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 $m[0]; } function func(&$data) { foreach ($data as $key => $value) { if (is_array($value)) { func($data[$key]); } } } $data = [ ['k' => [0]], ['k' => [1]], ]; echo get_refcount($data[1]['k'])."\n"; //refcount(2) func($data); echo get_refcount($data[1]['k'])."\n"; //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)
8.3.60.0140.00016.88
8.3.50.0150.00321.40
8.3.40.0000.01518.83
8.3.30.0110.00719.04
8.3.20.0080.00820.34
8.3.10.0040.00421.64
8.3.00.0040.00423.61
8.2.180.0120.00616.88
8.2.170.0110.00422.96
8.2.160.0070.00720.53
8.2.150.0000.01024.18
8.2.140.0080.00024.66
8.2.130.0080.00019.95
8.2.120.0070.00026.35
8.2.110.0060.00321.04
8.2.100.0060.00618.03
8.2.90.0050.00319.41
8.2.80.0000.00818.05
8.2.70.0000.00917.63
8.2.60.0000.00817.93
8.2.50.0070.00418.07
8.2.40.0040.00422.37
8.2.30.0000.00719.61
8.2.20.0040.00417.93
8.2.10.0050.00518.06
8.2.00.0000.00818.20
8.1.280.0070.01125.92
8.1.270.0140.00023.97
8.1.260.0040.00428.09
8.1.250.0050.00228.09
8.1.240.0100.00022.42
8.1.230.0110.00019.17
8.1.220.0030.00517.78
8.1.210.0080.00018.77
8.1.200.0030.00617.48
8.1.190.0030.00517.35
8.1.180.0040.00418.10
8.1.170.0040.00418.81
8.1.160.0040.00420.79
8.1.150.0040.00418.83
8.1.140.0040.00419.61
8.1.130.0040.00417.66
8.1.120.0040.00417.47
8.1.110.0000.00817.64
8.1.100.0030.00517.63
8.1.90.0030.00517.69
8.1.80.0080.00017.55
8.1.70.0000.00717.52
8.1.60.0050.00217.61
8.1.50.0030.00617.56
8.1.40.0050.00317.68
8.1.30.0000.00817.84
8.1.20.0000.00817.80
8.1.10.0040.00417.65
8.1.00.0080.00017.68
8.0.300.0040.00418.77
8.0.290.0040.00416.75
8.0.280.0030.00318.44
8.0.270.0030.00317.33
8.0.260.0040.00417.29
8.0.250.0000.00717.01
8.0.240.0000.00717.00
8.0.230.0000.00717.14
8.0.220.0000.00717.04
8.0.210.0030.00317.07
8.0.200.0050.00317.05
8.0.190.0000.00717.11
8.0.180.0000.01017.05
8.0.170.0040.00417.13
8.0.160.0040.00417.12
8.0.150.0050.00316.88
8.0.140.0040.00417.00
8.0.130.0030.00313.48
8.0.120.0030.00517.02
8.0.110.0050.00217.05
8.0.100.0040.00417.06
8.0.90.0000.00816.95
8.0.80.0060.01016.99
8.0.70.0000.00716.91
8.0.60.0070.00016.84
8.0.50.0080.00017.11
8.0.30.0090.00917.02
8.0.20.0100.01217.40
8.0.10.0070.00017.18
8.0.00.0040.01716.90
7.4.330.0030.00316.72
7.4.320.0030.00316.70
7.4.300.0040.00416.73
7.4.290.0000.00816.72
7.4.280.0030.00616.77
7.4.270.0030.00316.63
7.4.260.0000.00716.78
7.4.250.0040.00416.75
7.4.240.0070.00016.86
7.4.230.0030.00316.64
7.4.220.0120.00616.91
7.4.210.0130.00616.84
7.4.200.0030.00316.62
7.4.160.0070.01016.80
7.4.150.0090.00917.40
7.4.140.0050.01317.86
