.37
5.5.350.0200.06020.33
5.5.340.0070.07717.89
5.5.330.0070.04320.23
5.5.320.0100.05020.47
5.5.310.0230.08320.20
5.5.300.0030.04018.00
5.5.290.0100.07317.97
5.5.280.0070.04320.84
5.5.270.0070.08720.71
5.5.260.0030.08020.73
5.5.250.0100.08320.71
5.5.240.0070.04020.28
5.4.450.0770.04719.41
5.4.440.1100.05319.24
5.4.430.1030.06319.39
5.4.420.0800.05719.37
5.4.410.1000.05019.14
5.4.400.0370.07318.75
5.4.390.0400.05318.72
5.4.380.0430.06018.61
5.4.370.0370.06018.53
5.4.360.0200.06318.74
5.4.350.0170.07018.47
5.4.340.0430.05318.54
5.4.320.0470.07018.55
5.4.310.0370.07318.71
5.4.300.0470.05718.71
5.4.290.0300.05718.50
5.4.280.0270.06718.50
5.4.270.0570.05018.68
5.4.260.0470.05318.66
5.4.250.0430.06318.50
5.4.240.0330.06718.71
5.4.230.0230.05718.68
5.4.220.0230.05718.57
5.4.210.0370.06018.57
5.4.200.0270.05716.66
5.4.190.0330.06018.59
5.4.180.0330.06718.57
5.4.170.0430.06318.64
5.4.160.0470.05018.70
5.4.150.0330.05318.71
5.4.140.0370.05316.29
5.4.130.0400.05716.28
5.4.120.0400.05316.17
5.4.110.0330.06016.16
5.4.100.0430.05316.18
5.4.90.0330.06716.13
5.4.80.0470.05016.26
5.4.70.0370.07316.29
5.4.60.0400.06716.19
5.4.50.0400.05716.06
5.4.40.0430.05016.27
5.4.30.0300.05316.11
5.4.20.0330.06016.23
5.4.10.0300.05316.10
5.4.00.0370.03715.55
5.3.290.0370.05714.61
5.3.280.0270.06314.50
5.3.270.0400.05314.60
5.3.260.0430.06714.60
5.3.250.0300.05014.58
5.3.240.0430.07014.53
5.3.230.0400.07314.57
5.3.220.0200.06714.57
5.3.210.0330.05314.47
5.3.200.0170.06714.48
5.3.190.0330.07314.55
5.3.180.0230.05714.64
5.3.170.0330.06314.47
5.3.160.0270.05714.62
5.3.150.0200.06014.61
5.3.140.0270.06014.45
5.3.130.0370.08714.60
5.3.120.0370.07014.55
5.3.110.0270.05714.45
5.3.100.0370.05014.06
5.3.90.0170.06314.01
5.3.80.0270.05313.93
5.3.70.0200.06714.11
5.3.60.0470.05314.09
5.3.50.0370.05313.84
5.3.40.0300.07314.02
5.3.30.0500.06714.00
5.3.20.0300.07013.62
5.3.10.0300.07313.69
5.3.00.0300.07713.72
5.2.170.0200.07311.14
5.2.160.0370.05711.09
5.2.150.0400.05011.11
5.2.140.0330.05311.14
5.2.130.0270.06311.13
5.2.120.0370.05711.12
5.2.110.0270.06011.11
5.2.100.0270.04311.14
5.2.90.0370.05011.11
5.2.80.0300.06311.15
5.2.70.0400.05711.13
5.2.60.0470.05011.08
5.2.50.0270.07011.15
5.2.40.0170.07011.14
5.2.30.0170.05310.95
5.2.20.0230.05010.91
5.2.10.0270.05010.98
5.2.00.0170.05010.76
5.1.60.0200.03710.01
5.1.50.0270.03010.00
5.1.40.0130.0539.99
5.1.30.0500.04010.34
5.1.20.0130.05710.39
5.1.10.0200.04710.09
5.1.00.0200.03710.13
5.0.50.0130.0308.57
5.0.40.0200.0238.47
5.0.30.0100.0608.28
5.0.20.0170.0378.29
5.0.10.0170.0378.20
5.0.00.0070.0508.22
4.4.90.0170.0275.89
4.4.80.0130.0305.87
4.4.70.0130.0235.89
4.4.60.0070.0305.89
4.4.50.0100.0235.88
4.4.40.0170.0335.93
4.4.30.0200.0275.87
4.4.20.0230.0235.96
4.4.10.0230.0175.96
4.4.00.0200.0375.95
4.3.110.0130.0305.76
4.3.100.0170.0275.80
4.3.90.0130.0275.79
4.3.80.0130.0435.79
4.3.70.0200.0305.76
4.3.60.0330.0175.81
4.3.50.0170.0205.79
4.3.40.0170.0475.78
4.3.30.0100.0234.72
4.3.20.0070.0304.72
4.3.10.0070.0304.72
4.3.00.0130.0207.59

preferences:
50.57 ms | 400 KiB | 5 Q