3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(); echo PHP_EOL . ' on empty array: ' . PHP_EOL; var_dump(key($array)); $array[] = 'f'; echo PHP_EOL . ' size one array: ' . PHP_EOL; var_dump(key($array)); $array[] = 'f'; echo PHP_EOL . ' size two array: ' . PHP_EOL; var_dump(key($array)); echo PHP_EOL . ' within loop: ' . PHP_EOL; foreach ($array as $key => $value) { var_dump(key($array)); if ($key == 0) { echo PHP_EOL . ' unsetting first element.... ' . PHP_EOL; unset($array[$key]); } if ($key == 1) { echo PHP_EOL . ' unsetting second element.... ' . PHP_EOL; unset($array[$key]); } } echo PHP_EOL . ' after loop: ' . PHP_EOL; var_dump(key($array)); reset($array); echo PHP_EOL . ' after reset: ' . PHP_EOL; var_dump(key($array)); end($array); echo PHP_EOL . ' after end: ' . PHP_EOL; var_dump(key($array)); echo PHP_EOL . ' trying to trigger "Undefined index: " error: with NULL key' . PHP_EOL; $array[null]; echo PHP_EOL . ' trying to trigger "Undefined index: " error: with empty string key' . PHP_EOL; $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)
8.3.60.0150.00618.43
8.3.50.0170.00522.11
8.3.40.0060.00918.70
8.3.30.0110.00418.83
8.3.20.0040.01118.69
8.3.10.0030.01320.53
8.3.00.0120.00019.38
8.2.180.0140.00716.63
8.2.170.0110.00422.96
8.2.160.0100.00322.15
8.2.150.0000.00824.18
8.2.140.0030.00624.66
8.2.130.0050.00226.16
8.2.120.0070.00020.02
8.2.110.0000.00922.11
8.2.100.0110.00018.03
8.2.90.0000.00819.18
8.2.80.0040.00418.05
8.2.70.0060.00317.75
8.2.60.0030.00618.16
8.2.50.0040.00418.16
8.2.40.0000.00818.23
8.2.30.0000.00719.79
8.2.20.0000.00717.80
8.2.10.0060.00317.70
8.2.00.0000.00817.76
8.1.280.0150.00625.92
8.1.270.0040.00423.99
8.1.260.0030.00526.35
8.1.250.0090.00028.09
8.1.240.0130.00622.65
8.1.230.0050.00520.89
8.1.220.0040.00418.77
8.1.210.0000.00818.88
8.1.200.0100.00017.35
8.1.190.0060.00317.51
8.1.180.0040.00418.10
8.1.170.0040.00418.89
8.1.160.0050.00518.95
8.1.150.0040.00418.61
8.1.140.0040.00417.34
8.1.130.0070.00017.81
8.1.120.0040.00417.51
8.1.110.0070.00017.41
8.1.100.0000.00717.51
8.1.90.0000.00817.48
8.1.80.0070.00017.49
8.1.70.0030.00717.44
8.1.60.0000.00717.48
8.1.50.0080.00017.42
8.1.40.0000.00817.51
8.1.30.0000.00817.59
8.1.20.0040.00417.60
8.1.10.0040.00417.55
8.1.00.0040.00417.57
8.0.300.0040.00420.08
8.0.290.0000.00716.75
8.0.280.0030.00518.37
8.0.270.0030.00317.15
8.0.260.0000.00616.95
8.0.250.0040.00417.01
8.0.240.0030.00717.04
8.0.230.0040.00416.93
8.0.220.0030.00317.00
8.0.210.0070.00016.99
8.0.200.0000.00717.04
8.0.190.0050.00316.93
8.0.180.0040.00416.91
8.0.170.0040.00416.93
8.0.160.0030.00516.95
