3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1, 2]; $b = $a; $a[] = 3; $b[] = 4; echo "When next index=2 and max key=2, next key is both 2.\n"; var_dump($a, $b); // $a = [0=>1, 1=>2, 2=>3] $b = [0=>1, 1=>2, 2=>4] $a = [1, 2]; unset($a[1]); $b = $a; $a[] = 3; $b[] = 4; echo "\nWhen next index=2 and max key=1, next key is both 2. \n"; var_dump($a, $b); // $a = [0=>1, 2=>3] $b = [0=>1, 2=>4] $a = [1, 2]; unset($a[1], $a[0]); $b = $a; $a[] = 3; $b[] = 4; echo "\nWhen next index=2 and max key=0, next key is 0 or 2."; var_dump($a, $b); // $a = [0=>3] $b = [2=>4] what? $a = [1, 2]; unset($a[1], $a[0]); $b = $a; $b[] = 4; $a[] = 3; echo "\nIf reverse variable, result is reverse too.\n"; var_dump($a, $b); // $a = [2=>3] $b = [0=>4] what?? $a = [1, 2]; unset($a[1], $a[0]); $b = $c = $d = $a; $a[] = 3; $b[] = 4; $d[] = 6; $c[] = 5; echo "\nWhen increase variables, only the last one take over key..\n"; var_dump($a, $b, $c, $d); // $c's key is 2, others are 0

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)
8.3.60.0130.00618.18
8.3.50.0140.00017.98
8.3.40.0090.01220.23
8.3.30.0150.00618.85
8.3.20.0030.00520.84
8.3.10.0040.00420.33
8.3.00.0080.00022.51
8.2.180.0120.00325.92
8.2.170.0110.00722.96
8.2.160.0070.00721.21
8.2.150.0040.00424.18
8.2.140.0070.00024.66
8.2.130.0080.00026.16
8.2.120.0060.00319.83
8.2.110.0090.00022.14
8.2.100.0040.00717.78
8.2.90.0040.00417.97
8.2.80.0080.00019.11
8.2.70.0030.00617.89
8.2.60.0040.00418.16
8.2.50.0030.00619.30
8.2.40.0080.00021.07
8.2.30.0000.00719.21
8.2.20.0040.00418.10
8.2.10.0000.00719.27
8.2.00.0000.00719.21
8.1.280.0030.01225.92
8.1.270.0080.00820.61
8.1.260.0040.00426.35
8.1.250.0080.00028.09
8.1.240.0040.00423.92
8.1.230.0000.01122.75
8.1.220.0000.00817.74
8.1.210.0000.00818.77
8.1.200.0060.00317.36
8.1.190.0050.00517.23
8.1.180.0060.00319.08
8.1.170.0060.00318.59
8.1.160.0040.00418.92
8.1.150.0050.00218.89
8.1.140.0000.00718.84
8.1.130.0040.00417.48
8.1.120.0040.00417.33
8.1.110.0030.00517.42
8.1.100.0000.00717.34
8.1.90.0080.00017.38
8.1.80.0000.00917.42
8.1.70.0030.00317.37
8.1.60.0030.00717.58
8.1.50.0000.00817.50
8.1.40.0040.00417.52
8.1.30.0000.00817.64
8.1.20.0030.00617.51
8.1.10.0030.00517.52
8.1.00.0030.00617.52
8.0.300.0060.00321.66
8.0.290.0030.00516.75
8.0.280.0030.00318.43
8.0.270.0030.00316.88
8.0.260.0000.00616.79
8.0.250.0040.00416.89
8.0.240.0000.00816.80
8.0.230.0040.00416.80
8.0.220.0000.00716.82
8.0.210.0030.00316.79
8.0.200.0040.00416.90
8.0.190.0070.00016.93
8.0.180.0040.00416.86
8.0.170.0040.00416.77
8.0.160.0040.00416.78
8.0.150.0040.00416.69
8.0.140.0060.00316.81
8.0.130.0030.00313.33
8.0.120.0040.00416.79
8.0.110.0040.00416.71
8.0.100.0040.00416.86
8.0.90.0000.00816.84
8.0.80.0060.00916.82
