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run code in 300+ PHP versions simultaneously
<?php interface ModifierInterface { public function apply(array $data, string $key): array; } class ArrayHelper { public static function mergeReverse(...$args): array { return self::applyModifiers(self::performMergeReverse(...$args)); } public static function merge(...$args): array { return self::applyModifiers(self::performMerge(...$args)); } private static function performMergeReverse(...$args): array { $res = array_pop($args) ?: []; while (!empty($args)) { foreach (array_pop($args) as $k => $v) { if (is_int($k)) { if (array_key_exists($k, $res) && $res[$k] !== $v) { $res[] = $v; } else { $res[$k] = $v; } } elseif (is_array($v) && isset($res[$k]) && is_array($res[$k])) { $res[$k] = self::performMergeReverse($v, $res[$k]); } elseif (!isset($res[$k])) { $res[$k] = $v; } } } return $res; } private static function performMerge(...$args): array { $res = array_shift($args) ?: []; while (!empty($args)) { foreach (array_shift($args) as $k => $v) { if (is_int($k)) { if (array_key_exists($k, $res) && $res[$k] !== $v) { $res[] = $v; } else { $res[$k] = $v; } } elseif (is_array($v) && isset($res[$k]) && is_array($res[$k])) { $res[$k] = self::performMerge($res[$k], $v); } else { $res[$k] = $v; } } } return $res; } public static function applyModifiers(array $data): array { $modifiers = []; foreach ($data as $k => $v) { if ($v instanceof ModifierInterface) { $modifiers[$k] = $v; unset($data[$k]); } elseif (is_array($v)) { $data[$k] = self::applyModifiers($v); } } foreach ($modifiers as $key => $modifier) { $data = $modifier->apply($data, $key); } return $data; } } $one = [ 'f' => 'f1', 'b' => [ 'b1' => 'b11', 'b2' => 'b33', ], 'g' => 'g1', 'h', ]; $two = [ 'a' => 'a1', 'b' => [ 'b1' => 'bv1', 'b2' => 'bv2', ], 'd', ]; $three = [ 'a' => 'a2', 'c' => 'c1', 'b' => [ 'b2' => 'bv22', 'b3' => 'bv3', ], 'e', ]; $result = ArrayHelper::merge($one, $two, $three); var_export($result); echo "\n\n"; $resultPop = ArrayHelper::mergeReverse($one, $two, $three); var_export($resultPop);

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)
8.4.120.0150.00520.48
8.4.110.0040.00622.39
8.4.100.0070.01317.85
8.4.90.0080.00618.79
8.4.80.0120.00817.80
8.4.70.0100.01017.84
8.4.60.0080.00718.91
8.4.50.0090.00919.51
8.4.40.0090.00917.75
8.4.30.0100.01018.73
8.4.20.0180.00417.70
8.4.10.0030.00720.61
8.3.250.0030.00518.95
8.3.240.0130.00616.35
8.3.230.0100.01016.45
8.3.220.0120.00617.14
8.3.210.0090.00716.91
8.3.200.0050.00416.82
8.3.190.0030.00517.41
8.3.180.0110.00816.54
8.3.170.0110.00718.94
8.3.160.0090.00416.38
8.3.150.0070.01120.93
8.3.140.0030.00516.61
8.3.130.0100.01016.50
8.3.120.0040.00719.08
8.3.110.0080.00020.94
8.3.100.0060.00324.06
8.3.90.0040.00426.77
8.3.80.0090.00016.75
8.3.70.0150.00316.75
8.3.60.0100.00616.88
8.3.50.0150.00324.54
8.3.40.0100.00718.91
8.3.30.0030.01718.65
8.3.20.0080.00024.18
8.3.10.0040.00424.66
8.3.00.0050.00326.16
8.2.290.0090.01020.51
8.2.280.0080.01020.14
8.2.270.0040.01219.00
8.2.260.0150.00418.32
8.2.250.0030.00616.69
8.2.240.0060.00318.73
8.2.230.0100.00022.58
8.2.220.0040.00437.54
8.2.210.0000.00826.77
8.2.200.0040.00416.38
8.2.190.0070.01116.88
8.2.180.0120.00325.92
8.2.170.0060.00822.96
8.2.160.0080.01222.96
8.2.150.0030.00625.66
8.2.140.0030.00624.66
8.2.130.0040.00426.16
8.2.120.0050.00326.35
8.2.110.0050.00522.25
8.2.100.0050.00517.82
8.2.90.0030.00617.75
8.2.80.0050.00317.97
8.2.70.0090.00017.50
8.2.60.0050.00317.63
8.2.50.0000.00818.05