8.0.150.0030.00516.80
8.0.140.0110.00016.89
8.0.130.0070.00013.34
8.0.120.0000.00716.91
8.0.110.0000.00816.86
8.0.100.0000.00716.96
8.0.90.0070.00016.94
8.0.80.0000.01616.92
8.0.70.0000.00816.92
8.0.60.0050.00316.92
8.0.50.0080.00016.96
8.0.30.0020.01817.07
8.0.20.0160.00917.40
8.0.10.0000.00717.13
8.0.00.0100.00816.66
7.4.330.0030.00314.70
7.4.320.0030.00316.63
7.4.300.0000.00716.57
7.4.290.0040.00416.38
7.4.280.0070.00016.60
7.4.270.0040.00316.52
7.4.260.0000.00713.30
7.4.250.0050.00316.48
7.4.240.0000.00716.39
7.4.230.0030.00516.72
7.4.220.0050.01216.41
7.4.210.0090.00716.62
7.4.200.0030.00316.60
7.4.190.0050.00216.52
7.4.160.0150.00416.50
7.4.150.0120.01217.40
7.4.140.0120.00717.86
7.4.130.0120.00716.62
7.4.120.0120.00916.70
7.4.110.0060.01116.68
7.4.100.0140.00316.46
7.4.90.0030.01716.64
7.4.80.0080.00819.03
7.4.70.0060.01816.65
7.4.60.0070.01016.59
7.4.50.0000.00816.57
7.4.40.0090.00922.27
7.4.30.0060.01116.40
7.4.00.0110.00415.19
7.3.330.0030.00313.29
7.3.320.0040.00413.25
7.3.310.0000.00716.18
7.3.300.0000.00716.24
7.3.290.0030.01016.34
7.3.280.0070.01116.35
7.3.270.0070.01517.40
7.3.260.0130.00818.24
7.3.250.0120.00816.46
7.3.240.0100.00716.35
7.3.230.0070.01016.45
7.3.210.0110.00716.39
7.3.200.0160.00319.39
7.3.190.0090.01216.59
7.3.180.0100.01016.38
7.3.170.0080.00816.57
7.3.160.0120.00616.45
7.3.120.0040.01115.03
7.2.330.0100.01616.83
7.2.320.0110.00716.41
7.2.310.0090.01316.47
7.2.300.0110.00716.80
7.2.290.0090.00916.69
7.2.60.0100.00316.99
7.2.00.0000.01619.49
7.1.200.0040.00715.80
7.1.100.0130.01316.37
7.1.70.0000.01016.93
7.1.60.0040.02219.40
7.1.50.0070.00716.71
7.1.00.0030.06722.28
7.0.200.0070.01016.68
7.0.140.0100.07021.92
7.0.60.0100.07719.92
7.0.50.0100.03717.67
7.0.40.0070.06020.06
7.0.30.0230.05020.42
7.0.20.0200.05720.19
7.0.10.0030.04020.21
7.0.00.0200.07720.17
5.6.210.0000.05720.51
5.6.200.0070.08718.22
5.6.190.0130.04720.41
5.6.180.0270.06720.43
5.6.170.0670.06320.50
5.6.160.0070.04020.37
5.6.150.0070.04318.11
5.6.140.0070.06718.12
5.6.130.0030.07018.21
5.6.120.0100.07321.00
5.6.110.0070.06021.02
5.6.100.0070.08321.00
5.6.90.0030.08021.00
5.6.80.0030.04020.39
5.6.70.0230.07720.50
5.5.350.1070.03720.36
5.5.340.0070.07717.93
5.5.330.0070.06320.40
5.5.320.0370.06720.40
5.5.310.0270.06720.28
5.5.300.0030.08717.98
5.5.290.0100.07718.01
5.5.280.0030.07020.80
5.5.270.0070.05320.73
5.5.260.0100.08020.88
5.5.250.0030.04020.62
5.5.240.0100.07320.16
5.4.450.0100.07719.11
5.4.440.0070.04319.44
5.4.430.0030.07019.41
5.4.420.0030.08019.11
5.4.410.0030.04319.38
5.4.400.0030.04019.09
5.4.390.0070.04719.18
5.4.380.0000.06719.08
