3v4l.org

run code in 300+ PHP versions simultaneously
<?php function is_cyclic(array &$array) { $lastKey = array_key_last($array); if ($lastKey === null) { // Array is empty return false; } static $marker; if ($marker === null) { $marker = new stdClass(); } if ($array[$lastKey] === $marker) { return true; } $array[] = $marker; foreach ($array as &$item) { if (is_array($item) && is_cyclic($item)) { array_pop($array); return true; } } array_pop($array); return false; } // Contains reference to itself $v = [1, 2, 3]; $v[1] = &$v; // Contains nested array with reference to $x $x = [1, [2, 3]]; $x[1][1] = &$x; // Contains nested array with reference to an ancestor $y = [1, [2, [3, 4]]]; $y[1][1][1] = &$y[1]; // Nested array contains reference to itself $z = [1, [2, 3]]; $z[1][1] = &$z[1]; // This array is not recursive $p = [1, 2, [3, 4, [5, 6, 7]]]; foreach (['v', 'x', 'y', 'z', 'p'] as $var) { $arr = &${$var}; echo "Array \$$var | Cyclic: "; var_export(is_cyclic($arr)); echo "\n"; echo "----------------\n"; var_dump($arr); echo "\n\n"; }

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)
8.4.130.0100.01018.75
8.4.120.0110.01020.55
8.4.110.0070.00122.53
8.4.100.0120.00917.79
8.4.90.0120.00822.20
8.4.80.0170.00417.76
8.4.70.0070.01120.46
8.4.60.0090.00718.97
8.4.50.0100.01022.68
8.4.40.0140.00617.68
8.4.30.0120.00320.74
8.4.20.0070.01418.05
8.4.10.0070.00320.65
8.3.260.0120.00816.70
8.3.250.0110.00620.98
8.3.240.0130.00716.43
8.3.230.0090.01016.82
8.3.220.0080.00917.23
8.3.210.0100.00618.42
8.3.200.0060.00516.46
8.3.190.0050.00417.06
8.3.180.0110.01018.64
8.3.170.0090.00917.43
8.3.160.0090.00916.55
8.3.150.0150.00417.18
8.3.140.0030.00517.10
8.3.130.0160.00618.50
8.3.120.0060.00320.84
8.3.110.0060.00316.64
8.3.100.0060.00316.63
8.3.90.0040.00426.77
8.3.80.0030.00619.36
8.3.70.0040.01216.58
8.3.60.0110.00718.28
8.3.50.0110.00824.50
8.3.40.0060.00918.85
8.3.30.0030.01218.84
8.3.20.0050.00324.18
8.3.10.0040.00424.66
8.3.00.0000.00826.16
8.2.290.0100.00820.34
8.2.280.0120.00718.52
8.2.270.0200.00016.64
8.2.260.0120.00618.98
8.2.250.0100.01018.48
8.2.240.0090.00017.02
8.2.230.0100.01020.94
8.2.220.0030.00524.06
8.2.210.0120.00626.77
8.2.200.0000.01118.88
8.2.190.0040.01116.58
8.2.180.0110.00425.92
8.2.170.0060.01018.96
8.2.160.0150.00322.96
8.2.150.0040.00425.66
8.2.140.0040.01124.66
8.2.130.0080.00026.16
8.2.120.0080.00021.02
8.2.110.0070.00322.24
8.2.100.0110.00017.97
8.2.90.0040.00420.46
8.2.80.0040.00420.51
8.2.70.0000.00817.63
8.2.60.0000.00818.16
8.2.50.0100.00718.07
8.2.40.0080.00018.34
8.2.30.0000.00718.27
8.2.20.0080.00018.13
8.2.10.0090.00019.22
8.2.00.0040.00419.19
8.1.330.0110.00921.89
8.1.320.0100.00916.14