8.0.70.0000.00716.85
8.0.60.0050.00316.90
8.0.50.0000.00816.71
8.0.30.0190.00416.99
8.0.20.0100.00917.08
8.0.10.0030.00716.86
8.0.00.0130.01317.00
7.4.330.0000.00515.55
7.4.320.0000.00616.54
7.4.300.0030.00316.53
7.4.290.0030.00516.63
7.4.280.0050.00216.61
7.4.270.0030.00316.55
7.4.260.0000.00513.34
7.4.250.0020.00516.55
7.4.240.0040.00316.53
7.4.230.0030.00316.44
7.4.220.0070.00016.66
7.4.210.0090.01016.41
7.4.200.0070.00016.63
7.4.130.0080.01116.48
7.4.120.0150.00616.53
7.4.110.0100.01416.52
7.4.100.0150.00416.50
7.4.90.0170.00416.75
7.4.80.0070.01019.39
7.4.70.0130.00316.39
7.4.60.0100.00716.43
7.4.50.0120.00916.45
7.4.40.0100.01016.40
7.4.30.0110.00916.39
7.4.20.0090.01016.40
7.4.10.0090.01116.45
7.4.00.0100.01116.51
7.3.330.0000.00816.49
7.3.320.0050.00013.19
7.3.310.0000.00716.21
7.3.300.0060.00016.19
7.3.290.0080.00916.32
7.3.260.0040.01516.67
7.3.240.0090.01016.41
7.3.230.0100.01016.40
7.3.210.0080.01216.22
7.3.200.0120.00616.36
7.3.190.0070.01016.41
7.3.180.0050.01316.42
7.3.170.0110.00916.39
7.3.160.0100.01016.47
7.3.150.0120.00716.39
7.3.140.0110.00716.36
7.3.130.0080.01116.36
7.3.120.0090.01016.39
7.3.110.0100.00816.38
7.3.100.0110.00816.40
7.3.90.0090.01016.33
7.3.80.0120.00716.41
7.3.70.0110.01016.38
7.3.60.0100.00916.34
7.3.50.0090.01016.35
7.3.40.0110.00816.35
7.3.30.0120.00716.34
7.3.20.0140.00816.49
7.3.10.0120.00916.57
7.3.00.0120.00916.51
7.2.330.0090.01516.62
7.2.320.0110.01416.82
7.2.310.0080.01016.65
7.2.300.0050.01716.51
7.2.290.0100.01016.47
7.2.280.0090.01116.56
7.2.270.0090.01016.61
7.2.260.0090.01116.61
7.2.250.0100.00916.64
7.2.240.0100.01016.52
7.2.230.0110.00816.52
7.2.220.0080.01216.56
7.2.210.0090.01116.54
7.2.200.0100.01116.54
7.2.190.0100.01116.55
7.2.180.0080.01216.48
7.2.170.0090.01116.58
7.2.160.0100.00916.54
7.2.150.0120.01116.72
7.2.140.0100.01016.76
7.2.130.0090.01116.69
7.2.120.0100.01016.74
7.2.110.0100.01016.74
7.2.100.0110.01016.71
7.2.90.0110.01016.75
7.2.80.0110.01016.67
7.2.70.0140.01216.76
7.2.60.0120.01016.67
7.2.50.0120.00916.68
7.2.40.0120.00916.77
7.2.30.0090.01216.73
7.2.20.0110.00916.69
7.2.10.0130.00816.74
7.2.00.0100.01116.72
7.1.330.0210.00715.86
7.1.320.0180.00715.99
7.1.310.0150.01015.97
7.1.300.0190.00515.96
7.1.290.0190.00715.92
7.1.280.0190.01115.95
7.1.270.0240.00815.98
7.1.260.0180.00915.95
7.1.250.0180.01015.98
7.1.240.0120.01115.93
7.1.230.0190.00415.96
7.1.220.0140.01315.74
7.1.210.0140.01215.82
7.1.200.0180.00815.87
7.1.190.0150.00915.89
7.1.180.0170.00815.81
7.1.170.0200.00915.98
7.1.160.0140.00915.82
7.1.150.0160.00715.83
7.1.140.0180.01115.83
7.1.130.0160.00715.83
7.1.120.0150.00915.88
7.1.110.0130.00915.74
7.1.100.0130.01115.93
7.1.90.0150.01015.80
7.1.80.0220.00715.83
7.1.70.0180.00615.85
