3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ 1 => [ 1 => [ 'anna', 'alice' ], 2 => [ 'bob', 'bartold' ] ], 2 => [ 1 => [ 'carol' ], 2 => [ 'david' ] ] ]; $result = []; $prevKey = 0; array_walk_recursive($array, function ($value, $key) use (&$result, &$prevKey) { echo "{$key} ----> "; if (!is_array($value)) { echo "{$prevKey} <br /> -- {$value} <br />"; } else { $prevKey = $key; } }); var_dump($result);

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)
8.3.60.0070.00716.63
8.3.50.0150.00521.95
8.3.40.0040.01118.50
8.3.30.0070.00718.92
8.3.20.0040.00420.09
8.3.10.0080.00021.64
8.3.00.0040.00420.84
8.2.180.0000.01516.59
8.2.170.0120.00322.96
8.2.160.0090.00622.12
8.2.150.0050.00324.18
8.2.140.0040.00424.66
8.2.130.0040.00426.16
8.2.120.0050.00319.63
8.2.110.0100.00020.52
8.2.100.0040.00817.91
8.2.90.0040.00419.14
8.2.80.0060.00317.97
8.2.70.0000.00817.50
8.2.60.0040.00417.80
8.2.50.0080.00018.07
8.2.40.0040.00419.93
8.2.30.0040.00418.06
8.2.20.0050.00317.61
8.2.10.0000.00817.97
8.2.00.0040.00417.79
8.1.280.0070.01325.92
8.1.270.0050.00318.96
8.1.260.0050.00326.35
8.1.250.0070.00028.09
8.1.240.0030.00621.89
8.1.230.0080.00418.97
8.1.220.0080.00017.79
8.1.210.0040.00418.77
8.1.200.0000.00917.35
8.1.190.0000.00817.22
8.1.180.0040.00418.10
8.1.170.0050.00318.59
8.1.160.0030.00322.01
8.1.150.0040.00418.84
8.1.140.0050.00317.36
8.1.130.0060.00317.71
8.1.120.0040.00417.44
8.1.110.0000.01017.45
8.1.100.0000.00817.49
8.1.90.0030.00617.36
8.1.80.0000.00717.34
8.1.70.0030.00517.34
8.1.60.0030.00617.61
8.1.50.0030.00617.56
8.1.40.0000.00817.51
8.1.30.0040.00417.48
8.1.20.0040.00417.62
8.1.10.0000.00717.45
8.1.00.0040.00417.44
8.0.300.0050.00218.77
8.0.290.0070.00016.75
8.0.280.0000.00718.37
8.0.270.0070.00017.23
8.0.260.0030.00317.24
8.0.250.0000.00716.91
8.0.240.0040.00416.91
8.0.230.0050.00316.95
8.0.220.0000.00716.75
8.0.210.0070.00016.88
8.0.200.0000.00716.80
8.0.190.0040.00416.96
8.0.180.0040.00416.80
8.0.170.0040.00416.83
8.0.160.0000.00716.82
8.0.150.0000.00716.78
8.0.140.0000.00716.80
8.0.130.0000.00813.34
8.0.120.0040.00416.91
8.0.110.0040.00416.83
8.0.100.0040.00416.79
8.0.90.0000.00816.87
8.0.80.0120.00916.82
8.0.70.0040.00416.91
8.0.60.0060.00316.88
8.0.50.0030.00516.76
8.0.30.0130.01517.16
8.0.20.0090.01117.40
8.0.10.0000.00817.07
8.0.00.0110.00916.79
7.4.330.0000.00515.03
7.4.320.0000.00716.49
7.4.300.0000.00616.63
7.4.290.0000.00716.59
7.4.280.0070.00416.43
7.4.270.0030.00316.57
7.4.260.0000.00916.55
