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)
8.3.60.0060.00916.88
8.3.50.0090.00618.20
8.3.40.0160.00319.09
8.3.30.0150.00418.88
8.3.20.0150.00020.30
8.3.10.0050.00321.89
8.3.00.0040.00423.54
8.2.180.0230.00316.75
8.2.170.0140.00022.96
8.2.160.0130.00020.45
8.2.150.0000.00824.18
8.2.140.0050.00324.66
8.2.130.0070.00026.16
8.2.120.0040.00421.15
8.2.110.0030.00619.32
8.2.100.0060.00617.87
8.2.90.0060.00319.28
8.2.80.0090.00017.97
8.2.70.0000.00817.62
8.2.60.0040.00418.04
8.2.50.0040.00418.10
8.2.40.0040.00422.32
8.2.30.0050.00219.64
8.2.20.0040.00417.90
8.2.10.0040.00418.25
8.2.00.0000.00818.14
8.1.280.0170.00325.92
8.1.270.0060.00324.66
8.1.260.0050.00326.35
8.1.250.0080.00028.09
8.1.240.0040.00422.08
8.1.230.0110.00017.76
8.1.220.0000.00817.79
8.1.210.0000.00918.77
8.1.200.0000.00817.50
8.1.190.0030.00517.38
8.1.180.0040.00418.10
8.1.170.0030.00618.75
8.1.160.0000.00720.76
8.1.150.0050.00219.03
8.1.140.0040.00419.61
8.1.130.0000.00717.65
8.1.120.0040.00417.63
8.1.110.0040.00417.57
8.1.100.0000.00817.61
8.1.90.0000.00717.58
8.1.80.0060.00317.64
8.1.70.0000.00817.49
8.1.60.0030.00517.74
8.1.50.0040.00417.69
8.1.40.0040.00417.68
8.1.30.0000.00917.79
8.1.20.0070.00017.70
8.1.10.0050.00217.63
8.1.00.0040.00417.55
8.0.300.0040.00418.77
8.0.290.0000.00716.75
8.0.280.0000.00718.52
8.0.270.0030.00417.20
8.0.260.0060.00017.26
8.0.250.0070.00017.00
8.0.240.0000.00716.97
8.0.230.0000.00717.09
8.0.220.0040.00417.07
8.0.210.0000.00717.10
8.0.200.0060.00317.11
8.0.190.0000.00817.13
8.0.180.0060.00316.97
8.0.170.0050.00317.08
8.0.160.0050.00317.07
8.0.150.0020.00517.02
8.0.140.0040.00416.99
8.0.130.0030.00313.53
8.0.120.0030.00517.07
8.0.110.0040.00417.06
8.0.100.0050.00216.84
8.0.90.0000.00816.95
8.0.80.0120.00417.00
8.0.70.0040.00417.04
8.0.60.0000.00717.00
8.0.50.0040.00417.05
8.0.30.0120.00717.47
8.0.20.0120.00917.40
8.0.10.0040.00417.15
8.0.00.0090.01217.00
7.4.330.0020.00216.67
7.4.320.0030.00316.62
7.4.300.0030.00516.77
7.4.290.0070.00016.81
7.4.280.0060.00316.75
7.4.270.0050.00216.80
7.4.260.0030.00316.83
7.4.250.0000.00716.64
7.4.240.0050.00216.83
7.4.230.0040.00416.79
7.4.220.0040.01516.77
7.4.210.0030.01416.86
7.4.200.0050.00216.82
7.4.160.0070.01316.57
7.4.150.0210.00017.40
7.4.140.0100.00917.86
7.4.130.0090.00916.87
7.4.120.0140.00816.93
7.4.110.0060.01116.69
7.4.100.0060.01216.70
7.4.90.0110.00716.57
7.4.80.0120.00919.39
7.4.70.0170.00016.65
7.4.60.0100.01016.82
7.4.50.0110.00716.58
7.4.40.0070.01716.70
7.4.30.0160.00616.69
7.4.10.0070.01315.12
7.4.00.0070.00915.28
7.3.330.0030.00313.49
7.3.320.0030.00313.55
7.3.310.0030.00516.37
7.3.300.0000.00716.40
7.3.290.0080.00816.54
7.3.280.0060.01316.52
7.3.270.0060.01217.40
7.3.260.0040.01716.71
7.3.240.0060.01216.55
7.3.230.0070.01116.73
7.3.210.0120.00616.48
7.3.200.0190.00019.39
7.3.190.0090.00616.61
7.3.180.0040.01216.63
7.3.170.0160.00616.70
7.3.160.0090.01216.46
7.3.130.0070.01115.17
7.3.120.0090.00915.05
7.3.110.0160.00315.22
7.3.100.0070.00714.91
7.3.90.0110.00715.07
7.3.80.0060.00614.99
7.3.70.0140.00014.99
7.3.60.0030.00714.78
7.3.50.0050.00314.69
7.3.40.0070.01015.19
7.3.30.0030.01015.14
7.3.20.0060.00316.68
7.3.10.0070.00716.93
7.3.00.0070.00716.77
7.2.330.0110.00617.01
7.2.320.0070.01016.79
7.2.310.0130.00616.98
7.2.300.0050.01416.84
7.2.290.0140.00616.74
7.2.260.0070.01315.22
7.2.250.0110.00415.43
7.2.240.0040.01115.34
7.2.230.0100.00715.00
7.2.220.0060.00615.36
7.2.210.0040.00815.24
7.2.200.0060.00615.30
7.2.190.0030.00915.30
7.2.180.0040.00415.36
7.2.170.0000.01015.16
7.2.160.0000.00914.85
7.2.150.0060.00617.11
7.2.140.0060.00917.21
