3v4l.org

run code in 300+ PHP versions simultaneously
<?php // use ORDER BY belongs_to DESC, id ASC ... or usort() to prepare result set $resultset = [ ['id' => '6a', 'belongs_to' => '5a'], ['id' => '5a', 'belongs_to' => '3a'], ['id' => '8a', 'belongs_to' => '3a'], ['id' => '3a', 'belongs_to' => '1a'], ['id' => '1a', 'belongs_to' => null], ['id' => '2a', 'belongs_to' => null], ['id' => '4a', 'belongs_to' => null], ['id' => '7a', 'belongs_to' => null] ]; foreach ($resultset as $index1 => &$row1) { // make input array modifiable by reference (not working with a copy) if ($row1['belongs_to']) { // original belongs_to value is not null (not a top-level parent) foreach ($resultset as $index2 => $row2) { // search for targeted parent if ($row2['id'] == $row1['belongs_to']) { // parent found $resultset[$index2]['children'][] = [$row1['id'] => $row1['children'] ?? []]; // store original row as child unset($resultset[$index1]); // remove original row (no reason to iterate it again in outer loop) break; // halt inner loop (no reason to iterate further) } } } else { // original belongs_to value is null (top-level parent) $output[$row1['id']] = $row1['children'] ?? []; // store children to top } } var_export($output);

