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']); //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)
8.3.60.0110.00317.00
8.3.50.0070.01116.46
8.3.40.0090.00918.94
8.3.30.0040.01118.92
8.3.20.0070.00020.18
8.3.10.0080.00021.91
8.3.00.0060.00323.70
8.2.180.0080.00818.50
8.2.170.0070.00722.96
8.2.160.0070.00720.21
8.2.150.0030.00624.18
8.2.140.0050.00324.66
8.2.130.0040.00419.96
8.2.120.0050.00226.35
8.2.110.0090.00020.94
8.2.100.0040.00817.93
8.2.90.0000.00819.25
8.2.80.0040.00417.97
8.2.70.0040.00417.88
8.2.60.0040.00418.04
8.2.50.0060.00318.07
8.2.40.0040.00420.64
8.2.30.0000.00719.52
8.2.20.0040.00417.96
8.2.10.0030.00618.21
8.2.00.0000.00718.20
8.1.280.0110.00425.92
8.1.270.0040.01123.97
8.1.260.0040.00428.09
8.1.250.0000.00828.09
8.1.240.0060.01022.54
8.1.230.0080.00319.12
8.1.220.0050.00317.79
8.1.210.0050.00318.77
8.1.200.0030.00617.35
8.1.190.0040.00417.35
8.1.180.0040.00418.10
8.1.170.0030.00618.70
8.1.160.0040.00420.80
8.1.150.0050.00218.79
8.1.140.0050.00319.61
8.1.130.0040.00417.73
8.1.120.0000.00717.55
8.1.110.0000.00817.48
8.1.100.0020.00517.54
8.1.90.0000.00717.62
8.1.80.0070.00017.50
8.1.70.0040.00417.67
8.1.60.0030.00517.70
8.1.50.0090.00017.63
8.1.40.0040.00417.66
8.1.30.0090.00017.75
8.1.20.0030.00617.76
8.1.10.0030.00617.63
8.1.00.0040.00417.52
8.0.300.0070.00018.77
8.0.290.0000.00816.88
8.0.280.0040.00418.52
8.0.270.0070.00017.28
8.0.260.0000.00617.32
8.0.250.0000.00717.14
8.0.240.0040.00417.10
8.0.230.0070.00017.08
8.0.220.0050.00216.92
8.0.210.0000.00717.00
8.0.200.0040.00417.08
8.0.190.0040.00416.99
8.0.180.0030.00717.08
8.0.170.0000.00916.95
8.0.160.0070.00017.13
8.0.150.0040.00417.04
8.0.140.0000.00716.98
8.0.130.0050.00013.51
8.0.120.0040.00417.02
8.0.110.0000.00716.98
8.0.100.0000.00817.02
8.0.90.0000.00716.83
8.0.80.0000.01717.04
8.0.70.0040.00416.91
8.0.60.0000.00816.88
8.0.50.0040.00416.99
8.0.30.0110.00817.33
8.0.20.0080.01117.40
8.0.10.0040.00417.16
8.0.00.0160.00716.84
7.4.330.0000.00516.80
7.4.320.0070.00016.71
7.4.300.0030.00316.64
7.4.290.0030.00316.73
7.4.280.0030.00616.82
7.4.270.0030.00316.82
7.4.260.0000.00716.70
7.4.250.0030.00616.80
7.4.240.0000.00716.80
7.4.230.0070.00016.71
7.4.220.0130.00616.67
7.4.210.0110.01016.75
7.4.200.0000.00716.69
7.4.160.0180.00016.75
7.4.150.0060.01217.40
7.4.140.0080.01017.86
7.4.130.0060.01416.81
7.4.120.0060.01416.77
7.4.110.0070.01416.73
7.4.100.0100.01116.60
7.4.90.0000.02216.88
7.4.80.0120.00819.39
7.4.70.0070.01016.58
7.4.60.0080.00816.78
7.4.50.0070.00416.72
7.4.40.0060.01516.82
7.4.30.0040.01816.79
7.4.10.0070.01215.25
7.4.00.0080.01115.09
7.3.330.0000.00513.52
7.3.320.0000.00713.52
7.3.310.0030.00516.42
7.3.300.0030.00316.41
7.3.290.0090.00716.47
7.3.280.0090.00916.51
7.3.270.0090.00917.40
7.3.260.0100.00716.77
7.3.250.0120.00716.58
7.3.240.0080.00816.63
7.3.230.0060.01116.64
7.3.210.0120.00916.59
7.3.200.0090.00919.39
7.3.190.0120.00616.75
7.3.180.0100.00616.62
7.3.170.0100.00716.73
7.3.160.0090.01216.71
7.3.130.0070.01015.06
7.3.120.0110.00714.97
7.3.110.0110.00714.98
7.3.100.0100.00415.00
7.3.90.0090.00715.09
7.3.80.0060.00815.10
7.3.70.0020.01415.00
7.3.60.0020.01015.10
7.3.50.0020.01415.17
7.3.40.0000.01315.13
7.3.30.0050.00715.02
7.3.20.0070.00416.81
7.3.10.0110.00516.68
7.3.00.0100.00816.92
7.2.330.0090.01216.75
7.2.320.0100.00716.78
7.2.310.0030.01616.97
7.2.300.0130.00917.00
7.2.290.0140.00316.93
7.2.260.0060.01315.34
7.2.250.0110.00615.16
7.2.240.0030.01115.25
7.2.230.0080.00915.39
7.2.220.0060.00815.17
7.2.210.0090.00615.04
7.2.200.0050.01315.15
7.2.190.0090.00615.23
7.2.180.0040.00815.25
7.2.170.0060.01015.26
7.2.160.0070.00715.17
