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 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)
8.3.40.0070.00718.98
8.3.30.0100.00319.18
8.3.20.0040.00420.21
8.3.10.0000.00821.92
8.3.00.0040.00422.39
8.2.170.0040.01122.96
8.2.160.0070.00720.43
8.2.150.0050.00224.18
8.2.140.0080.00024.66
8.2.130.0040.00426.16
8.2.120.0000.00819.36
8.2.110.0080.00022.20
8.2.100.0090.00317.84
8.2.90.0000.00819.30
8.2.80.0040.00417.97
8.2.70.0040.00417.75
8.2.60.0000.00818.05
8.2.50.0040.00418.07
8.2.40.0080.00318.08
8.2.30.0040.00418.25
8.2.20.0030.00517.71
8.2.10.0080.00017.86
8.2.00.0000.00717.82
8.1.270.0000.00923.97
8.1.260.0060.00326.35
8.1.250.0040.00428.09
8.1.240.0060.00323.64
8.1.230.0040.00719.15
8.1.220.0000.00917.74
8.1.210.0040.00418.77
8.1.200.0080.00617.11
8.1.190.0000.00817.28
8.1.180.0080.00018.10
8.1.170.0080.00018.46
8.1.160.0030.00521.93
8.1.150.0040.00418.73
8.1.140.0030.00617.45
8.1.130.0000.00717.72
8.1.120.0040.00317.49
8.1.110.0040.00417.51
8.1.100.0050.00217.48
8.1.90.0020.00517.53
8.1.80.0050.00317.48
8.1.70.0070.00017.41
8.1.60.0070.00317.53
8.1.50.0030.00617.43
8.1.40.0000.00817.52
8.1.30.0040.00417.58
8.1.20.0030.00617.52
8.1.10.0040.00417.48
8.1.00.0050.00317.55
8.0.300.0040.00418.77
8.0.290.0040.00417.30
8.0.280.0030.00518.33
8.0.270.0000.00717.20
8.0.260.0040.00416.90
8.0.250.0030.00317.03
8.0.240.0030.00317.04
8.0.230.0000.00717.02
8.0.220.0070.00016.88
8.0.210.0070.00016.86
8.0.200.0030.00317.04
8.0.190.0040.00416.91
8.0.180.0040.00416.89
8.0.170.0060.00316.99
8.0.160.0070.00016.89
8.0.150.0070.00017.04
8.0.140.0030.00416.84
8.0.130.0030.00313.33
8.0.120.0030.00616.98
8.0.110.0040.00416.86
8.0.100.0000.00716.82
8.0.90.0020.00516.88
8.0.80.0120.00416.92
8.0.70.0080.00016.77
8.0.60.0050.00217.02
8.0.50.0000.00716.82
8.0.30.0110.00817.05
8.0.20.0120.00717.40
8.0.10.0070.00016.98
8.0.00.0080.01316.81
7.4.330.0020.00215.02
7.4.320.0030.00316.58
7.4.300.0000.00716.53
7.4.290.0030.00516.57
7.4.280.0000.00816.51
7.4.270.0000.00716.61
7.4.260.0030.00316.53
7.4.250.0080.00016.44
7.4.240.0000.00716.56
7.4.230.0030.00316.52
7.4.220.0090.01516.45
7.4.210.0020.01216.58
7.4.200.0000.00716.65
7.4.190.0000.00716.67
7.4.160.0050.01016.34
7.4.150.0080.01117.40
7.4.140.0120.00617.86
7.4.130.0090.01216.46
7.4.120.0090.00916.57
7.4.110.0060.01016.60
7.4.100.0150.00616.41
7.4.90.0170.00016.51
7.4.80.0040.01216.56
7.4.70.0090.00916.58
7.4.60.0060.01216.36
7.4.50.0000.00816.73
7.4.40.0100.00222.77
7.4.30.0100.01016.60
7.4.00.0080.00815.07
7.3.330.0060.00013.31
7.3.320.0000.00613.13
7.3.310.0000.00716.43
7.3.300.0060.00016.44
7.3.290.0130.00716.33
7.3.280.0070.00916.35
7.3.270.0110.00717.40
7.3.260.0140.00716.38
7.3.250.0110.00916.43
7.3.240.0100.00616.44
7.3.230.0050.01116.55
7.3.210.0090.00916.42
7.3.200.0150.00319.39
7.3.190.0060.01216.65
7.3.180.0000.01516.56
7.3.170.0160.00616.51
7.3.160.0130.00316.51
7.3.120.0070.00714.73
7.3.110.0160.00014.67
7.3.100.0040.00814.78
7.3.90.0040.01114.83
7.3.80.0040.00815.12
7.3.70.0090.00614.74
7.3.60.0070.00714.87
7.3.50.0060.00914.66
7.3.40.0110.00414.64
7.3.30.0060.00914.69
7.3.20.0030.00816.79
7.3.10.0060.00916.67
7.3.00.0060.00916.45
