3v4l.org

run code in 300+ PHP versions simultaneously
<?php function gen($parents, $children) { $data = array(); $i = 0; for($i; $i < $parents; $i++) { $data[$i] = array( 'indent' => 'test ' . $i, 'depth' => 1 ); } for($i; $i < $children; $i++) { $data[$i] = array( 'indent' => 'test ' . $i, 'depth' => 'x', 'parent_id' => rand(0, $i) ); } return $data; } function v1($array) { foreach ($array as $key => &$sub) { if (isset($sub['parent_id'])) { $array[$sub['parent_id']]['children'][$key] = &$sub; } } unset($sub); // unset the reference to make sure to not overwrite it later... // now remove the entries with parents foreach ($array as $key => $sub) { if (isset($sub['parent_id'])) unset($array[$key]); } return $array; } function push_at_key($what, $what_key, $key, $array) { foreach($array as $k => $v) { if($key == $k) { $array[$k]['children'][$what_key] = $what; return $array; } } foreach($array as $k => $v) { $array[$k] = push_at_key($what, $what_key, $key, $v['children']); } return $array; } function v2($array) { $out = array(); foreach ($array as $key => $sub) { if(!isset($sub['parent_id'])) { $out[$key] = $sub; } else { $out = push_at_key($sub, $key, $sub['parent_id'], $out); } } return $out; } $array = gen(10, 690); var_dump(v1($array)); //var_dump(v2($array));