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)
8.5.20.0100.00819.12
8.5.10.0120.00716.57
8.5.00.0130.01420.21
8.4.170.0140.00824.04
8.4.160.0140.00923.92
8.4.150.0030.00014.05
8.4.140.0160.00517.62
8.4.130.0050.00717.68
8.4.120.0150.00522.39
8.4.110.0090.00318.96
8.4.100.0080.01117.79
8.4.90.0040.00820.50
8.4.80.0060.00318.75
8.4.70.0100.01120.68
8.4.60.0100.01118.77
8.4.50.0110.00718.80
8.4.40.0100.01019.38
8.4.30.0050.00317.66
8.4.20.0000.01018.61
8.4.10.0150.00617.49
8.3.300.0100.01218.97
8.3.290.0120.01020.82
8.3.280.0100.01020.03
8.3.270.0130.00816.86
8.3.260.0150.00516.41
8.3.250.0070.01118.91
8.3.240.0160.00416.82
8.3.230.0110.00816.53
8.3.220.0090.01019.14
8.3.210.0120.00718.38
8.3.200.0040.00516.36
8.3.190.0040.00417.34
8.3.180.0070.01219.16
8.3.170.0150.00416.59
8.3.160.0090.00917.29
8.3.150.0110.00718.98
8.3.140.0070.00719.24
8.3.130.0080.00016.55
8.3.120.0070.00418.85
8.3.110.0090.00020.94
8.3.100.0040.00416.79
8.3.90.0040.00418.53
8.3.80.0030.00718.18
8.3.70.0130.00916.48
8.3.60.0070.01418.06
8.3.50.0070.00917.31
8.3.40.0070.00718.47
8.3.30.0100.01018.59
8.3.20.0000.00719.19
8.3.10.0040.00421.70
8.3.00.0050.00320.57
8.2.300.0080.01318.76
8.2.290.0090.00918.99
8.2.280.0110.00818.54
8.2.270.0120.00622.16
8.2.260.0070.01116.42
8.2.250.0000.00816.90
8.2.240.0050.00216.98
8.2.230.0040.00422.58
8.2.220.0030.00524.06
8.2.210.0150.00026.77
8.2.200.0090.00016.63
8.2.190.0120.00916.88
8.2.180.0110.00718.05
8.2.170.0080.00822.96
8.2.160.0110.00422.14
8.2.150.0080.00024.18
8.2.140.0000.00824.66
8.2.130.0000.00819.95
8.2.120.0090.00026.35
8.2.110.0000.01120.35
8.2.100.0080.00417.78
8.2.90.0000.00817.63
8.2.80.0040.00417.97
8.2.70.0080.00018.03
8.2.60.0030.00618.16
8.2.50.0000.00818.10
8.2.40.0060.00319.48
8.2.30.0040.00419.37
8.2.20.0030.00518.01
8.2.10.0050.00318.01
8.2.00.0000.00817.77
8.1.340.0100.01020.06
8.1.330.0110.00916.50
8.1.320.0120.00916.25
8.1.310.0150.00316.70
8.1.300.0110.00817.93
8.1.290.0060.00318.88
8.1.280.0110.00625.92
8.1.270.0080.00022.11
8.1.260.0080.00026.35
8.1.250.0040.00428.09
8.1.240.0100.00023.86
8.1.230.0040.00823.98
8.1.220.0000.00817.78
8.1.210.0030.00618.77
8.1.200.0030.00617.35
8.1.190.0040.00417.38
8.1.180.0000.00818.10
8.1.170.0080.00018.46
8.1.160.0040.00418.83
8.1.150.0000.00818.89
8.1.140.0030.00322.17
8.1.130.0030.00320.28
8.1.120.0000.00717.46
8.1.110.0050.00217.44
8.1.100.0040.00417.43
8.1.90.0000.00717.43
8.1.80.0050.00317.44
8.1.70.0040.00417.42
8.1.60.0040.00417.52
8.1.50.0040.00417.42
8.1.40.0040.00417.54
8.1.30.0080.00317.55
8.1.20.0080.00017.55
8.1.10.0050.00317.52
8.1.00.0030.00617.34
8.0.300.0000.00818.77
8.0.290.0000.00816.63
8.0.280.0000.00818.45
8.0.270.0000.00717.14
8.0.260.0050.00318.46
8.0.250.0030.00316.96
8.0.240.0060.00016.88
8.0.230.0030.00316.98
8.0.220.0030.00616.89
8.0.210.0000.00716.91
8.0.200.0040.00416.95
8.0.190.0000.00716.85
8.0.180.0040.00416.93
8.0.170.0000.00816.84
8.0.160.0000.00716.79
8.0.150.0030.00716.81
8.0.140.0000.00716.77
8.0.130.0000.00513.34
8.0.120.0040.00416.81
8.0.110.0040.00416.89
8.0.100.0080.00016.75
8.0.90.0040.00416.96
8.0.80.0040.01216.87
8.0.70.0070.00016.79
8.0.60.0040.00416.87
8.0.50.0040.00416.75
8.0.30.0140.00317.05
8.0.20.0040.01517.40
8.0.10.0070.00017.04
8.0.00.0120.00616.76
7.4.330.0020.00215.55
7.4.320.0030.00316.45
7.4.300.0030.00316.58
7.4.290.0000.00716.52
7.4.280.0000.00816.60
7.4.270.0040.00416.61
7.4.260.0030.00316.52
7.4.250.0070.00016.48
7.4.240.0000.00816.63
7.4.230.0000.00816.43
7.4.220.0000.00816.50
7.4.210.0060.01016.57
7.4.200.0040.00416.36
7.4.160.0100.00716.54
7.4.140.0120.00617.86
7.4.130.0110.00616.63
7.4.120.0110.00916.58
7.4.110.0060.01216.55
7.4.100.0110.01216.45
7.4.90.0080.00916.78
7.4.80.0110.00819.39
7.4.70.0070.01016.47
7.4.60.0100.00616.54
7.4.50.0100.00716.52
7.4.40.0130.00916.55
7.4.00.0070.01114.74
7.3.330.0000.00513.12
7.3.320.0000.00513.26
7.3.310.0030.00316.39
7.3.300.0030.00316.25
7.3.290.0070.00016.34
7.3.280.0060.00916.34
7.3.260.0080.00916.40
7.3.240.0100.00916.56
7.3.230.0170.00016.69
7.3.210.0150.00716.40
7.3.200.0030.01316.41
7.3.190.0160.00716.34
7.3.180.0060.01616.40
7.3.170.0000.01616.58
7.3.160.0110.00616.73
7.2.330.0030.01316.79
7.2.320.0060.01416.58
7.2.310.0110.00716.53
7.2.300.0110.00416.59
7.2.290.0070.01416.63
7.2.110.1090.01014.80
7.2.100.1030.00314.73
7.2.90.0770.00714.70
7.2.80.0880.01014.63
7.2.70.0770.00714.89
7.2.60.0630.00614.48
7.2.50.0750.00915.14
7.2.40.0950.00614.79
7.2.30.0650.00914.85
7.2.20.0620.00915.06
7.2.10.0670.00315.05
7.2.00.0560.01314.98
7.1.230.1090.00614.09
7.1.220.0750.00713.92
7.1.210.1110.00314.05
7.1.200.0840.01013.65
7.1.190.0620.00313.92
7.1.180.0620.00713.76
7.1.170.0900.00713.95
7.1.160.0610.01014.04
7.1.150.0870.00713.88
7.1.140.0600.01313.86
7.1.130.0750.00514.05
7.1.120.0670.00313.96
7.1.110.0610.01013.90
7.1.100.0560.01113.68
7.1.90.0840.00713.76
7.1.80.0510.01313.57
7.1.70.0780.00013.90
7.1.60.0800.02231.86
7.1.50.1250.01031.88
7.1.40.1130.01331.88
7.1.30.1350.00431.70
7.1.20.1340.01031.74
7.1.10.0820.01413.77
7.1.00.0700.01013.59
5.6.380.0070.00713.84

preferences:
164.29 ms | 403 KiB | 5 Q