3v4l.org

run code in 300+ PHP versions simultaneously
<?php function get_refcount(&$v) { ob_start(); debug_zval_dump($v); $m = null; preg_match('@refcount\(\d+\)@', ob_get_clean(), $m); return $m[1]; } function func(&$data) { foreach ($data as $key => $value) { if (is_array($value)) { func($data[$key]); } } } $data = [ ['k' => [0]], ['k' => [1]], ]; echo get_refcount($data[1]['k']); //refcount(2) func($data); echo get_refcount($data[1]['k']); //refcount(3) array_replace_recursive($data[0], $data[1]); echo json_encode($data);

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)
8.3.60.0070.00717.00
8.3.50.0110.00921.18
8.3.40.0140.00719.27
8.3.30.0140.00018.99
8.3.20.0080.00020.35
8.3.10.0080.00021.55
8.3.00.0090.00023.45
8.2.180.0090.01216.61
8.2.170.0140.00022.96
8.2.160.0070.00720.28
8.2.150.0090.00024.18
8.2.140.0000.00824.66
8.2.130.0070.00019.88
8.2.120.0040.00426.35
8.2.110.0030.00621.07
8.2.100.0110.00017.93
8.2.90.0040.00419.35
8.2.80.0080.00017.97
8.2.70.0090.00017.75
8.2.60.0040.00418.03
8.2.50.0000.01218.07
8.2.40.0000.00822.12
8.2.30.0080.00019.51
8.2.20.0040.00417.84
8.2.10.0090.00018.02
8.2.00.0000.00718.03
8.1.280.0120.00325.92
8.1.270.0070.00723.70
8.1.260.0060.00328.09
8.1.250.0070.00028.09
8.1.240.0030.00722.54
8.1.230.0040.00719.18
8.1.220.0050.00317.74
8.1.210.0030.00518.77
8.1.200.0060.00317.47
8.1.190.0040.00417.36
8.1.180.0030.00618.10
8.1.170.0030.00518.78
8.1.160.0050.00320.79
8.1.150.0080.00018.82
8.1.140.0000.00819.59
8.1.130.0080.00017.70
8.1.120.0070.00017.46
8.1.110.0040.00417.50
8.1.100.0060.00317.65
8.1.90.0000.00817.66
8.1.80.0050.00217.63
8.1.70.0030.00617.57
8.1.60.0030.00617.70
8.1.50.0000.00817.59
8.1.40.0040.00417.63
8.1.30.0080.00017.79
8.1.20.0000.00817.73
8.1.10.0030.00617.61
8.1.00.0000.00717.73
8.0.300.0000.00718.77
8.0.290.0050.00516.87
8.0.280.0040.00418.47
8.0.270.0070.00017.34
8.0.260.0030.00317.18
8.0.250.0000.00717.22
8.0.240.0040.00417.21
8.0.230.0000.00717.12
8.0.220.0000.00717.14
8.0.210.0000.00717.09
8.0.200.0030.00617.06
8.0.190.0050.00217.05
8.0.180.0090.00017.09
8.0.170.0000.00816.95
8.0.160.0000.00717.18
8.0.150.0070.00016.88
8.0.140.0070.00016.96
8.0.130.0030.00313.50
8.0.120.0000.00817.09
8.0.110.0000.00817.14
8.0.100.0040.00417.17
8.0.90.0040.00417.17
8.0.80.0060.00917.06
8.0.70.0050.00317.05
8.0.60.0070.00017.13
8.0.50.0070.00017.17
8.0.30.0090.00917.34
8.0.20.0080.01117.40
8.0.10.0000.00717.14
8.0.00.0070.01317.00
7.4.330.0000.00516.78
7.4.320.0020.00516.71
7.4.300.0030.00516.73
7.4.290.0030.00316.80
7.4.280.0060.00316.62
7.4.270.0040.00216.80
7.4.260.0030.00316.64
7.4.250.0040.00416.70
7.4.240.0080.00016.81
7.4.230.0080.00016.70
7.4.220.0170.01716.82
7.4.210.0100.00716.68
7.4.200.0040.00416.57
7.4.160.0110.00816.62
7.4.150.0150.00417.40
7.4.140.0110.00717.86
7.4.130.0100.01016.78
7.4.120.0070.01116.73
7.4.110.0150.00416.84
7.4.100.0100.00716.81
7.4.90.0070.01516.71
7.4.80.0100.01019.39
7.4.70.0130.00316.57
7.4.60.0030.01416.51
7.4.50.0030.01016.53
7.4.40.0200.00316.65
7.4.30.0110.00616.59
7.4.00.0090.00715.24
7.3.330.0030.00313.57
7.3.320.0070.00013.44
7.3.310.0050.00216.48
7.3.300.0000.00716.63