8.2.40.0040.00420.00
8.2.30.0000.00718.03
8.2.20.0000.00718.15
8.2.10.0000.00719.38
8.2.00.0050.00219.33
8.1.330.0120.00722.07
8.1.320.0140.00716.26
8.1.310.0040.00418.29
8.1.300.0030.00617.70
8.1.290.0060.00318.88
8.1.280.0060.00925.92
8.1.270.0080.00023.99
8.1.260.0070.00028.09
8.1.250.0040.00428.09
8.1.240.0030.00622.09
8.1.230.0110.00219.14
8.1.220.0000.00817.74
8.1.210.0000.00818.77
8.1.200.0040.00817.48
8.1.190.0000.00817.13
8.1.180.0040.00418.10
8.1.170.0040.00419.00
8.1.160.0080.00018.91
8.1.150.0040.00418.96
8.1.140.0050.00218.90
8.1.130.0030.00520.27
8.1.120.0040.00417.39
8.1.110.0070.00017.40
8.1.100.0000.00717.54
8.1.90.0030.00317.34
8.1.80.0060.00317.47
8.1.70.0000.00717.49
8.1.60.0040.00417.64
8.1.50.0060.00317.57
8.1.40.0000.00817.55
8.1.30.0030.00617.72
8.1.20.0090.00017.65
8.1.10.0040.00417.63
8.1.00.0030.00617.58
8.0.300.0050.00321.49
8.0.290.0000.00816.75
8.0.280.0030.00518.39
8.0.270.0040.00418.10
8.0.260.0070.00020.28
8.0.250.0030.00316.90
8.0.240.0070.00016.88
8.0.230.0030.00316.90
8.0.220.0030.00316.89
8.0.210.0030.00316.93
8.0.200.0000.00716.99
8.0.190.0040.00417.02
8.0.180.0080.00016.97
8.0.170.0090.00016.91
8.0.160.0000.00816.84
8.0.150.0040.00416.75
8.0.140.0040.00416.79
8.0.130.0000.00613.36
8.0.120.0000.00816.88
8.0.110.0000.00816.91
8.0.100.0000.00816.93
8.0.90.0030.00616.80
8.0.80.0100.00416.80
8.0.70.0000.00716.77
8.0.60.0000.00916.94
8.0.50.0000.00716.98
8.0.30.0110.00717.09
8.0.20.0090.01217.02
8.0.10.0030.00517.06
8.0.00.0100.01016.85
7.4.330.0050.00015.55
7.4.320.0030.00316.65
7.4.300.0030.00316.66
7.4.290.0040.00416.63
7.4.280.0050.00216.63
7.4.270.0040.00416.55
7.4.260.0030.00313.30
7.4.250.0070.00016.56
7.4.240.0040.00416.53
7.4.230.0000.00716.44
7.4.220.0050.00216.50
7.4.210.0040.01216.53
7.4.200.0040.00416.53
7.4.130.0110.00816.54
7.4.120.0090.00916.70
7.4.110.0030.01316.64
7.4.100.0130.00616.58
7.4.90.0060.01616.59
7.4.80.0170.00319.39
7.4.70.0100.00616.45
7.4.60.0130.00316.55
7.4.50.0000.01716.42
7.4.40.0080.00816.51
7.4.30.0030.01416.58
7.4.20.0070.01016.50
7.4.10.0100.00616.58
7.4.00.0120.00316.55
7.3.330.0040.00416.31
7.3.320.0000.00513.39
7.3.310.0030.00316.28
7.3.300.0070.00016.23
7.3.290.0080.00516.38
7.3.260.0090.00916.56
7.3.240.0090.01116.43
7.3.230.0130.00716.48
7.3.210.0060.01216.54
7.3.200.0140.00416.52
7.3.190.0110.00816.41
7.3.180.0000.01516.58
7.3.170.0090.00616.62
7.3.160.0080.00816.65
7.3.150.0060.00916.38
7.3.140.0000.01616.63
7.3.130.0080.00816.62
7.3.120.0050.01016.34
7.3.110.0070.01016.57
7.3.100.0090.00916.34
7.3.90.0060.01116.34
7.3.80.0120.00316.53
7.3.70.0090.00616.45
7.3.60.0060.00916.41
7.3.50.0100.00716.36
7.3.40.0100.01316.47
7.3.30.0090.00616.56
7.3.20.0100.00716.43
7.3.10.0080.01216.50
7.3.00.0060.01316.43
7.2.330.0080.01416.72
7.2.320.0090.00916.80
7.2.310.0070.01016.59
7.2.300.0070.01016.67
7.2.290.0060.01016.50
7.2.280.0070.01016.89
7.2.270.0070.01016.73
7.2.260.0070.01016.51
7.2.250.0140.00316.58
7.2.240.0100.00716.60
7.2.230.0140.00316.82
7.2.220.0080.00816.57
7.2.210.0120.00416.54
7.2.200.0130.00416.75
7.2.190.0040.01216.69
7.2.180.0130.00316.54
7.2.170.0130.00316.59
7.2.160.0070.01016.57
7.2.150.0100.00716.61
7.2.140.0120.00616.59
7.2.130.0080.01116.66
7.2.120.0100.01016.77
7.2.110.0080.00816.68
7.2.100.0180.00016.76
7.2.90.0120.00916.74
7.2.80.0100.00616.66
7.2.70.0080.00816.73
7.2.60.0090.00616.59
7.2.50.0110.00616.58
7.2.40.0140.00316.64
7.2.30.0140.00316.66
7.2.20.0120.00416.66
7.2.10.0080.00816.61
7.2.00.0160.00016.64

preferences:
25.63 ms | 403 KiB | 5 Q