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 $item) { var_dump(key($array)); } 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 emptxy 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)
8.3.60.0170.00318.43
8.3.50.0150.00522.11
8.3.40.0110.00718.88
8.3.30.0110.00318.97
8.3.20.0040.00418.91
8.3.10.0030.00521.23
8.3.00.0070.00021.82
8.2.180.0120.00916.63
8.2.170.0180.00422.96
8.2.160.0130.00720.29
8.2.150.0040.00424.18
8.2.140.0080.00024.66
8.2.130.0060.00326.16
8.2.120.0000.00721.07
8.2.110.0070.00420.39
8.2.100.0000.01217.97
8.2.90.0000.00819.38
8.2.80.0080.00017.97
8.2.70.0120.00017.63
8.2.60.0040.00418.16
8.2.50.0090.00318.07
8.2.40.0050.00218.22
8.2.30.0040.00421.09
8.2.20.0040.00417.85
8.2.10.0000.00817.80
8.2.00.0070.00317.64
8.1.280.0130.00725.92
8.1.270.0070.00023.99
8.1.260.0030.00626.35
8.1.250.0080.00028.09
8.1.240.0000.01022.63
8.1.230.0000.01120.92
8.1.220.0040.00418.77
8.1.210.0030.00618.77
8.1.200.0040.00417.35
8.1.190.0030.00617.51
8.1.180.0050.00318.10
8.1.170.0000.00818.53
8.1.160.0050.00218.91
8.1.150.0040.00418.62
8.1.140.0080.00017.39
8.1.130.0030.00317.84
8.1.120.0020.00517.51
8.1.110.0040.00417.47
8.1.100.0000.00717.39
8.1.90.0050.00217.49
8.1.80.0030.00617.48
8.1.70.0030.00317.38
8.1.60.0000.01417.48
8.1.50.0000.00717.49
8.1.40.0000.00917.50
8.1.30.0000.01017.60
8.1.20.0040.00417.66
8.1.10.0080.00017.64
8.1.00.0040.00417.54
8.0.300.0060.00319.98
8.0.290.0050.00317.16
8.0.280.0000.00818.48
8.0.270.0000.00817.29
8.0.260.0030.00316.89
8.0.250.0000.00717.05
8.0.240.0070.00416.97
8.0.230.0070.00017.10
8.0.220.0000.00716.88
8.0.210.0070.00016.96
8.0.200.0000.00617.05
8.0.190.0050.00216.92
8.0.180.0000.00716.91
8.0.170.0040.00417.05
8.0.160.0030.00316.98
8.0.150.0050.00316.81
8.0.140.0040.00416.93
8.0.130.0030.00313.39
8.0.120.0000.00817.00
8.0.110.0090.00016.98
8.0.100.0040.00416.80
8.0.90.0070.00016.97
8.0.80.0070.01116.96
8.0.70.0000.00717.00
8.0.60.0000.00716.82
8.0.50.0000.00716.84
8.0.30.0070.01117.10
8.0.20.0110.00817.40
8.0.10.0040.00417.16
8.0.00.0060.01116.78
7.4.330.0020.00216.77
7.4.320.0060.00016.54
7.4.300.0030.00316.63
7.4.290.0030.00316.64
7.4.280.0030.00616.53
7.4.270.0030.00316.54
7.4.260.0030.00313.30
7.4.250.0040.00416.59
7.4.240.0000.00716.58
7.4.230.0040.00416.43
7.4.220.0150.00316.60
7.4.210.0060.00816.56
7.4.200.0030.00316.38
7.4.190.0080.00016.43
7.4.160.0100.00616.55
7.4.150.0130.01317.40
7.4.140.0080.01217.86
7.4.130.0100.00916.59
7.4.120.0130.00416.41
7.4.110.0160.00616.34
7.4.100.0110.00616.59
7.4.90.0080.01116.46