7.1.60.0160.00815.88
7.1.50.0130.01015.90
7.1.40.0160.00615.86
7.1.30.0130.01015.84
7.1.20.0150.00715.95
7.1.10.0130.00915.99
7.1.00.0160.00915.81
7.0.330.0200.00815.64
7.0.320.0170.00915.57
7.0.310.0300.00715.55
7.0.300.0180.00915.57
7.0.290.0210.01015.69
7.0.280.0170.00915.53
7.0.270.0210.00815.57
7.0.260.0190.00615.61
7.0.250.0150.01015.59
7.0.240.0220.00515.73
7.0.230.0140.00915.56
7.0.220.0150.00915.62
7.0.210.0140.00815.72
7.0.200.0170.00815.55
7.0.190.0160.00915.67
7.0.180.0200.01015.68
7.0.170.0160.00715.67
7.0.160.0190.00715.65
7.0.150.0120.01215.67
7.0.140.0170.00915.71
7.0.130.0200.01115.58
7.0.120.0160.01015.66
7.0.110.0140.01015.51
7.0.100.0170.00915.51
7.0.90.0230.00915.68
7.0.80.0100.01315.63
7.0.70.0130.01215.53
7.0.60.0170.00715.56
7.0.50.0170.01015.59
7.0.40.0170.01015.60
7.0.30.0190.00515.57
7.0.20.0170.00915.57
7.0.10.0180.01215.48
7.0.00.0180.00915.50
5.6.400.0190.01315.88
5.6.390.0170.01215.97
5.6.380.0150.01415.82
5.6.370.0170.01315.87
5.6.360.0160.01315.88
5.6.350.0130.01815.93
5.6.340.0160.01216.02
5.6.330.0190.01015.85
5.6.320.0170.01015.94
5.6.310.0170.01115.85
5.6.300.0180.00915.87
5.6.290.0140.01415.97
5.6.280.0190.00915.96
5.6.270.0170.01315.79
5.6.260.0180.01215.94
5.6.250.0200.00715.91
5.6.240.0180.01215.81
5.6.230.0150.01115.86
5.6.220.0140.01215.87
5.6.210.0190.01015.95
5.6.200.0150.01015.83
5.6.190.0200.00815.85
5.6.180.0170.01215.77
5.6.170.0170.01015.79
5.6.160.0180.00915.85
5.6.150.0180.01015.88
5.6.140.0140.01415.87
5.6.130.0180.01115.86
5.6.120.0200.00915.75
5.6.110.0170.01015.85
5.6.100.0170.01315.93
5.6.90.0190.00815.86
5.6.80.0150.01115.79
5.6.70.0190.00815.87
5.6.60.0170.01015.81
5.6.50.0100.01315.75
5.6.40.0190.01015.82
5.6.30.0140.01415.91
5.6.20.0130.01415.84
5.6.10.0150.01115.81
5.6.00.0150.01115.75
5.5.380.0160.01215.87
5.5.370.0170.01115.84
5.5.360.0130.01315.80
5.5.350.0120.01215.92
5.5.340.0170.01115.85
5.5.330.0140.01315.84
5.5.320.0120.01515.93
5.5.310.0160.01215.87
5.5.300.0180.01115.67
5.5.290.0220.00715.72
5.5.280.0190.01015.75
5.5.270.0180.01015.89
5.5.260.0170.01215.88
5.5.250.0150.01315.72
5.5.240.0170.00815.84
5.5.230.0140.01415.73
5.5.220.0160.01015.81
5.5.210.0170.01015.76
5.5.200.0210.00815.82
5.5.190.0160.01115.85
5.5.180.0150.01415.82
5.5.170.0170.01115.79
5.5.160.0200.00715.79
5.5.150.0140.01315.85
5.5.140.0190.00915.81
5.5.130.0190.00815.85
5.5.120.0190.00915.72
5.5.110.0140.01115.75
5.5.100.0130.01515.85
5.5.90.0160.01015.79
5.5.80.0110.01315.87
5.5.70.0140.01315.74
5.5.60.0160.01015.70
5.5.50.0150.01215.79
5.5.40.0140.01215.81
5.5.30.0110.01315.67
5.5.20.0140.01015.74
5.5.10.0120.01115.75
5.5.00.0090.01515.67
5.4.450.0130.01012.55
5.4.440.0140.00812.67
5.4.430.0120.01112.57
5.4.420.0100.01212.63
