3v4l.org

run code in 300+ PHP versions simultaneously
<?php $items = [ ['item1' => 'a', 'item2' => 'c', 'item3' => 'd2', 'item4' => 'f'], ['item1' => 'a', 'item2' => 'c', 'item3' => 'd2', 'item4' => 'g'], ['item1' => 'a', 'item2' => 'd', 'item3' => 'd3', 'item4' => 'h'], ['item1' => 'a', 'item2' => 'd', 'item3' => 'e', 'item4' => 'i'], ['item1' => 'b', 'item2' => 'c', 'item3' => 'e', 'item4' => 'j'], ['item1' => 'b', 'item2' => 'c', 'item3' => 'e', 'item4' => 'k'] ]; $result = []; foreach ($items as $row) { $k1 = $row['item1']; $k2 = $row['item1'] . '_' . $row['item2']; $k3 = $row['item1'] . '_' . $row['item2'] . '_' . $row['item3']; if (!isset($ref3[$k3])) { $ref3[$k3] = [$row['item3'], [$row['item4']]]; if (!isset($ref2[$k2])) { $ref2[$k2] = [$row['item2'], &$ref3[$k3]]; if (!isset($ref1[$k1])) { $ref1[$k1] = [$row['item1'], &$ref2[$k2]]; $result[] = &$ref1[$k1]; } else { $ref1[$k1][] = &$ref2[$k2]; } } else { $ref2[$k2][1][] = &$ref3[$k3]; } } else { $ref3[$k3][1][] = $row['item4']; } } echo json_encode($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)
8.4.120.0050.00322.64
8.4.110.0130.00622.28
8.4.100.0120.00917.45
8.4.90.0170.00318.54
8.4.80.0060.00319.70
8.4.70.0090.01417.79
8.4.60.0140.01217.60
8.4.50.0140.00617.63
8.4.40.0190.00020.46
8.4.30.0130.00722.08
8.4.20.0060.01017.63
8.4.10.0030.00523.88
8.3.250.0040.00419.08
8.3.240.0110.00717.00
8.3.230.0100.00816.26
8.3.220.0090.00817.12
8.3.210.0080.01116.67
8.3.200.0110.00817.22
8.3.190.0120.00716.60
8.3.180.0130.00716.51
8.3.170.0190.00018.81
8.3.160.0110.00716.54
8.3.150.0160.00618.79
8.3.140.0130.00618.36
8.3.130.0030.00618.40
8.3.120.0060.00318.91
8.3.110.0040.00420.94
8.3.100.0060.00324.06
8.3.90.0060.00326.77
8.3.80.0000.01018.55
8.3.70.0120.00318.41
8.3.60.0150.00016.50
8.3.50.0120.00916.38
8.3.40.0090.00620.47
8.3.30.0100.00321.03
8.3.20.0040.00424.18
8.3.10.0080.00024.66
8.3.00.0050.00326.16
8.2.290.0050.00420.47
8.2.280.0110.00816.57
8.2.270.0070.01117.26
8.2.260.0150.00418.68
8.2.250.0030.00616.69
8.2.240.0030.00619.20
8.2.230.0040.00422.58
8.2.220.0000.00837.54
8.2.210.0130.00726.77
8.2.200.0060.00616.50
8.2.190.0090.00616.63
8.2.180.0110.00716.63
8.2.170.0090.00918.91
8.2.160.0100.00722.96
8.2.150.0070.00025.66
8.2.140.0000.00824.66
8.2.130.0080.00026.16
8.2.120.0040.00419.36
8.2.110.0100.00021.06
8.2.100.0080.00417.84
8.2.90.0060.00318.03
8.2.80.0040.00418.16
8.2.70.0030.00517.63
8.2.60.0110.00717.25
8.2.50.0090.00917.47
8.2.40.0060.01117.48
8.2.30.0180.00017.34
8.2.20.0120.00617.38
8.2.10.0170.00017.38
8.2.00.0030.01317.63
8.1.330.0110.00622.03
8.1.320.0080.01116.35
8.1.310.0140.00416.45
8.1.300.0030.00620.23
8.1.290.0030.00618.88
8.1.280.0070.00725.92
8.1.270.0050.00324.66
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0060.00323.87
8.1.230.0110.00020.90
8.1.220.0000.00817.78
8.1.210.0030.00618.77
8.1.200.0060.00317.35
8.1.190.0130.00517.25
8.1.180.0140.00517.22
8.1.170.0170.00317.25
8.1.160.0120.00717.10
8.1.150.0130.00517.38
8.1.140.0150.00216.88
8.1.130.0140.00517.00
8.1.120.0140.00317.23
8.1.110.0110.00617.36
8.1.100.0180.00017.13
8.1.90.0120.00417.13
8.1.80.0120.00417.34
8.1.70.0130.00317.23
8.1.60.0090.00917.59
8.1.50.0110.00717.35
8.1.40.0090.00917.38
8.1.30.0140.00317.38
8.1.20.0160.00317.50
8.1.10.0090.00917.38
8.1.00.0130.00617.38
8.0.300.0040.00420.00
8.0.290.0070.00016.75
8.0.280.0160.00016.52
8.0.270.0170.00016.52
8.0.260.0170.00016.52
8.0.250.0120.00416.52
8.0.240.0100.00716.52
8.0.230.0130.00616.52
8.0.220.0070.01116.52
8.0.210.0090.00916.63
8.0.200.0110.00616.52
8.0.190.0170.00016.52
8.0.180.0150.00316.75
8.0.170.0120.00616.52
8.0.160.0120.00516.63
8.0.150.0140.00316.52
8.0.140.0170.00016.63
8.0.130.0120.00416.74
8.0.120.0120.00416.52
8.0.110.0110.00516.52
8.0.100.0110.00516.63
8.0.90.0130.00316.61
8.0.80.0130.00216.52
8.0.70.0100.00516.52
8.0.60.0130.00316.52
8.0.50.0110.00516.60
8.0.30.0170.00016.52
8.0.20.0080.00816.59
8.0.10.0160.00016.52

preferences:
27.7 ms | 403 KiB | 5 Q