8.1.310.0060.00918.57
8.1.300.0130.00316.32
8.1.290.0060.00330.84
8.1.280.0070.00725.92
8.1.270.0050.00323.99
8.1.260.0060.00326.35
8.1.250.0000.00828.09
8.1.240.0070.00319.21
8.1.230.0040.00821.01
8.1.220.0040.00417.77
8.1.210.0040.00418.97
8.1.200.0060.00317.35
8.1.190.0050.00317.22
8.1.180.0060.00318.10
8.1.170.0040.00418.64
8.1.160.0040.00418.91
8.1.150.0000.00818.87
8.1.140.0040.00418.89
8.1.130.0000.00717.45
8.1.120.0080.00017.47
8.1.110.0000.00917.46
8.1.100.0000.00917.35
8.1.90.0040.00417.36
8.1.80.0030.00517.48
8.1.70.0080.00017.46
8.1.60.0040.00417.59
8.1.50.0050.00317.59
8.1.40.0000.00817.41
8.1.30.0040.00417.65
8.1.20.0060.00317.71
8.1.10.0040.00417.50
8.1.00.0040.00417.44
8.0.300.0000.00720.05
8.0.290.0070.00016.75
8.0.280.0000.00718.50
8.0.270.0070.00018.08
8.0.260.0000.00716.88
8.0.250.0060.00317.03
8.0.240.0070.00016.89
8.0.230.0060.00317.00
8.0.220.0050.00316.97
8.0.210.0040.00416.93
8.0.200.0050.00316.89
8.0.190.0030.00617.06
8.0.180.0050.00216.90
8.0.170.0030.00616.96
8.0.160.0070.00016.88
8.0.150.0030.00516.91
8.0.140.0050.00316.86
8.0.130.0000.00613.38
8.0.120.0050.00216.84
8.0.110.0000.00716.94
8.0.100.0040.00417.02
8.0.90.0000.00716.79
8.0.80.0120.00616.93
8.0.70.0050.00316.83
8.0.60.0000.00816.99
8.0.50.0080.00016.76
8.0.30.0120.00617.25
8.0.20.0140.00416.97
8.0.10.0090.00917.09
8.0.00.0060.01916.88
7.4.330.0050.00015.55
7.4.320.0040.00416.52
7.4.300.0030.00316.51
7.4.290.0050.00316.45
7.4.280.0000.00716.57
7.4.270.0030.00616.52
7.4.260.0050.00013.39
7.4.250.0030.00316.46
7.4.240.0000.00716.46
7.4.230.0050.00216.59
7.4.220.0040.00416.32
7.4.210.0030.01016.41
7.4.200.0000.00816.61
7.4.140.0130.00615.93
7.4.130.0120.01216.58
7.4.120.0150.00916.38
7.4.110.0130.01316.43
7.4.100.0070.01016.39
7.4.90.0150.00615.67
7.4.80.0170.00715.78
7.4.70.0070.01315.76
7.4.60.0090.00915.91
7.4.50.0110.01015.92
7.4.40.0250.00016.22
7.4.30.0060.01416.18
7.4.20.0120.00616.05
7.4.10.0160.00616.29
7.4.00.0030.01516.60
7.3.330.0040.00416.33
7.3.320.0000.00613.46
7.3.310.0050.00316.28
7.3.300.0030.00316.39
7.3.290.0040.01016.37
7.3.260.0100.00716.63
7.3.250.0110.01516.34
7.3.240.0150.00916.74
7.3.230.0070.01116.45
7.3.220.0140.00715.89
7.3.210.0090.01616.00
7.3.200.0190.00415.78
7.3.190.0000.02016.25
7.3.180.0100.01016.02
7.3.170.0240.00315.79
7.3.160.0170.00616.11
7.3.150.0120.00916.11
7.3.140.0190.00415.96
7.3.130.0150.00616.11
7.3.120.0180.00315.97
7.3.110.0190.00416.03
7.3.100.0070.01316.05
7.3.90.0140.00816.14
7.3.80.0170.00316.00
7.3.70.0120.00816.14
7.3.60.0080.01116.26
7.3.50.0080.01516.28
7.3.40.0190.00516.25
7.3.30.0130.00816.14
7.3.20.0150.00416.06
7.3.10.0150.00716.04
7.3.00.0150.01216.18

preferences:
28.89 ms | 403 KiB | 5 Q