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 $prevKey; } }); var_dump($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)
8.3.60.0000.01516.50
8.3.50.0100.01222.09
8.3.40.0120.00918.89
8.3.30.0030.01019.09
8.3.20.0040.00420.25
8.3.10.0000.00821.73
8.3.00.0070.00020.95
8.2.180.0160.00616.50
8.2.170.0070.00722.96
8.2.160.0070.01022.28
8.2.150.0000.00924.18
8.2.140.0040.00424.66
8.2.130.0000.00826.16
8.2.120.0040.00419.54
8.2.110.0000.01022.11
8.2.100.0090.00317.50
8.2.90.0050.00319.27
8.2.80.0080.00017.97
8.2.70.0050.00317.50
8.2.60.0050.00318.05
8.2.50.0090.00018.07
8.2.40.0000.00718.21
8.2.30.0030.00618.00
8.2.20.0000.00817.51
8.2.10.0000.00718.00
8.2.00.0040.00417.75
8.1.280.0090.00925.92
8.1.270.0090.00020.73
8.1.260.0000.00726.35
8.1.250.0050.00328.09
8.1.240.0060.00320.88
8.1.230.0110.00017.70
8.1.220.0040.00417.74
8.1.210.0030.00518.77
8.1.200.0060.00317.35
8.1.190.0040.00417.48
8.1.180.0050.00318.10
8.1.170.0030.00618.64
8.1.160.0030.00522.07
8.1.150.0060.00318.65
8.1.140.0070.00017.39
8.1.130.0060.00317.82
8.1.120.0030.00317.48
8.1.110.0030.00517.36
8.1.100.0040.00417.40
8.1.90.0070.00417.52
8.1.80.0080.00017.48
8.1.70.0030.00317.42
8.1.60.0040.00417.60
8.1.50.0040.00417.41
8.1.40.0000.00817.41
8.1.30.0090.00017.65
8.1.20.0070.00017.50
8.1.10.0000.00717.50
8.1.00.0000.00817.35
8.0.300.0040.00418.77
8.0.290.0050.00216.75
8.0.280.0000.00718.36
8.0.270.0040.00417.22
8.0.260.0000.00617.22
8.0.250.0040.00416.96
8.0.240.0030.00616.92
8.0.230.0000.00716.95
8.0.220.0000.00716.90
8.0.210.0060.00316.79
8.0.200.0000.00616.96
8.0.190.0000.00816.91
8.0.180.0040.00416.91
8.0.170.0040.00416.80
8.0.160.0040.00416.89
8.0.150.0000.00716.84
8.0.140.0070.00016.86
8.0.130.0030.00613.34
8.0.120.0080.00016.86
8.0.110.0000.00716.88
8.0.100.0050.00216.84
8.0.90.0040.00416.86
8.0.80.0100.01316.86
8.0.70.0000.00716.76
8.0.60.0090.00016.77
8.0.50.0000.00816.76
8.0.30.0040.00916.96
8.0.20.0070.01417.40
8.0.10.0000.00716.81
8.0.00.0110.00616.61
7.4.330.0020.00215.14
7.4.320.0070.00016.60
7.4.300.0000.00616.51
7.4.290.0000.00716.46
7.4.280.0070.00316.61
7.4.270.0050.00216.52
7.4.260.0000.00716.61
7.4.250.0040.00416.47
7.4.240.0040.00316.48
7.4.230.0000.00716.57
7.4.220.0130.00716.51
7.4.210.0090.01016.57
7.4.200.0040.00416.35
7.4.160.0120.01216.36
7.4.150.0100.01317.40
7.4.140.0070.01017.86
7.4.130.0110.00816.40
7.4.120.0120.00516.43
7.4.110.0170.00716.50
7.4.100.0060.01216.69
7.4.90.0130.00316.38
7.4.80.0070.01016.49
7.4.70.0140.00716.55
7.4.60.0030.01316.47
7.4.50.0000.00816.34
7.4.40.0080.00916.48
7.4.30.0110.01416.71
7.4.00.0030.01314.93
7.3.330.0050.00013.11
7.3.320.0060.00613.23
7.3.310.0000.00716.25
7.3.300.0000.00716.34
7.3.290.0030.00316.31
7.3.280.0080.01116.31
7.3.270.0110.00717.40
7.3.260.0090.00916.54
7.3.250.0100.00716.26
7.3.240.0070.01016.30
7.3.230.0170.00716.39
7.3.210.0070.01016.15
7.3.200.0100.00919.39
7.3.190.0110.00816.66
7.3.180.0110.00516.51
7.3.170.0080.00816.43
7.3.160.0140.00316.43
7.2.330.0030.01616.50
7.2.320.0100.00716.43
7.2.310.0090.00916.80
7.2.300.0030.01316.38
7.2.290.0060.01316.53
7.2.60.0080.00416.78
7.2.00.0100.00719.56
7.1.200.0190.00715.47
7.1.100.0030.00918.15
7.1.70.0000.01017.22
7.1.60.0170.00719.46
7.1.50.0100.01316.90
7.1.00.0070.07322.33
7.0.200.0040.00416.73
7.0.140.0030.03322.13
7.0.60.0070.04319.91
7.0.50.0030.06017.87
7.0.40.0130.07720.18
7.0.30.0070.08020.25
7.0.20.0230.07720.19
7.0.10.0070.04720.12