7.4.80.0110.01219.39
7.4.70.0090.00916.59
7.4.60.0080.00816.69
7.4.50.0040.00416.68
7.4.40.0060.00922.77
7.4.30.0090.00916.52
7.4.10.0150.00615.09
7.4.00.0080.01014.92
7.3.330.0000.00613.16
7.3.320.0080.00413.25
7.3.310.0030.00316.41
7.3.300.0000.00716.43
7.3.290.0100.00616.40
7.3.280.0080.00816.35
7.3.270.0130.00317.40
7.3.260.0100.01018.24
7.3.250.0080.00816.45
7.3.240.0090.00916.38
7.3.230.0070.01016.39
7.3.210.0080.00816.46
7.3.200.0080.01119.39
7.3.190.0100.01016.63
7.3.180.0110.00816.37
7.3.170.0120.00416.35
7.3.160.0130.00316.47
7.3.130.0190.00314.72
7.3.120.0110.00814.89
7.3.110.0050.01514.91
7.3.100.0040.01214.80
7.3.90.0020.01214.76
7.3.80.0020.00814.83
7.3.70.0040.01214.83
7.3.60.0100.00514.82
7.3.50.0030.00814.88
7.3.40.0050.00914.84
7.3.30.0060.00714.81
7.3.20.0070.00716.67
7.3.10.0040.00816.59
7.3.00.0060.00716.70
7.2.330.0130.00316.49
7.2.320.0140.00316.56
7.2.310.0100.01016.70
7.2.300.0060.01116.68
7.2.290.0090.01516.71
7.2.260.0130.01015.14
7.2.250.0070.01215.07
7.2.240.0040.01415.03
7.2.230.0110.00515.10
7.2.220.0080.00614.92
7.2.210.0060.00814.94
7.2.200.0060.00815.08
7.2.190.0060.00914.86
7.2.180.0030.00914.92
7.2.170.0080.00815.06
7.2.160.0030.01014.99
7.2.150.0070.01016.75
7.2.140.0060.00616.88
7.2.130.0040.01316.81
7.2.120.0030.01016.94
7.2.110.0090.00616.92
7.2.100.0070.00616.88
7.2.90.0070.00716.94
7.2.80.0070.00716.80
7.2.70.0000.01116.85
7.2.60.0040.00916.83
7.2.50.0080.00817.08
7.2.40.0060.00616.89
7.2.30.0080.00516.83
7.2.20.0070.00516.67
7.2.10.0050.00916.86
7.2.00.0080.00717.85
7.1.330.0040.01015.81
7.1.320.0090.00715.85
7.1.310.0040.00815.86
7.1.300.0020.01115.77
7.1.290.0020.00915.74
7.1.280.0020.01115.60
7.1.270.0030.01115.70
7.1.260.0030.00815.77
7.1.250.0070.00615.73
7.1.240.0030.01015.86
7.1.230.0000.01215.77
7.1.220.0000.01415.69
7.1.210.0050.00315.78
7.1.200.0030.00915.77
7.1.190.0090.00315.73
7.1.180.0070.00715.95
7.1.170.0100.00315.70
7.1.160.0040.01115.74
7.1.150.0090.00315.61
7.1.140.0000.01115.49
7.1.130.0000.01115.76
7.1.120.0080.00415.50
7.1.110.0120.00315.75
7.1.100.0080.00516.99
7.1.90.0090.00615.66
7.1.80.0000.01215.52
7.1.70.0030.00516.56
7.1.60.0060.00917.65
7.1.50.0070.01416.31
7.1.40.0090.00615.64
7.1.30.0050.00515.71
7.1.20.0090.00315.73
7.1.10.0000.01415.41
7.1.00.0070.02019.01
7.0.330.0040.01115.13
7.0.320.0070.00315.38
7.0.310.0040.00815.50
7.0.300.0030.01015.35
7.0.290.0040.00714.96
7.0.280.0060.00315.23
7.0.270.0000.01315.54
7.0.260.0070.00715.16
7.0.250.0070.00714.95
7.0.240.0060.00915.45
7.0.230.0100.00315.23