7.3.290.0050.01016.60
7.3.280.0070.01116.57
7.3.270.0090.01517.40
7.3.260.0140.00316.60
7.3.250.0080.01016.71
7.3.240.0130.00316.54
7.3.230.0110.00616.59
7.3.210.0090.00916.63
7.3.200.0030.01419.39
7.3.190.0030.01316.59
7.3.180.0130.00316.45
7.3.170.0030.01316.70
7.3.160.0100.01016.55
7.3.120.0100.00815.04
7.3.110.0080.00815.20
7.3.100.0040.01015.18
7.3.90.0070.00914.85
7.3.80.0040.00914.97
7.3.70.0110.00314.96
7.3.60.0050.00814.83
7.3.50.0040.00914.79
7.3.40.0120.00214.88
7.3.30.0080.00614.98
7.3.20.0010.01116.97
7.3.10.0090.00816.65
7.3.00.0100.00516.71
7.2.330.0100.00716.85
7.2.320.0100.00716.84
7.2.310.0070.01116.76
7.2.300.0140.00416.92
7.2.290.0110.00616.83
7.2.250.0080.01015.30
7.2.240.0100.01015.39
7.2.230.0120.00515.30
7.2.220.0080.00515.14
7.2.210.0100.00515.09
7.2.200.0060.00815.01
7.2.190.0010.01215.37
7.2.180.0070.00515.27
7.2.170.0070.00715.18
7.2.130.0230.00717.00
7.2.120.0170.01016.96
7.2.110.0220.00517.20
7.2.100.0210.00716.67
7.2.90.0220.01017.14
7.2.80.0120.01316.75
7.2.70.0120.00816.63
7.2.60.0080.00816.88
7.2.50.0150.00717.21
7.2.40.0250.00616.87
7.2.30.0130.01116.74
7.2.20.0150.00417.11
7.2.10.0220.00816.96
7.2.00.0170.00317.13
7.1.330.0060.00815.88
7.1.320.0060.00515.96
7.1.310.0080.00515.98
7.1.300.0080.00615.91
7.1.290.0070.00815.83
7.1.280.0020.01015.71
7.1.270.0000.01215.88
7.1.260.0070.00715.92
7.1.250.0120.00615.59
7.1.200.0040.00716.13
7.1.70.0050.00317.46
7.1.60.0120.00619.18
7.1.50.0000.01717.29
7.1.00.0100.07022.32
7.0.200.0030.00516.82
7.0.90.0500.05719.99
7.0.80.0570.07720.05
7.0.70.0700.07019.89
7.0.60.0600.07320.00
7.0.50.0570.08020.26
7.0.40.0030.05020.14
7.0.30.0030.05020.09
7.0.20.0030.05020.13
7.0.10.0100.08020.05
7.0.00.0100.07720.13
5.6.280.0000.03321.07
5.6.240.0030.08320.58
5.6.230.0030.06020.64
5.6.220.0170.07020.65
5.6.210.0170.07020.48
5.6.200.0030.09021.02
5.6.190.0230.05721.07
5.6.180.0030.04321.05
5.6.170.0000.06721.04
5.6.160.0070.06020.95
5.6.150.0030.07321.14
5.6.140.0100.05720.96
5.6.130.0100.08321.05
5.6.120.0130.07721.14
5.6.110.0030.07721.08
5.6.100.0130.07021.03
5.6.90.0000.08021.13
5.6.80.0170.07720.44
5.6.70.0030.07720.45
5.6.60.0070.08720.34
5.6.50.0130.06720.48
5.6.40.0070.07320.30
5.6.30.0070.07020.36
5.6.20.0130.07720.49
5.6.10.0070.06320.29
5.6.00.0130.04320.35
5.5.380.0130.05320.55
5.5.370.0100.08020.55
5.5.360.0100.05320.39
5.5.350.0130.06720.43
5.5.340.0070.05720.78
5.5.330.0070.05020.87
5.5.320.0130.07020.65
5.5.310.0070.05320.80
5.5.300.0000.08320.79
5.5.290.0070.06720.87
5.5.280.0170.04320.76
5.5.270.0170.08020.88
5.5.260.0070.08020.73
5.5.250.0070.06720.64
5.5.240.0100.08020.29
5.5.230.0100.07320.02
5.5.220.0100.08020.31
5.5.210.0030.05320.30
5.5.200.0130.07020.22
5.5.190.0000.06319.96
5.5.180.0070.04320.28
5.5.160.0100.07020.24
5.5.150.0100.07020.12
5.5.140.0100.07020.17
5.5.130.0030.05020.07
5.5.120.0200.07020.13
5.5.110.0100.07720.18
5.5.100.0100.07720.14
5.5.90.0030.05320.04
5.5.80.0070.06019.98
5.5.70.0130.07320.09
5.5.60.0130.04020.06
5.5.50.0170.06720.09
5.5.40.0100.07020.06
5.5.30.0130.06320.11
5.5.20.0030.08020.15
5.5.10.0030.05720.11
5.5.00.0000.04319.98

preferences:
52.51 ms | 401 KiB | 5 Q