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, &$prevKey) { if (!is_array($value)) { }else { $prevKey = $key; echo $key; } }); var_dump($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)
8.3.60.0060.00916.75
8.3.50.0090.01321.95
8.3.40.0110.00418.70
8.3.30.0080.00818.92
8.3.20.0080.00020.24
8.3.10.0090.00021.64
8.3.00.0040.00420.96
8.2.180.0100.01316.50
8.2.170.0110.00422.96
8.2.160.0040.01122.10
8.2.150.0060.00324.18
8.2.140.0050.00324.66
8.2.130.0080.00026.16
8.2.120.0040.00419.68
8.2.110.0000.00920.52
8.2.100.0030.00918.22
8.2.90.0040.00418.89
8.2.80.0030.00617.97
8.2.70.0090.00017.50
8.2.60.0030.00517.93
8.2.50.0090.00018.07
8.2.40.0040.00419.82
8.2.30.0000.00818.04
8.2.20.0080.00017.73
8.2.10.0000.00818.12
8.2.00.0000.00717.62
8.1.280.0100.00725.92
8.1.270.0030.00618.87
8.1.260.0110.00326.35
8.1.250.0000.00728.09
8.1.240.0060.00322.13
8.1.230.0080.00419.15
8.1.220.0040.00417.74
8.1.210.0000.00818.77
8.1.200.0000.00817.23
8.1.190.0050.00317.13
8.1.180.0040.00418.10
8.1.170.0040.00418.50
8.1.160.0030.00522.07
8.1.150.0040.00418.91
8.1.140.0000.00717.46
8.1.130.0000.00817.83
8.1.120.0030.00317.36
8.1.110.0080.00017.44
8.1.100.0000.00717.30
8.1.90.0040.00417.43
8.1.80.0000.00717.46
8.1.70.0070.00017.45
8.1.60.0050.00217.60
8.1.50.0060.00317.54
8.1.40.0030.00517.38
8.1.30.0000.00817.58
8.1.20.0070.00017.54
8.1.10.0040.00417.46
8.1.00.0030.00617.43
8.0.300.0060.00318.77
8.0.290.0000.00816.63
8.0.280.0070.00018.44
8.0.270.0000.00817.25
8.0.260.0070.00017.36
8.0.250.0000.00716.89
8.0.240.0000.00716.82
8.0.230.0000.00716.96
8.0.220.0000.00716.79
8.0.210.0040.00416.85
8.0.200.0060.00016.91
8.0.190.0030.00516.84
8.0.180.0040.00416.75
8.0.170.0040.00416.84
8.0.160.0000.00716.78
8.0.150.0030.00316.84
8.0.140.0040.00416.90
8.0.130.0000.00613.35
8.0.120.0040.00416.87
8.0.110.0040.00416.89
8.0.100.0050.00216.93
8.0.90.0030.00316.74
8.0.80.0110.00616.80
8.0.70.0040.00416.84
8.0.60.0040.00416.72
8.0.50.0040.00416.89
8.0.30.0090.00917.12
8.0.20.0130.01317.40
8.0.10.0000.00716.79
8.0.00.0050.01216.76
7.4.330.0000.00515.03
7.4.320.0020.00516.51
7.4.300.0070.00016.61
7.4.290.0050.00316.53
7.4.280.0070.00416.59
7.4.270.0000.00716.55
7.4.260.0040.00416.62
7.4.250.0040.00416.46
7.4.240.0070.00016.58
7.4.230.0070.00016.71
7.4.220.0110.01516.61
7.4.210.0080.01016.62
7.4.200.0000.00716.30
7.4.160.0090.01416.30
7.4.150.0160.02617.40
7.4.140.0090.00817.86
7.4.130.0130.00516.57
7.4.120.0160.00416.45
7.4.110.0180.00616.54
7.4.100.0040.01416.45
7.4.90.0060.00916.47
7.4.80.0070.01016.49
7.4.70.0110.01416.46
7.4.60.0110.00716.57
7.4.50.0040.00416.37
7.4.40.0070.01116.42
7.4.30.0080.01616.57
7.4.00.0080.00414.78
7.3.330.0060.00013.13
7.3.320.0060.00613.23
7.3.310.0000.00716.39
7.3.300.0000.00616.24
7.3.290.0000.00716.16
7.3.280.0060.01216.25
7.3.270.0110.00917.40
7.3.260.0070.01016.52
7.3.250.0090.00916.46
7.3.240.0090.00616.50
7.3.230.0130.00716.52
7.3.210.0100.00716.46
7.3.200.0200.00319.39
7.3.190.0130.00616.36
7.3.180.0030.01416.30
7.3.170.0120.00616.42
7.3.160.0090.00916.25
7.2.330.0170.00016.71
7.2.320.0100.00716.55
7.2.310.0060.01216.51
7.2.300.0130.00316.57
7.2.290.0110.01116.51
7.2.60.0120.00916.41
7.2.00.0030.00919.23
7.1.200.0030.00615.55
7.1.100.0040.00718.34
7.1.70.0070.01017.33
7.1.60.0120.01219.46
7.1.50.0040.01216.89
7.1.00.0030.07322.48
7.0.200.0060.00316.74
7.0.140.0030.03322.00
7.0.60.0030.08019.88
7.0.50.0030.04017.90
7.0.40.0130.08020.10
7.0.30.0370.07320.30
7.0.20.0200.09020.19