7.0.220.0000.01215.49
7.0.210.0060.00315.32
7.0.200.0090.00616.03
7.0.190.0000.01015.26
7.0.180.0100.00015.09
7.0.170.0070.00715.32
7.0.160.0060.00915.56
7.0.150.0060.00315.22
7.0.140.0050.04018.57
7.0.130.0080.00615.43
7.0.120.0100.00315.46
7.0.110.0060.00615.18
7.0.100.0090.00315.18
7.0.90.0070.00715.16
7.0.80.0030.00615.13
7.0.70.0060.01818.63
7.0.60.0050.03918.50
7.0.50.0070.03718.85
7.0.40.0090.03516.66
7.0.30.0000.04916.68
7.0.20.0080.03016.71
7.0.10.0130.03716.72
7.0.00.0050.02816.80
5.6.400.0040.00814.58
5.6.390.0030.00714.45
5.6.380.0070.01014.25
5.6.370.0000.01314.64
5.6.360.0030.01014.32
5.6.350.0030.01014.60
5.6.340.0130.00014.50
5.6.330.0040.01114.57
5.6.320.0030.01014.25
5.6.310.0090.00314.18
5.6.300.0100.00014.20
5.6.290.0030.00614.34
5.6.280.0080.02317.85
5.6.270.0030.01214.53
5.6.260.0070.00714.23
5.6.250.0090.00314.25
5.6.240.0030.00514.40
5.6.230.0060.00914.46
5.6.220.0020.02117.52
5.6.210.0050.02317.48
5.6.200.0050.02717.67
5.6.190.0070.04017.73
5.6.180.0030.04717.73
5.6.170.0000.04617.72
5.6.160.0080.04117.71
5.6.150.0020.05017.77
5.6.140.0120.03517.68
5.6.130.0060.04517.67
5.6.120.0120.03817.65
5.6.110.0100.04217.61
5.6.100.0070.03717.69
5.6.90.0070.04817.75
5.6.80.0080.03817.21
5.6.70.0120.02717.36
5.6.60.0070.02717.48
5.6.50.0090.02717.48
5.6.40.0080.03017.26
5.6.30.0020.05017.34
5.6.20.0060.04117.45
5.6.10.0100.04017.38
5.6.00.0030.04617.42
5.5.380.0000.01414.49
5.5.370.0060.00614.37
5.5.360.0020.02717.48
5.5.350.0050.04817.27
5.5.340.0110.03617.38
5.5.330.0090.04317.60
5.5.320.0090.04217.55
5.5.310.0030.04817.66
5.5.300.0080.02817.58
5.5.290.0000.04417.50
5.5.280.0030.03917.56
5.5.270.0070.04817.65
5.5.260.0080.04417.61
5.5.250.0080.04317.41
5.5.240.0030.04617.17
5.5.230.0090.04017.35
5.5.220.0030.02317.31
5.5.210.0030.04617.17
5.5.200.0050.04217.30
5.5.190.0100.04117.23
5.5.180.0050.04517.17
5.5.170.0110.00414.07
5.5.160.0080.02317.40
5.5.150.0030.04417.13
5.5.140.0050.04017.13
5.5.130.0050.04217.30
5.5.120.0030.04317.39
5.5.110.0030.04617.30
5.5.100.0030.03317.10
5.5.90.0090.02517.28
5.5.80.0040.04617.13
5.5.70.0050.04217.12
5.5.60.0040.04017.13
5.5.50.0040.03317.37
5.5.40.0050.03917.05
5.5.30.0090.04217.10
5.5.20.0030.04917.14
5.5.10.0030.04517.24
5.5.00.0070.02717.17
5.4.450.0100.03915.29
5.4.440.0080.04015.18
5.4.430.0050.03515.12
5.4.420.0020.02415.27
5.4.410.0080.04015.24
5.4.400.0030.04214.96
5.4.390.0060.03114.94
5.4.380.0070.03714.95
5.4.370.0030.03814.98
5.4.360.0050.03715.00
5.4.350.0030.04114.95
5.4.340.0090.02915.02
5.4.330.0060.00611.14