7.4.130.0100.01016.58
7.4.120.0070.01016.75
7.4.110.0030.01416.79
7.4.100.0140.00716.66
7.4.90.0090.01216.77
7.4.80.0040.01519.39
7.4.70.0150.00316.76
7.4.60.0070.01316.48
7.4.50.0070.00616.64
7.4.40.0080.01216.59
7.4.30.0080.01016.59
7.4.00.0040.01114.79
7.3.330.0020.00213.52
7.3.320.0000.00613.46
7.3.310.0030.00516.33
7.3.300.0000.00716.52
7.3.290.0060.01016.54
7.3.280.0090.01016.50
7.3.270.0110.00717.40
7.3.260.0060.01316.74
7.3.240.0120.00816.64
7.3.230.0110.00616.65
7.3.210.0070.01016.54
7.3.200.0070.01019.39
7.3.190.0100.00716.60
7.3.180.0080.01316.76
7.3.170.0060.01516.71
7.3.160.0190.00416.60
7.2.330.0140.00316.96
7.2.320.0060.01116.68
7.2.310.0100.00716.85
7.2.300.0040.01616.81
7.2.290.0120.00616.76
7.2.80.0110.00416.96
7.2.60.0090.00617.04
7.2.00.0030.01019.41
7.1.200.0030.01016.02
7.1.100.0080.00318.55
7.1.70.0030.00617.55
7.1.60.0110.01119.18
7.1.50.0070.00317.18
7.1.00.0000.07722.37
7.0.200.0000.00916.72
7.0.90.0100.06019.93
7.0.80.0070.04019.99
7.0.70.0200.05319.98
7.0.60.0130.04319.96
7.0.50.0030.04020.31
7.0.40.0070.04020.19
7.0.30.0000.04720.10
7.0.20.0170.04319.92
7.0.10.0000.07020.12
7.0.00.0100.08720.04
5.6.280.0030.03320.87
5.6.240.0030.04020.73
5.6.230.0070.04020.66
5.6.220.0100.04720.67
5.6.210.0000.04720.66
5.6.200.0100.04021.18
5.6.190.0070.03321.02
5.6.180.0070.06720.99
5.6.170.0070.04021.09
5.6.160.0170.08021.14
5.6.150.0130.04020.97
5.6.140.0100.07321.06
5.6.130.0030.06321.02
5.6.120.0170.07320.94
5.6.110.0100.06320.99
5.6.100.0170.06321.00
5.6.90.0130.07021.09
5.6.80.0070.08320.32
5.6.70.0070.08020.51
5.6.60.0130.04020.46
5.6.50.0030.04720.41
5.6.40.0130.07320.44
5.6.30.0070.07320.30
5.6.20.0070.07020.47
5.6.10.0070.08320.36
5.6.00.0070.05320.30
5.5.380.0070.03720.40
5.5.370.0100.03020.36
5.5.360.0100.03720.33
5.5.350.0030.04720.46
5.5.340.0030.04720.78
5.5.330.0100.06020.79
5.5.320.0070.04020.88
5.5.310.0000.03720.83
5.5.300.0070.05020.76
5.5.290.0100.08720.90
5.5.280.0000.07720.89
5.5.270.0100.04720.83
5.5.260.0070.08320.77
5.5.250.0200.06720.55
5.5.240.0130.05320.28
5.5.230.0030.05320.02
5.5.220.0070.04320.29
5.5.210.0070.07720.28
5.5.200.0070.04020.29
5.5.190.0000.05720.27
5.5.180.0130.07020.24
5.5.160.0030.05320.13
5.5.150.0130.07320.08
5.5.140.0130.05020.08
5.5.130.0030.08020.13
5.5.120.0070.07720.27
5.5.110.0030.06320.27
5.5.100.0170.07320.09
5.5.90.0130.07020.16
5.5.80.0000.08320.12
5.5.70.0030.08020.07
5.5.60.0070.08720.07
5.5.50.0170.04020.07
5.5.40.0200.06320.06
5.5.30.0130.06720.16
5.5.20.0100.07320.16
5.5.10.0070.06720.11
5.5.00.0070.06320.02

preferences:
47.3 ms | 401 KiB | 5 Q