7.4.250.0030.00616.57
7.4.240.0040.00416.46
7.4.230.0000.00716.40
7.4.220.0110.01116.60
7.4.210.0030.01216.64
7.4.200.0050.00316.41
7.4.160.0070.01016.36
7.4.150.0240.00717.40
7.4.140.0130.00717.86
7.4.130.0050.01516.51
7.4.120.0110.00516.47
7.4.110.0130.00616.54
7.4.100.0050.01316.46
7.4.90.0070.01016.48
7.4.80.0080.00816.48
7.4.70.0140.00316.43
7.4.60.0090.01516.66
7.4.50.0060.00316.60
7.4.40.0090.00816.40
7.4.30.0000.01916.36
7.4.00.0030.01514.65
7.3.330.0050.00013.23
7.3.320.0110.00413.30
7.3.310.0000.00716.23
7.3.300.0030.00316.31
7.3.290.0070.00016.32
7.3.280.0070.01216.35
7.3.270.0120.00717.40
7.3.260.0100.00716.41
7.3.250.0110.00716.58
7.3.240.0140.00516.55
7.3.230.0090.01216.68
7.3.210.0080.00916.39
7.3.200.0090.01219.39
7.3.190.0040.01216.64
7.3.180.0100.01016.56
7.3.170.0060.00916.32
7.3.160.0040.01416.32
7.3.10.0070.01016.37
7.3.00.0130.01316.72
7.2.330.0120.00616.74
7.2.320.0120.00616.61
7.2.310.0110.00716.55
7.2.300.0060.01016.54
7.2.290.0100.01316.79
7.2.130.0120.00616.48
7.2.120.0130.00316.52
7.2.110.0070.00716.68
7.2.100.0090.00916.81
7.2.90.0160.00416.39
7.2.80.0120.00916.51
7.2.70.0100.01016.50
7.2.60.0130.00316.39
7.2.50.0100.01016.57
7.2.40.0110.01116.21
7.2.30.0180.00316.62
7.2.20.0170.00816.69
7.2.10.0130.01716.84
7.2.00.0070.00818.26
7.1.250.0070.01015.48
7.1.100.0070.01118.02
7.1.70.0080.00416.93
7.1.60.0030.02019.46
7.1.50.0150.00716.92
7.1.00.0030.07722.42
7.0.200.0000.00816.81
7.0.140.0000.03721.99
7.0.60.0100.06019.95
7.0.50.0100.05017.83
7.0.40.0100.06020.18
7.0.30.0270.08320.08
7.0.20.0200.04320.19
7.0.10.0100.06720.29
7.0.00.0100.07320.12
5.6.210.0030.05320.56
5.6.200.0030.04718.25
5.6.190.0070.09020.50
5.6.180.3670.03320.42
5.6.170.0170.04720.64
5.6.160.0070.06720.50
5.6.150.0070.04718.19
5.6.140.0030.05018.15
5.6.130.0030.04018.28
5.6.120.0100.07021.04
5.6.110.0000.09321.01
5.6.100.0170.07321.11
5.6.90.0070.08020.98
5.6.80.0030.05020.38
5.6.70.4430.04020.44
5.5.350.0170.03720.41
5.5.340.0370.02717.95
5.5.330.0030.05320.21
5.5.320.0270.08020.34
5.5.310.0130.04320.35
5.5.300.0170.07317.92
5.5.290.0070.03717.93
5.5.280.0230.03720.77
5.5.270.0000.04320.79
5.5.260.0100.08020.64
5.5.250.0130.07020.69
5.5.240.0300.06720.16
5.4.450.0670.05719.44
5.4.440.1170.06019.63
5.4.430.0230.05719.60
5.4.420.0930.06319.54
5.4.410.1130.04719.34
5.4.400.0400.06318.84
5.4.390.0100.05718.51
5.4.380.0170.05718.54
5.4.370.0130.05718.50
5.4.360.0230.04318.79
5.4.350.0130.06018.59
5.4.340.0130.05718.51
5.4.320.0230.05018.63