5.4.320.0080.04015.13
5.4.310.0050.02214.94
5.4.300.0030.04514.92
5.4.290.0090.03815.02
5.4.280.0080.03915.10
5.4.270.0050.03814.93
5.4.260.0090.03415.04
5.4.250.0060.03515.10
5.4.240.0030.03514.92
5.4.230.0060.03915.19
5.4.220.0050.03714.97
5.4.210.0030.04415.05
5.4.200.0070.03715.07
5.4.190.0050.04015.10
5.4.180.0050.03814.93
5.4.170.0060.04115.13
5.4.160.0030.04814.74
5.4.150.0030.04515.18
5.4.140.0100.03813.79
5.4.130.0060.03713.72
5.4.120.0070.03713.72
5.4.110.0050.03513.64
5.4.100.0030.03513.60
5.4.90.0050.03513.60
5.4.80.0030.03913.58
5.4.70.0020.04413.63
5.4.60.0010.03113.52
5.4.50.0080.03813.60
5.4.40.0050.03813.68
5.4.30.0030.03313.63
5.4.20.0060.04013.66
5.4.10.0030.02513.70
5.4.00.0090.03013.37
5.3.290.0030.03612.56
5.3.280.0040.04112.48
5.3.270.0030.04212.39
5.3.260.0030.03312.50
5.3.250.0040.03912.59
5.3.240.0030.03912.50
5.3.230.0020.04312.55
5.3.220.0020.04012.38
5.3.210.0020.04012.44
5.3.200.0020.04312.33
5.3.190.0030.04312.55
5.3.180.0020.03112.64
5.3.170.0040.03412.44
5.3.160.0080.03512.47
5.3.150.0020.04212.54
5.3.140.0090.03512.55
5.3.130.0070.03412.53
5.3.120.0050.03712.54
5.3.110.0060.02712.49
5.3.100.0040.03512.23
5.3.90.0020.03812.28
5.3.80.0020.04112.22
5.3.70.0030.04112.08
5.3.60.0050.03812.17
5.3.50.0070.02612.06
5.3.40.0030.03812.25
5.3.30.0040.03412.02
5.3.20.0030.03712.04
5.3.10.0010.03411.93
5.3.00.0010.03911.82
5.2.170.0000.06711.00
5.2.160.0030.06011.10
5.2.150.0000.06010.97
5.2.140.0030.04311.18
5.2.130.0070.05011.09
5.2.120.0030.04710.90
5.2.110.0070.05310.96
5.2.100.0000.06711.04
5.2.90.0000.06711.18
5.2.80.0030.04711.16
5.2.70.0030.06311.03
5.2.60.0000.06311.02
5.2.50.0030.06311.07
5.2.40.0070.07011.07
5.2.30.0000.06310.79
5.2.20.0070.06011.02
5.2.10.0030.04310.93
5.2.00.0070.05710.79
5.1.60.0070.05310.79
5.1.50.0100.04710.79
5.1.40.0100.04710.79
5.1.30.0030.05710.79
5.1.20.0000.06010.79
5.1.10.0030.05310.79
5.1.00.0070.05310.79
5.0.50.0000.04710.79
5.0.40.0000.04010.79
5.0.30.0070.06010.79
5.0.20.0030.04310.79
5.0.10.0000.04710.79
5.0.00.0070.06310.79
4.4.90.0000.03310.79
4.4.80.0030.02710.79
4.4.70.0070.03010.79
4.4.60.0030.03010.79
4.4.50.0030.03310.79
4.4.40.0000.05310.79
4.4.30.0030.02710.79
4.4.20.0000.04010.79
4.4.10.0000.03310.79
4.4.00.0030.05310.79
4.3.110.0000.02310.79
4.3.100.0000.03010.79
4.3.90.0000.03710.79
4.3.80.0000.04310.79
4.3.70.0030.03310.79
4.3.60.0000.03010.79
4.3.50.0000.03310.79
4.3.40.0030.05010.79
4.3.30.0000.03710.79
4.3.20.0000.03710.79
4.3.10.0000.03710.79
4.3.00.0030.03310.79

preferences:
40.39 ms | 401 KiB | 5 Q