3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [0, 1, 2]; $ref =& $array; // Necessary to trigger the old behavior foreach ($array as $k => &$val) { echo $val . ' '; if($k < 5 && !isset($array[$k+1])) $array[$k+1] = $val+1; if($k == 1) array_unshift($array, 'X'); } echo PHP_EOL . json_encode($array);

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)
8.3.60.0040.01516.50
8.3.50.0120.00821.21
8.3.40.0110.00418.82
8.3.30.0040.01119.02
8.3.20.0020.00520.20
8.3.10.0040.00423.66
8.3.00.0000.00819.79
8.2.180.0150.00418.54
8.2.170.0110.00422.96
8.2.160.0110.00319.50
8.2.150.0070.00324.18
8.2.140.0050.00324.66
8.2.130.0080.00026.16
8.2.120.0060.00317.75
8.2.110.0030.00621.98
8.2.100.0040.00817.75
8.2.90.0080.00019.27
8.2.80.0050.00317.97
8.2.70.0000.00917.63
8.2.60.0000.00817.93
8.2.50.0040.00418.07
8.2.40.0050.00321.07
8.2.30.0040.00717.99
8.2.20.0000.00817.84
8.2.10.0040.00418.22
8.2.00.0040.00418.04
8.1.280.0110.00425.92
8.1.270.0120.00620.42
8.1.260.0080.00026.35
8.1.250.0000.00828.09
8.1.240.0060.00322.54
8.1.230.0140.00417.42
8.1.220.0000.00817.74
8.1.210.0000.00818.77
8.1.200.0080.00517.35
8.1.190.0080.00017.23
8.1.180.0040.00418.10
8.1.170.0050.00218.46
8.1.160.0030.00522.07
8.1.150.0040.00418.78
8.1.140.0080.00017.37
8.1.130.0040.00417.68
8.1.120.0040.00417.45
8.1.110.0070.00017.37
8.1.100.0000.00717.48
8.1.90.0050.00217.42
8.1.80.0020.00517.45
8.1.70.0050.00217.37
8.1.60.0040.00417.59
8.1.50.0050.00317.49
8.1.40.0040.00417.39
8.1.30.0000.00817.64
8.1.20.0000.00817.65
8.1.10.0040.00417.63
8.1.00.0040.00417.35
8.0.300.0040.00418.77
8.0.290.0030.00316.75
8.0.280.0000.00718.36
8.0.270.0030.00317.16
8.0.260.0060.00017.21
8.0.250.0030.00516.91
8.0.240.0000.00716.92
8.0.230.0030.00316.91
8.0.220.0040.00416.87
8.0.210.0040.00416.81
8.0.200.0080.00017.04
8.0.190.0000.00717.06
8.0.180.0050.00216.92
8.0.170.0050.00216.92
8.0.160.0040.00416.97
8.0.150.0040.00416.96
8.0.140.0040.00416.92
8.0.130.0030.00313.33
8.0.120.0030.00516.95
8.0.110.0070.00016.86
8.0.100.0070.00017.01
8.0.90.0040.00416.79
8.0.80.0040.01116.94
8.0.70.0070.00017.04
8.0.60.0000.00716.98
8.0.50.0050.00216.92
8.0.30.0050.01417.09
8.0.20.0080.01117.40
8.0.10.0040.00417.00
8.0.00.0060.01116.95
7.4.330.0000.00515.09
7.4.320.0060.00016.50
7.4.300.0000.00616.51
7.4.290.0000.00816.54
7.4.280.0080.00016.39
7.4.270.0030.00316.35
7.4.260.0070.00016.60
7.4.250.0000.00816.44
7.4.240.0000.00716.58
7.4.230.0000.00716.59
7.4.220.0180.00716.51
7.4.210.0070.01216.60
7.4.200.0050.00216.39
7.4.160.0200.00316.64
7.4.150.0120.00617.40
7.4.140.0110.00717.86
7.4.130.0100.00716.64
7.4.120.0050.01416.43
7.4.110.0100.01416.56
7.4.100.0060.01216.46
7.4.90.0100.00716.59
7.4.80.0030.01919.39
7.4.70.0110.00816.48
7.4.60.0120.00416.29
7.4.50.0080.00016.29
7.4.40.0120.01116.48
7.4.30.0160.00816.26
7.3.330.0000.00613.07
7.3.320.0050.00013.23
7.3.310.0070.00016.18
7.3.300.0000.00716.34
7.3.290.0030.00316.18
7.3.280.0090.01016.28
7.3.270.0070.01017.40