5.4.370.0100.07319.00
5.4.360.0070.08019.18
5.4.350.0100.07319.18
5.4.340.0170.06719.18
5.4.320.0070.07318.80
5.4.310.0100.04318.79
5.4.300.0100.07018.91
5.4.290.0000.05319.17
5.4.280.0170.07018.81
5.4.270.0000.08019.17
5.4.260.0100.04019.08
5.4.250.0030.04718.80
5.4.240.0030.04019.07
5.4.230.0100.03318.80
5.4.220.0170.06018.90
5.4.210.0070.04719.08
5.4.200.0100.03319.16
5.4.190.0070.08019.14
5.4.180.0230.07018.79
5.4.170.0070.03718.80
5.4.160.0030.06319.16
5.4.150.0130.06018.76
5.4.140.0000.05716.26
5.4.130.0070.04016.36
5.4.120.0030.04716.24
5.4.110.0100.06016.40
5.4.100.0030.05316.32
5.4.90.0100.07016.32
5.4.80.0000.04716.22
5.4.70.0030.05716.29
5.4.60.0030.07716.27
5.4.50.0000.06316.22
5.4.40.0130.06716.32
5.4.30.0130.03716.21
5.4.20.0100.07016.24
5.4.10.0070.04716.18
5.4.00.0030.06715.70
5.3.290.0130.06714.62
5.3.280.0200.06014.40
5.3.270.0100.06714.54
5.3.260.0200.06314.55
5.3.250.0030.07014.56
5.3.240.0170.06314.59
5.3.230.0130.06014.57
5.3.220.0070.07314.52
5.3.210.0030.07014.54
5.3.200.0070.07314.37
5.3.190.0070.03714.55
5.3.180.0030.04014.66
5.3.170.0100.05714.52
5.3.160.0100.07014.37
5.3.150.0130.07314.50
5.3.140.0030.07314.37
5.3.130.0030.04014.46
5.3.120.0030.08014.50
5.3.110.0030.05714.66
5.3.100.0070.07313.98
5.3.90.0000.06713.82
5.3.80.0130.06313.82
5.3.70.0100.06713.97
5.3.60.0100.07313.93
5.3.50.0000.04013.75
5.3.40.0100.06313.91
5.3.30.0030.04013.88
5.3.20.0030.03713.63
5.3.10.0070.03013.59
5.3.00.0000.04013.61
5.2.170.0100.05011.11
5.2.160.0100.06011.10
5.2.150.0070.02711.05
5.2.140.0030.03011.19
5.2.130.0030.03011.00
5.2.120.0000.03011.01
5.2.110.0000.03311.05
5.2.100.0000.03011.05
5.2.90.0030.02711.10
5.2.80.0000.03010.96
5.2.70.0030.03010.96
5.2.60.0030.02710.95
5.2.50.0030.02710.85
5.2.40.0000.03010.94
5.2.30.0000.03010.82
5.2.20.0070.02310.91
5.2.10.0000.03010.73
5.2.00.0030.02710.74
5.1.60.0030.0209.98
5.1.50.0030.0239.99
5.1.40.0070.0239.97
5.1.30.0030.02710.35
5.1.20.0000.03310.38
5.1.10.0000.02710.09
5.1.00.0030.02310.14
5.0.50.0000.0208.53
5.0.40.0000.0238.44
5.0.30.0000.0308.14
5.0.20.0000.0208.22
5.0.10.0030.0178.10
5.0.00.0000.0308.32
4.4.90.0000.0138.02
4.4.80.0000.0178.02
4.4.70.0030.0138.02
4.4.60.0000.0178.02
4.4.50.0000.0208.02
4.4.40.0000.0278.02
4.4.30.0000.0178.02
4.4.20.0000.0178.02
4.4.10.0000.0138.02
4.4.00.0000.0238.02
4.3.110.0030.0138.02
4.3.100.0000.0138.02
4.3.90.0000.0138.02
4.3.80.0000.0238.02
4.3.70.0030.0138.02
4.3.60.0030.0138.02
4.3.50.0030.0138.02
4.3.40.0000.0238.02
4.3.30.0000.0178.02
4.3.20.0000.0208.02
4.3.10.0000.0138.02
4.3.00.0000.0138.02

preferences:
43.79 ms | 401 KiB | 5 Q