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)
7.3.10.0060.00916.29
7.3.00.0100.00716.63
7.2.130.0090.00916.93
7.2.120.0110.00616.94
7.2.110.0070.01416.94
7.2.100.0120.00917.06
7.2.90.0110.01116.85
7.2.80.0060.00916.86
7.2.70.0000.01616.98
7.2.60.0120.00617.01
7.2.50.0140.00717.04
7.2.40.0120.00816.75
7.2.30.0080.00816.98
7.2.20.0110.01116.75
7.2.10.0060.00616.93
7.2.00.0130.00518.27
7.1.250.0040.01115.83
7.1.70.0050.00517.16
7.1.60.0220.01119.08
7.1.50.0280.01435.08
7.1.00.0070.05722.25
7.0.200.0060.00616.76
7.0.140.0130.07322.08
7.0.100.0230.08020.57
7.0.90.0200.08320.56
7.0.80.0030.09020.72
7.0.70.0100.08720.51
7.0.60.0130.08020.50
7.0.50.0170.07020.98
7.0.40.0100.07320.12
7.0.30.0200.07720.11
7.0.20.0230.06320.07
7.0.10.0200.07719.98
7.0.00.0170.08020.17
5.6.280.0070.07721.91
5.6.250.0170.08321.72
5.6.240.0170.07721.73
5.6.230.0130.09021.70
5.6.220.0100.08321.66
5.6.210.0230.07321.66
5.6.200.0130.08722.09
5.6.190.0270.06722.19
5.6.180.0070.07322.16
5.6.170.0130.08722.26
5.6.160.0100.08722.14
5.6.150.0100.09022.20
5.6.140.0100.08322.17
5.6.130.0170.07022.19
5.6.120.0170.08022.32
5.6.110.0170.08022.20
5.6.100.0130.08722.27
5.6.90.0230.05722.08
5.6.80.0100.07021.66
5.6.70.0000.05721.54
5.6.60.0130.08021.47
5.6.50.0000.05021.50
5.6.40.0100.07021.58
5.6.30.0070.07021.55
5.6.20.0070.05721.52
5.6.10.0170.07321.55
5.6.00.0030.04721.52
5.5.380.0200.07021.56
5.5.370.0130.06021.61
5.5.360.0100.07321.64
5.5.350.0230.05321.75
5.5.340.0170.08021.93
5.5.330.0270.05722.00
5.5.320.0230.04722.13
5.5.310.0100.06021.98
5.5.300.0170.06321.93
5.5.290.0200.05721.93
5.5.280.0100.08722.05
5.5.270.0100.08722.04
5.5.260.0130.07021.95
5.5.250.0030.09021.61
5.5.240.0070.04021.28
5.5.230.0070.04321.33
5.5.220.0200.05021.31
5.5.210.0270.07321.37
5.5.200.0130.06721.44
5.5.190.0170.03021.42
5.5.180.0130.06021.31
5.5.160.0070.04021.30
5.5.150.0070.03721.27
5.5.140.0130.03321.43
5.5.130.0000.04721.29
5.5.120.0030.04021.22
5.5.110.0000.04321.38
5.5.100.0100.05721.34
5.5.90.0230.08021.25
5.5.80.0130.07721.23
5.5.70.0130.08721.30
5.5.60.0270.05021.38
5.5.50.0200.08321.19
5.5.40.0130.07721.21
5.5.30.0230.07321.25
5.5.20.0070.08321.21
5.5.10.0230.04721.21
5.5.00.0170.07721.25
5.4.450.0200.07720.50
5.4.440.0230.06720.36
5.4.430.0170.05020.33
5.4.420.0130.08020.28
5.4.410.0100.04320.39
5.4.400.0200.05320.22
5.4.390.0330.03720.26
5.4.380.0130.03720.18
5.4.370.0070.03720.14
5.4.360.0170.03720.23
5.4.350.0130.05020.27
5.4.340.0070.04020.19
5.4.320.0100.06720.18
5.4.310.0030.06020.32
5.4.300.0030.06020.18
5.4.290.0130.07320.12
5.4.280.0030.04020.18
5.4.270.0200.05020.39
5.4.260.0130.05720.21
5.4.250.0130.06020.06
5.4.240.0300.06720.25
5.4.230.0170.07720.19
5.4.220.0170.07720.27
5.4.210.0200.07720.12
5.4.200.0130.08020.12
5.4.190.0100.05720.25
5.4.180.0100.06320.20
5.4.170.0130.05020.33
5.4.160.0170.04719.98
5.4.150.0200.06020.18
5.4.140.0270.04017.50
5.4.130.0130.05717.69
5.4.120.0130.07017.55
5.4.110.0070.05717.67
5.4.100.0100.07017.46
5.4.90.0100.07317.50
5.4.80.0200.07317.40
5.4.70.0100.05317.66
5.4.60.0170.04717.66
5.4.50.0100.06017.56
5.4.40.0130.07017.45
5.4.30.0100.07017.61
5.4.20.0100.07317.60
5.4.10.0230.05717.47
5.4.00.0170.07016.85
5.3.290.0070.03315.78
5.3.280.0070.07715.78
5.3.270.0030.07015.78
5.3.260.0200.06715.78
5.3.250.0000.08715.78
5.3.240.0130.08015.78
5.3.230.0170.07715.78
5.3.220.0130.05315.61
5.3.210.0170.05315.63
5.3.200.0100.08715.49
5.3.190.0130.08315.78
5.3.180.0200.07715.61
5.3.170.0130.05715.65
5.3.160.0070.07715.78
5.3.150.0230.04315.60
5.3.140.0170.05715.58
5.3.130.0170.05015.65
5.3.120.0130.05715.73
5.3.110.0130.07715.78
5.3.100.0130.07315.78
5.3.90.0070.07715.78
5.3.80.0130.05315.78
5.3.70.0070.08315.78
5.3.60.0230.04314.90
5.3.50.0100.06014.92
5.3.40.0230.07015.78
5.3.30.0230.05314.93
5.3.20.0070.08015.78
5.3.10.0130.08014.73
5.3.00.0130.05714.82
5.2.170.0200.06312.09
5.2.160.0300.04712.13
5.2.150.0200.05715.78
5.2.140.0230.05012.12
5.2.130.0270.05312.00
5.2.120.0230.05711.95
5.2.110.0070.04711.99
5.2.100.0230.05312.07
5.2.90.0100.04315.78
5.2.80.0100.04711.95
5.2.70.0100.05012.08
5.2.60.0170.03712.05
5.2.50.0070.05315.78
5.2.40.0070.04012.02
5.2.30.0100.06715.78
5.2.20.0070.04311.93
5.2.10.0130.06015.78
5.2.00.0100.06015.78
5.1.60.0170.04315.78
5.1.50.0070.05715.78
5.1.40.0000.06715.78
5.1.30.0030.06315.78
5.1.20.0100.05715.78
5.1.10.0100.05715.78
5.1.00.0030.05015.78
5.0.50.0070.04715.78
5.0.40.0100.04315.78
5.0.30.0100.06015.78
5.0.20.0000.05715.78
5.0.10.0130.04015.78
5.0.00.0100.06315.78
4.4.90.0000.04015.78
4.4.80.0070.03015.78
4.4.70.0030.03715.78
4.4.60.0030.03315.78
4.4.50.0070.03315.78
4.4.40.0070.04315.78
4.4.30.0070.03015.78
4.4.20.0000.03315.78
4.4.10.0030.03715.78
4.4.00.0000.05315.78
4.3.110.0000.03315.78
4.3.100.0000.04015.78
4.3.90.0000.02715.78
4.3.80.0030.04315.78
4.3.70.0100.02015.78
4.3.60.0070.02715.78
4.3.50.0000.03315.78
4.3.40.0100.04315.78
4.3.30.0000.03315.78
4.3.20.0000.04015.78
4.3.10.0070.03015.78
4.3.00.0000.02315.78

preferences:
31.91 ms | 401 KiB | 5 Q