7.0.00.0070.04720.38
5.6.280.0030.07320.89
5.6.210.0030.05720.52
5.6.200.0130.07318.29
5.6.190.0100.08320.61
5.6.180.0270.04720.51
5.6.170.0270.07320.57
5.6.160.0100.07320.50
5.6.150.0030.08718.19
5.6.140.0000.06018.21
5.6.130.0130.04018.17
5.6.120.0130.06321.02
5.6.110.0070.06721.14
5.6.100.0170.07721.00
5.6.90.0070.07721.02
5.6.80.0030.05720.37
5.5.350.3970.04720.33
5.5.340.0130.05317.92
5.5.330.0070.06720.40
5.5.320.0230.03320.37
5.5.310.0370.08020.48
5.5.300.0070.07318.07
5.5.290.0070.04318.03
5.5.280.0070.05720.73
5.5.270.0030.04720.68
5.5.260.0030.06320.82
5.5.250.0100.07720.69
5.5.240.0270.06020.29
5.4.450.0230.07019.28
5.4.440.0230.05719.41
5.4.430.0200.07719.41
5.4.420.0200.04319.41
5.4.410.0270.06719.19
5.4.400.0200.05019.20
5.4.390.0170.04019.20
5.4.380.0200.07319.20
5.4.370.0200.04718.97
5.4.360.0270.07318.98
5.4.350.0200.05719.22
5.4.340.0270.07019.24
5.4.320.0200.04719.08
5.4.310.0300.06719.31
5.4.300.0330.07019.17
5.4.290.0370.03719.15
5.4.280.0270.07019.14
5.4.270.0300.05319.08
5.4.260.0270.06719.22
5.4.250.0230.03719.05
5.4.240.0300.06318.95
5.4.230.0230.07019.21
5.4.220.0200.05019.22
5.4.210.0300.05719.03
5.4.200.0300.06719.08
5.4.190.0330.07018.86
5.4.180.0300.06718.99
5.4.170.0300.06319.16
5.4.160.0300.07018.82
5.4.150.0270.06319.20
5.4.140.0230.03716.50
5.4.130.0200.03716.50
5.4.120.0230.03716.50
5.4.110.0300.06316.56
5.4.100.0330.06316.20
5.4.90.0270.06016.19
5.4.80.0300.05016.53
5.4.70.0170.04316.54
5.4.60.0230.03316.17
5.4.50.0270.06716.23
5.4.40.0170.04016.38
5.4.30.0300.03716.52
5.4.20.0200.03316.42
5.4.10.0230.04316.32
5.4.00.0270.03015.79
5.3.290.0170.04014.51
5.3.280.0230.04314.46
5.3.270.0200.03714.45
5.3.260.0130.04014.55
5.3.250.0170.03314.56
5.3.240.0200.03314.70
5.3.230.0200.03714.45
5.3.220.0170.03714.55
5.3.210.0170.04014.52
5.3.200.0170.03714.52
5.3.190.0170.03714.51
5.3.180.0300.05714.42
5.3.170.0170.04014.44
5.3.160.0170.03714.66
5.3.150.0200.03714.52
5.3.140.0100.04014.39
5.3.130.0130.04014.56
5.3.120.0170.03714.50
5.3.110.0170.03714.41
5.3.100.0130.04013.88
5.3.90.0170.03713.89
5.3.80.0200.04014.00
5.3.70.0200.03713.79
5.3.60.0130.04014.05
5.3.50.0200.04013.96
5.3.40.0170.04713.82
5.3.30.0170.03313.75
5.3.20.0270.03713.57
5.3.10.0130.04013.45
5.3.00.0230.02713.58
5.2.170.0130.03013.04
5.2.160.0170.02713.04
5.2.150.0200.02313.04
5.2.140.0130.03013.04
5.2.130.0130.03013.04
5.2.120.0100.03313.04
5.2.110.0130.02713.04
5.2.100.0130.02713.04
5.2.90.0100.03313.04
5.2.80.0130.03013.04
5.2.70.0130.03013.04
5.2.60.0100.03313.04
5.2.50.0200.02013.04
5.2.40.0130.02713.04
5.2.30.0100.03013.04
5.2.20.0130.02313.04
5.2.10.0100.03013.04
5.2.00.0030.03313.04
5.1.60.0100.02313.04
5.1.50.0130.02013.04
5.1.40.0130.02013.04
5.1.30.0170.02013.04
5.1.20.0170.02013.04
5.1.10.0100.02713.04
5.1.00.0100.02313.04
5.0.50.0000.02313.04
5.0.40.0070.01713.04
5.0.30.0100.02713.04
5.0.20.0000.02013.04
5.0.10.0070.02313.04
5.0.00.0030.03013.04
4.4.90.0030.01713.04
4.4.80.0070.01313.04
4.4.70.0000.01713.04
4.4.60.0100.00713.04
4.4.50.0070.01313.04
4.4.40.0170.02013.04
4.4.30.0030.01313.04
4.4.20.0000.01713.04
4.4.10.0130.01013.04
4.4.00.0070.02313.04
4.3.110.0030.01713.04
4.3.100.0070.01313.04
4.3.90.0070.01313.04
4.3.80.0070.02713.04
4.3.70.0030.01713.04
4.3.60.0070.01313.04
4.3.50.0070.01313.04
4.3.40.0070.02713.04
4.3.30.0030.01713.04
4.3.20.0000.01713.04
4.3.10.0030.01713.04
4.3.00.0030.01713.04

preferences:
47.91 ms | 401 KiB | 5 Q