7.2.150.0070.00517.21
7.2.140.0060.00517.18
7.2.130.0080.00716.85
7.2.120.0060.00816.89
7.2.110.0060.01016.91
7.2.100.0080.00916.99
7.2.90.0080.00916.99
7.2.80.0070.01017.04
7.2.70.0130.00516.87
7.2.60.0080.00716.99
7.2.50.0060.01216.97
7.2.40.0100.00816.88
7.2.30.0070.00917.02
7.2.20.0090.00717.10
7.2.10.0090.00716.95
7.2.00.0060.00917.71
7.1.330.0090.00316.02
7.1.320.0060.00815.95
7.1.310.0080.00515.92
7.1.300.0090.00516.04
7.1.290.0040.00715.85
7.1.280.0070.00515.88
7.1.270.0020.01216.00
7.1.260.0020.01216.17
7.1.250.0080.00615.79
7.1.240.0070.00415.95
7.1.230.0060.00615.90
7.1.220.0050.00715.87
7.1.210.0070.00715.82
7.1.200.0080.00415.89
7.1.190.0090.00716.10
7.1.180.0030.00816.02
7.1.170.0040.00716.18
7.1.160.0030.01016.01
7.1.150.0050.00915.93
7.1.140.0040.00915.76
7.1.130.0080.00415.89
7.1.120.0030.01015.85
7.1.110.0020.01116.09
7.1.100.0060.00916.86
7.1.90.0080.00816.01
7.1.80.0060.00516.01
7.1.70.0020.01016.49
7.1.60.0070.00517.04
7.1.50.0050.00616.44
7.1.40.0070.00616.06
7.1.30.0030.00915.99
7.1.20.0030.01015.99
7.1.10.0080.00916.06
7.1.00.0050.03018.21
7.0.330.0060.00515.72
7.0.320.0010.01315.52
7.0.310.0030.01015.51
7.0.300.0070.00715.69
7.0.290.0040.00915.66
7.0.280.0040.01115.59
7.0.270.0100.00315.58
7.0.260.0070.00715.68
7.0.250.0030.01115.54
7.0.240.0070.00815.54
7.0.230.0060.00715.70
7.0.220.0050.00715.49
7.0.210.0060.00815.53
7.0.200.0060.00416.03
7.0.190.0050.00715.64
7.0.180.0050.00815.61
7.0.170.0050.00815.71
7.0.160.0060.00915.57
7.0.150.0060.00915.50
7.0.140.0030.00915.60
7.0.130.0020.01215.43
7.0.120.0080.00815.55
7.0.110.0080.00715.63
7.0.100.0050.00915.67
7.0.90.0070.02117.09
7.0.80.0050.03117.01
7.0.70.0040.03516.98
7.0.60.0060.03017.06
7.0.50.0110.01917.19
7.0.40.0060.03215.91
7.0.30.0050.02215.84
7.0.20.0050.02015.79
7.0.10.0070.02915.76
7.0.00.0080.02315.74
5.6.400.0040.00914.28
5.6.390.0030.00714.58
5.6.380.0050.00914.42
5.6.370.0070.00714.70
5.6.360.0060.00814.71
5.6.350.0040.00614.45
5.6.340.0040.00714.25
5.6.330.0030.01014.57
5.6.320.0050.00914.61
5.6.310.0010.01114.68
5.6.300.0030.01214.50
5.6.290.0080.00514.23
5.6.280.0050.01516.71
5.6.270.0070.00714.25
5.6.260.0080.00414.35
5.6.250.0020.00914.54
5.6.240.0090.02716.58
5.6.230.0080.03116.51
5.6.220.0010.03316.67
5.6.210.0080.01816.61
5.6.200.0060.03516.78
5.6.190.0080.03116.74
5.6.180.0110.02816.62
5.6.170.0090.03416.79
5.6.160.0050.02316.72
5.6.150.0060.03416.72
5.6.140.0130.02316.62
5.6.130.0080.03416.75
5.6.120.0090.02316.72
5.6.110.0030.03316.61
5.6.100.0060.03216.58
5.6.90.0060.03116.53
5.6.80.0090.02016.53
5.6.70.0040.03416.29
5.6.60.0060.03316.39
5.6.50.0050.03416.40
5.6.40.0070.03316.48
5.6.30.0040.03316.47
5.6.20.0050.02416.43
5.6.10.0030.02916.39
5.6.00.0070.02616.45
5.5.380.0090.02916.37
5.5.370.0080.03016.28
5.5.360.0090.01916.50
5.5.350.0090.03016.39
5.5.340.0080.03016.50
5.5.330.0080.02816.74
5.5.320.0080.03316.46
5.5.310.0060.02416.49
5.5.300.0040.02616.57
5.5.290.0080.03216.60
5.5.280.0070.03516.62
5.5.270.0060.03016.62
5.5.260.0080.02916.47
5.5.250.0090.02516.46
5.5.240.0040.03516.46
5.5.230.0110.02916.31
5.5.220.0070.03116.34
5.5.210.0100.03216.19
5.5.200.0050.02916.14
5.5.190.0070.03016.32
5.5.180.0100.02816.47
5.5.170.0070.00914.42
5.5.160.0110.03016.25
5.5.150.0050.02116.23
5.5.140.0060.01816.24
5.5.130.0080.03216.13
5.5.120.0030.02516.30
5.5.110.0120.02816.28
5.5.100.0050.03116.15
5.5.90.0030.02316.35
5.5.80.0060.02016.33
5.5.70.0070.03216.22
5.5.60.0080.02716.29
5.5.50.0090.02816.27
5.5.40.0040.02716.29
5.5.30.0070.03116.26
5.5.20.0030.02216.20
5.5.10.0090.03016.39
5.5.00.0100.01416.16

preferences:
59.49 ms | 400 KiB | 5 Q