5.4.310.0270.06018.59
5.4.300.0270.05318.63
5.4.290.0200.05318.70
5.4.280.0330.06018.75
5.4.270.0170.05018.46
5.4.260.0170.06318.71
5.4.250.0200.07018.80
5.4.240.0230.06718.74
5.4.230.0200.06018.62
5.4.220.0100.06018.79
5.4.210.0100.05718.82
5.4.200.0070.06316.61
5.4.190.0370.05318.53
5.4.180.0170.05018.74
5.4.170.0170.06018.54
5.4.160.0070.06318.72
5.4.150.0200.05318.67
5.4.140.0130.06016.43
5.4.130.0170.05316.23
5.4.120.0100.06316.23
5.4.110.0070.06716.33
5.4.100.0200.07316.44
5.4.90.0100.07716.20
5.4.80.0170.04716.33
5.4.70.0100.05716.30
5.4.60.0270.04316.21
5.4.50.0100.06316.29
5.4.40.0170.05016.40
5.4.30.0170.05016.29
5.4.20.0230.04316.29
5.4.10.0130.05316.30
5.4.00.0300.06315.71
5.3.290.0100.08714.66
5.3.280.0170.05314.50
5.3.270.0270.04714.55
5.3.260.0200.07014.64
5.3.250.0170.07314.66
5.3.240.0300.05314.66
5.3.230.0170.06314.69
5.3.220.0170.05714.57
5.3.210.0070.06314.50
5.3.200.0130.05314.62
5.3.190.0000.07014.53
5.3.180.0200.05014.57
5.3.170.0200.06314.47
5.3.160.0130.05714.63
5.3.150.0200.06714.46
5.3.140.0200.05014.50
5.3.130.0130.05714.54
5.3.120.0170.05714.64
5.3.110.0100.05714.48
5.3.100.0300.05014.04
5.3.90.0130.05314.02
5.3.80.0100.05314.05
5.3.70.0170.05313.99
5.3.60.0130.06714.00
5.3.50.0200.04313.89
5.3.40.0100.05313.94
5.3.30.0170.06713.89
5.3.20.0130.04713.79
5.3.10.0200.04713.55
5.3.00.0170.05313.60
5.2.170.0070.05311.05
5.2.160.0130.04311.17
5.2.150.0100.04311.11
5.2.140.0200.03311.20
5.2.130.0170.04011.09
5.2.120.0100.04011.25
5.2.110.0070.04311.25
5.2.100.0100.04011.11
5.2.90.0100.04711.07
5.2.80.0130.04011.03
5.2.70.0170.03711.01
5.2.60.0200.03711.09
5.2.50.0030.05311.05
5.2.40.0100.04311.05
5.2.30.0170.03710.88
5.2.20.0070.04710.92
5.2.10.0100.05710.90
5.2.00.0070.04710.85
5.1.60.0070.04010.01
5.1.50.0130.0479.95
5.1.40.0100.0439.96
5.1.30.0070.04010.38
5.1.20.0070.04010.32
5.1.10.0070.04310.09
5.1.00.0100.03710.14
5.0.50.0100.0308.56
5.0.40.0070.0278.39
5.0.30.0170.0378.32
5.0.20.0030.0308.23
5.0.10.0070.0308.23
5.0.00.0030.0438.35
4.4.90.0030.0235.95
4.4.80.0070.0275.86
4.4.70.0070.0205.89
4.4.60.0070.0235.89
4.4.50.0000.0275.82
4.4.40.0030.0375.94
4.4.30.0030.0235.82
4.4.20.0070.0275.97
4.4.10.0030.0235.98
4.4.00.0030.0375.90
4.3.110.0030.0275.79
4.3.100.0030.0235.78
4.3.90.0070.0205.78
4.3.80.0030.0335.78
4.3.70.0030.0235.89
4.3.60.0000.0305.87
4.3.50.0070.0205.77
4.3.40.0030.0375.80
4.3.30.0030.0274.99
4.3.20.0000.0274.99
4.3.10.0000.0234.99
4.3.00.0200.03014.62

preferences:
35.5 ms | 401 KiB | 5 Q