5.4.410.0150.00812.57
5.4.400.0160.00612.67
5.4.390.0160.00912.69
5.4.380.0130.01012.62
5.4.370.0130.01012.45
5.4.360.0170.00612.45
5.4.350.0180.00712.54
5.4.340.0160.00812.59
5.4.330.0150.01012.38
5.4.320.0100.01212.62
5.4.310.0140.00812.61
5.4.300.0230.00912.51
5.4.290.0150.00912.56
5.4.280.0130.01012.45
5.4.270.0130.00912.65
5.4.260.0160.01212.52
5.4.250.0150.00612.55
5.4.240.0180.00612.50
5.4.230.0140.00712.53
5.4.220.0160.00712.44
5.4.210.0150.00812.59
5.4.200.0120.00912.53
5.4.190.0130.00812.68
5.4.180.0150.00712.54
5.4.170.0120.00812.55
5.4.160.0140.00712.58
5.4.150.0160.00412.54
5.4.140.0120.00812.62
5.4.130.0140.00712.68
5.4.120.0140.00612.63
5.4.110.0160.00512.58
5.4.100.0130.00912.50
5.4.90.0160.00512.53
5.4.80.0120.01012.48
5.4.70.0140.00612.58
5.4.60.0090.01212.59
5.4.50.0140.00812.54
5.4.40.0130.01012.53
5.4.30.0190.00512.65
5.4.20.0140.00812.56
5.4.10.0130.00812.63
5.4.00.0130.00912.63
5.3.290.0140.01012.73
5.3.280.0120.00812.68
5.3.270.0110.01012.71
5.3.260.0120.00912.70
5.3.250.0120.00812.79
5.3.240.0130.00712.56
5.3.230.0130.00712.68
5.3.220.0100.00712.65
5.3.210.0150.00812.67
5.3.200.0110.00812.73
5.3.190.0130.00812.68
5.3.180.0110.00912.85
5.3.170.0120.00712.73
5.3.160.0140.01012.87
5.3.150.0090.01312.88
5.3.140.0090.01112.78
5.3.130.0160.00612.77
5.3.120.0110.01012.85
5.3.110.0140.00712.78
5.3.100.0120.00812.74
5.3.90.0140.00712.85
5.3.80.0160.00912.71
5.3.70.0140.00812.67
5.3.60.0110.00912.73
5.3.50.0130.00812.69
5.3.40.0120.00912.72
5.3.30.0130.00712.75
5.3.20.0120.01012.66
5.3.10.0100.00812.47
5.3.00.0130.00612.43
5.2.170.0080.01011.81
5.2.160.0100.00911.78
5.2.150.0080.00911.85
5.2.140.0130.00711.72
5.2.130.0130.00811.72
5.2.120.0110.00811.70
5.2.110.0120.00611.71
5.2.100.0090.01011.74
5.2.90.0120.00511.69
5.2.80.0140.00511.69
5.2.70.0110.00911.70
5.2.60.0130.00611.72
5.2.50.0110.00811.67
5.2.40.0110.00911.71
5.2.30.0130.00811.72
5.2.20.0140.00611.55
5.2.10.0110.00711.60
5.2.00.0120.00511.47
5.1.60.0110.00611.11
5.1.50.0100.00811.15
5.1.40.0100.00511.22
5.1.30.0080.00911.24
5.1.20.0100.00711.17
5.1.10.0140.00411.15
5.1.00.0110.00711.15
5.0.50.0080.00611.02
5.0.40.0090.00511.02
5.0.30.0100.00611.02
5.0.20.0090.00611.02
5.0.10.0100.00311.02
5.0.00.0100.00411.02
4.4.90.0050.00611.02
4.4.80.0030.00611.02
4.4.70.0060.00311.02
4.4.60.0050.00311.02
4.4.50.0090.00111.02
4.4.40.0070.00311.02
4.4.30.0050.00411.02
4.4.20.0080.00111.02
4.4.10.0060.00311.02
4.4.00.0040.00411.02
4.3.110.0050.00311.02
4.3.100.0060.00211.02
4.3.90.0040.00511.02
4.3.80.0070.00311.02
4.3.70.0060.00211.02
4.3.60.0070.00311.02
4.3.50.0050.00611.02
4.3.40.0070.00211.02
4.3.30.0040.00311.02
4.3.20.0060.00211.02
4.3.10.0040.00411.02
4.3.00.0040.00411.02

preferences:
71.29 ms | 400 KiB | 5 Q