7.3.260.0040.01416.47
7.3.250.0100.00816.40
7.3.240.0040.01416.62
7.3.230.0100.00716.39
7.3.210.0150.00416.28
7.3.200.0160.00616.25
7.3.190.0070.01016.53
7.3.180.0130.00916.39
7.3.170.0130.00416.36
7.3.160.0110.00616.36
7.2.330.0250.01916.46
7.2.320.0130.00616.57
7.2.310.0060.01116.46
7.2.300.0030.01916.34
7.2.290.0060.01316.28
7.0.90.0100.08719.94
7.0.80.0170.06719.98
7.0.70.0000.04319.87
7.0.60.0470.07019.95
7.0.50.0030.04020.32
7.0.40.0030.04320.19
7.0.30.0070.04020.18
7.0.20.0070.03719.98
7.0.10.0130.06020.09
7.0.00.0000.04720.18
5.6.240.0400.28021.78
5.6.230.0230.33721.93
5.6.220.0100.36721.76
5.6.210.0200.30321.91
5.6.200.0170.36022.29
5.6.190.0130.36022.29
5.6.180.0100.29022.37
5.6.170.0200.27322.30
5.6.160.0200.30322.30
5.6.150.0200.32022.22
5.6.140.0270.33022.22
5.6.130.0270.36022.32
5.6.120.0230.26722.40
5.6.110.0270.35022.37
5.6.100.0300.28022.28
5.6.90.0130.28322.38
5.6.80.0230.38021.60
5.6.70.0330.26721.65
5.6.60.0300.32721.64
5.6.50.0130.34721.72
5.6.40.0330.36021.72
5.6.30.0370.31321.80
5.6.20.0270.28721.58
5.6.10.0170.28321.72
5.6.00.0200.27721.71
5.5.380.0171.83322.71
5.5.370.0331.94022.66
5.5.360.0171.96022.78
5.5.350.0231.87722.67
5.5.340.0301.90723.03
5.5.330.0101.90023.17
5.5.320.0231.84023.18
5.5.310.0101.95323.16
5.5.300.0231.91323.12
5.5.290.0201.89723.21
5.5.280.0101.90023.21
5.5.270.0071.80323.06
5.5.260.0301.99022.97
5.5.250.0201.85023.00
5.5.240.0301.88322.55
5.5.230.0331.87322.48
5.5.220.0271.78022.47
5.5.210.0301.88722.58
5.5.200.2131.72722.38
5.5.190.0472.02022.29
5.5.180.0271.88722.50
5.5.160.0301.76022.41
5.5.150.0171.96022.53
5.5.140.0301.99722.43
5.5.130.0301.73722.44
5.5.120.0271.89022.52
5.5.110.0071.95022.47
5.5.100.0302.03322.36
5.5.90.0131.91022.36
5.5.80.0171.93022.27
5.5.70.0201.96022.26
5.5.60.0201.82722.43
5.5.50.0401.84322.29
5.5.40.0331.95722.29
5.5.30.0301.93722.22
5.5.20.0101.82722.44
5.5.10.0131.78022.25
5.5.00.0271.94722.26
5.4.450.0371.98321.54
5.4.440.0071.90321.36
5.4.430.0231.98721.48
5.4.420.0231.94021.64
5.4.410.0131.86021.45
5.4.400.0301.93721.25
5.4.390.0271.73321.10
5.4.380.0331.86721.15
5.4.370.0201.89721.18
5.4.360.0271.79021.36
5.4.350.0301.84321.30
5.4.340.0171.75021.24
5.4.320.0271.83021.20
5.4.310.0331.85721.30
5.4.300.0131.89721.25
5.4.290.0231.83321.02
5.4.280.0231.89321.15
5.4.270.0171.93021.10
5.4.260.0171.85721.16
5.4.250.0271.90321.10
5.4.240.0171.78021.16
5.4.230.0301.93321.19
5.4.220.0171.89021.35
5.4.210.0171.90721.02
5.4.200.0371.83721.25
5.4.190.0201.87021.23
5.4.180.0101.80021.23
5.4.170.0271.87321.09
5.4.160.0271.77021.18
5.4.150.0331.88021.24
5.4.140.0201.94318.49
5.4.130.0201.87318.37
5.4.120.0131.85318.48
5.4.110.0301.91018.55
5.4.100.0301.88718.69
5.4.90.0201.92318.52
5.4.80.0131.98718.46
5.4.70.0301.91718.54
5.4.60.0201.95318.68
5.4.50.1471.81718.45
5.4.40.2371.73318.43
5.4.30.0331.86718.59
5.4.20.0132.00718.54
5.4.10.0201.93318.68
5.4.00.0401.85317.87

preferences:
51.36 ms | 401 KiB | 5 Q