7.0.10.0130.04320.21
7.0.00.0000.04320.32
5.6.280.0030.07321.12
5.6.210.0170.05320.76
5.6.200.0070.06318.16
5.6.190.0070.04020.61
5.6.180.0070.04020.51
5.6.170.0100.04720.50
5.6.160.0030.04320.57
5.6.150.0070.07718.14
5.6.140.0100.04318.27
5.6.130.0100.06318.15
5.6.120.0100.08020.97
5.6.110.0070.09020.99
5.6.100.0100.08020.96
5.6.90.0000.04321.00
5.6.80.0130.07320.41
5.6.70.0070.03020.36
5.5.350.0070.06720.34
5.5.340.0070.06318.09
5.5.330.0070.03720.57
5.5.320.0330.04720.27
5.5.310.0370.05320.34
5.5.300.0070.05717.94
5.5.290.0030.04317.98
5.5.280.0070.08720.82
5.5.270.0030.04720.77
5.5.260.0130.08320.87
5.5.250.0130.06020.62
5.5.240.0030.06720.19
5.4.450.0270.04719.55
5.4.440.0330.06319.54
5.4.430.0370.06019.54
5.4.420.0130.06019.38
5.4.410.0230.07719.42
5.4.400.0330.04319.00
5.4.390.0230.05719.00
5.4.380.0270.05019.17
5.4.370.0370.07019.09
5.4.360.0270.05019.23
5.4.350.0330.03019.16
5.4.340.0330.07018.87
5.4.320.0330.06318.86
5.4.310.0270.06319.21
5.4.300.0270.04719.14
5.4.290.0270.03719.13
5.4.280.0270.04719.24
5.4.270.0230.07718.99
5.4.260.0370.03719.19
5.4.250.0270.04718.85
5.4.240.0200.04318.93
5.4.230.0270.06719.22
5.4.220.0300.07318.98
5.4.210.0330.04319.22
5.4.200.0300.07019.14
5.4.190.0330.06019.15
5.4.180.0300.07019.15
5.4.170.0330.07018.86
5.4.160.0330.06019.29
5.4.150.0330.05019.05
5.4.140.0170.04016.37
5.4.130.0270.03016.35
5.4.120.0170.04016.35
5.4.110.0330.06316.51
5.4.100.0330.06716.58
5.4.90.0370.06016.45
5.4.80.0270.06716.43
5.4.70.0330.05716.46
5.4.60.0270.04716.35
5.4.50.0300.06716.43
5.4.40.0300.05316.51
5.4.30.0400.06016.50
5.4.20.0230.03316.52
5.4.10.0200.04316.23
5.4.00.0230.04315.86
5.3.290.0270.05014.61
5.3.280.0500.04714.43
5.3.270.0300.06714.59
5.3.260.0270.07314.52
5.3.250.0270.03314.64
5.3.240.0200.04014.45
5.3.230.0230.03714.55
5.3.220.0330.06714.52
5.3.210.0370.06714.50
5.3.200.0270.07314.66
5.3.190.0370.06714.62
5.3.180.0370.05014.53
5.3.170.0330.05314.50
5.3.160.0300.05714.41
5.3.150.0230.05714.55
5.3.140.0300.06314.46
5.3.130.0300.03314.50
5.3.120.0170.04314.40
5.3.110.0300.07014.40
5.3.100.0270.05014.09
5.3.90.0200.03714.11
5.3.80.0200.04013.81
5.3.70.0200.03313.84
5.3.60.0230.03713.88
5.3.50.0170.03713.76
5.3.40.0200.03313.89
5.3.30.0200.04013.86
5.3.20.0170.03713.54
5.3.10.0270.03713.74
5.3.00.0170.04713.66
5.2.170.0130.03011.92
5.2.160.0100.04311.92
5.2.150.0130.03011.92
5.2.140.0170.03311.92
5.2.130.0130.03011.92
5.2.120.0270.02311.92
5.2.110.0130.03311.92
5.2.100.0170.02711.92
5.2.90.0170.06011.92
5.2.80.0270.05311.92
5.2.70.0270.02711.92
5.2.60.0170.06311.92
5.2.50.0170.03011.92
5.2.40.0130.03311.92
5.2.30.0130.02711.92
5.2.20.0170.02311.92
5.2.10.0100.03011.92
5.2.00.0170.02711.92
5.1.60.0100.02311.92
5.1.50.0100.02711.92
5.1.40.0130.02711.92
5.1.30.0130.03011.92
5.1.20.0130.02311.92
5.1.10.0170.03011.92
5.1.00.0170.03011.92
5.0.50.0070.02011.92
5.0.40.0070.02011.92
5.0.30.0100.03311.92
5.0.20.0030.02011.92
5.0.10.0030.02011.92
5.0.00.0030.03011.92
4.4.90.0030.01711.92
4.4.80.0070.02011.92
4.4.70.0030.01711.92
4.4.60.0030.01711.92
4.4.50.0100.01011.92
4.4.40.0030.02711.92
4.4.30.0070.01311.92
4.4.20.0030.01711.92
4.4.10.0100.01311.92
4.4.00.0100.02011.92
4.3.110.0100.01711.92
4.3.100.0000.02011.92
4.3.90.0070.01311.92
4.3.80.0070.02311.92
4.3.70.0070.01311.92
4.3.60.0130.01011.92
4.3.50.0070.01711.92
4.3.40.0070.02711.92
4.3.30.0030.01711.92
4.3.20.0000.01711.92
4.3.10.0030.01311.92
4.3.00.0030.01311.92

preferences:
53.84 ms | 401 KiB | 5 Q