7.2.130.0060.00817.23
7.2.120.0030.01017.12
7.2.110.0060.01016.95
7.2.100.0120.00417.19
7.2.90.0040.01217.36
7.2.80.0100.00617.35
7.2.70.0040.01417.16
7.2.60.0170.01017.01
7.2.50.0060.00316.94
7.2.40.0100.01016.90
7.2.30.0090.00917.05
7.2.20.0090.00316.88
7.2.10.0070.01117.23
7.2.00.0100.00717.02
7.1.330.0070.00716.19
7.1.320.0030.01416.02
7.1.310.0100.00315.78
7.1.300.0050.00516.13
7.1.290.0030.00916.03
7.1.280.0070.00716.12
7.1.270.0070.00715.64
7.1.260.0090.00616.02
7.1.250.0030.01316.05
7.1.240.0130.00015.98
7.1.230.0100.00316.08
7.1.220.0070.00716.02
7.1.210.0060.01016.00
7.1.200.0040.00915.88
7.1.190.0030.00916.17
7.1.180.0000.01515.70
7.1.170.0090.00616.00
7.1.160.0120.00316.03
7.1.150.0030.01515.74
7.1.140.0120.00415.92
7.1.130.0060.00316.04
7.1.120.0040.01116.11
7.1.110.0080.00416.18
7.1.100.0060.00615.98
7.1.90.0030.01016.18
7.1.80.0060.00915.84
7.1.70.0050.01016.64
7.1.60.0050.00716.72
7.1.50.0060.01316.61
7.1.40.0060.00616.06
7.1.30.0070.00716.05
7.1.20.0090.00615.71
7.1.10.0070.00316.05
7.1.00.0060.04019.12
7.0.330.0070.00715.67
7.0.320.0000.01415.69
7.0.310.0140.00015.56
7.0.300.0060.00715.68
7.0.290.0090.00915.39
7.0.280.0000.01215.18
7.0.270.0130.00315.61
7.0.260.0040.01215.60
7.0.250.0060.00615.70
7.0.240.0100.00315.39
7.0.230.0070.00715.48
7.0.220.0030.01015.50
7.0.210.0040.01115.66
7.0.200.0050.00616.29
7.0.190.0100.00015.69
7.0.180.0000.01215.70
7.0.170.0100.00715.55
7.0.160.0030.00615.75
7.0.150.0100.00315.75
7.0.140.0040.00815.73
7.0.130.0040.00415.67
7.0.120.0000.01415.74
7.0.110.0030.00615.62
7.0.100.0070.01115.35
7.0.90.0330.04117.69
7.0.80.0220.02917.73
7.0.70.0370.03717.83
7.0.60.0220.03217.82
7.0.50.0300.04317.95
7.0.40.0080.04116.84
7.0.30.0090.03616.95
7.0.20.0050.04916.89
7.0.10.0080.04016.98
7.0.00.0070.04716.87
5.6.400.0100.00014.64
5.6.390.0070.00714.68
5.6.380.0060.00614.64
5.6.370.0030.01314.28
5.6.360.0090.00614.51
5.6.350.0070.00714.33
5.6.340.0080.00414.64
5.6.330.0060.00914.64
5.6.320.0030.00614.48
5.6.310.0030.01014.59
5.6.300.0030.01114.47
5.6.290.0090.00614.62
5.6.280.0030.01817.71
5.6.270.0030.00714.55
5.6.260.0140.00314.59
5.6.250.0030.01314.32
5.6.240.0030.03017.62
5.6.230.0070.03917.58
5.6.220.0050.02817.54
5.6.210.0050.04517.73
5.6.200.0110.03817.79
5.6.190.0100.03617.80
5.6.180.0080.02617.69
5.6.170.0100.04217.68
5.6.160.0070.03617.74
5.6.150.0080.03817.92
5.6.140.0060.04417.84
5.6.130.0090.02817.78
5.6.120.0050.04717.68
5.6.110.0130.04317.83
5.6.100.0050.04717.94
5.6.90.0030.04017.69
5.6.80.0100.04017.47
5.6.70.0040.03317.35
5.6.60.0050.04517.38
5.6.50.0130.03817.44
5.6.40.0080.04217.57
5.6.30.0070.04517.49
5.6.20.0100.04217.57
5.6.10.0080.04517.42
5.6.00.0050.04517.57
5.5.380.0100.03717.57
5.5.370.0030.03317.49
5.5.360.0030.03917.54
5.5.350.0110.03617.55
5.5.340.0020.02717.64
5.5.330.0070.02517.66
5.5.320.0100.02317.54
5.5.310.0080.04517.63
5.5.300.0050.04217.77
5.5.290.0050.03717.52
5.5.280.0030.04417.76
5.5.270.0110.02317.78
5.5.260.0050.04517.74
5.5.250.0040.04417.57
5.5.240.0130.03517.43
5.5.230.0090.04217.24
5.5.220.0050.04617.21
5.5.210.0130.03717.35
5.5.200.0030.03617.30
5.5.190.0030.04217.18
5.5.180.0080.04017.27
5.5.170.0070.00714.16
5.5.160.0050.04817.50
5.5.150.0070.04217.22
5.5.140.0110.03817.31
5.5.130.0050.03217.37
5.5.120.0110.03317.34
5.5.110.0050.04417.15
5.5.100.0070.04317.24
5.5.90.0130.02517.28
5.5.80.0020.03017.33
5.5.70.0060.04317.26
5.5.60.0110.03817.23
5.5.50.0090.04217.17
5.5.40.0030.03017.23
5.5.30.0080.04217.14
5.5.20.0020.04817.31
5.5.10.0130.03817.20
5.5.00.0030.03717.38

preferences:
65.53 ms | 400 KiB | 5 Q