7.2.330.0090.00916.54
7.2.320.0070.01516.71
7.2.310.0050.01316.63
7.2.300.0030.01316.45
7.2.290.0100.00716.57
7.2.240.0000.01514.92
7.2.230.0100.00315.18
7.2.220.0040.00815.06
7.2.210.0040.01114.77
7.2.200.0030.00714.83
7.2.190.0100.00314.91
7.2.180.0000.01314.81
7.2.170.0040.00714.90
7.2.160.0030.01014.89
7.2.150.0050.00516.84
7.2.140.0000.01017.09
7.2.130.0000.01016.88
7.2.120.0070.00716.98
7.2.110.0060.00917.03
7.2.100.0090.00317.02
7.2.90.0080.00816.83
7.2.80.0130.00016.96
7.2.70.0150.00016.58
7.2.60.0080.00817.01
7.2.50.0030.00816.89
7.2.40.0060.00916.85
7.2.30.0120.00317.11
7.2.20.0070.00716.81
7.2.10.0090.00616.85
7.2.00.0070.00918.21
7.1.330.0060.00615.58
7.1.320.0000.01115.80
7.1.310.0070.01015.75
7.1.300.0000.01215.80
7.1.290.0040.00815.73
7.1.280.0080.00315.92
7.1.270.0030.00915.71
7.1.260.0000.01315.74
7.1.250.0030.00715.66
7.1.200.0060.00615.77
7.1.70.0060.00317.19
7.1.60.0070.01719.82
7.1.50.0110.01116.86
7.1.00.0030.07722.54
7.0.200.0090.00316.54
7.0.140.0030.07321.92
7.0.110.0200.08019.89
7.0.100.0130.08319.84
7.0.90.0070.08319.92
7.0.80.0130.08019.87
7.0.70.0230.06019.79
7.0.60.0170.07319.94
7.0.50.0170.07720.25
7.0.40.0070.08719.96
7.0.30.0030.06720.26
7.0.20.0100.08020.27
7.0.10.0000.06020.18
7.0.00.0070.07720.15
5.6.280.0000.07721.05
5.6.260.0170.07320.61
5.6.250.0070.08020.64
5.6.240.0070.08020.51
5.6.230.0100.08020.49
5.6.220.0100.08020.49
5.6.210.0130.06720.56
5.6.200.0100.07720.94
5.6.190.0130.07721.08
5.6.180.0170.03021.30
5.6.170.0070.08021.14
5.6.160.0100.08020.96
5.6.150.0070.05021.06
5.6.140.0070.08321.19
5.6.130.0000.08721.03
5.6.120.0100.07321.27
5.6.110.0170.07321.09
5.6.100.0130.08020.98
5.6.90.0070.08021.12
5.6.80.0070.07720.34
5.6.70.0170.06720.64
5.6.60.0100.06720.56
5.6.50.0100.07720.41
5.6.40.0030.07720.31
5.6.30.0100.06020.42
5.6.20.0100.08020.50
5.6.10.0100.07720.58
5.6.00.0070.08320.48
5.5.380.0130.07020.46
5.5.370.0000.09020.48
5.5.360.0100.08020.48
5.5.350.0070.08020.37
5.5.340.0070.08720.89
5.5.330.0030.09020.79
5.5.320.0100.07720.89
5.5.310.0170.07320.74
5.5.300.0130.06320.81
5.5.290.0130.08020.99
5.5.280.0070.09020.84
5.5.270.0000.09021.03
5.5.260.0130.08020.86
5.5.250.0170.07020.72
5.5.240.0170.06320.34
5.5.230.0200.05320.25
5.5.220.0070.08020.33
5.5.210.0130.08020.22
5.5.200.0070.04720.20
5.5.190.0070.08020.13
5.5.180.0030.06720.05
5.5.160.0100.07320.24
5.5.150.0130.08020.09
5.5.140.0030.06720.13
5.5.130.0030.08020.19
5.5.120.0070.08020.05
5.5.110.0170.04020.25
5.5.100.0200.06020.27
5.5.90.0170.06720.25
5.5.80.0000.05020.00
5.5.70.0170.07020.24
5.5.60.0100.07020.04
5.5.50.0030.07720.23
5.5.40.0000.08320.03
5.5.30.0100.07319.96
5.5.20.0100.07320.20
5.5.10.0230.06320.07
5.5.00.0100.07720.11
5.4.450.0100.04719.51
5.4.440.0030.08319.51
5.4.430.0100.07719.35
5.4.420.0100.07719.27
5.4.410.0070.08719.20
5.4.400.0100.05319.08
5.4.390.0030.08318.93
5.4.380.0070.07719.01
5.4.370.0100.07719.03
5.4.360.0070.07019.01
5.4.350.0070.07718.98
5.4.340.0130.07019.25
5.4.320.0100.06319.27
5.4.310.0170.06319.27
5.4.300.0130.07318.94
5.4.290.0130.07719.02
5.4.280.0100.07018.92
5.4.270.0030.08019.02
5.4.260.0170.06719.11
5.4.250.0170.06719.09
5.4.240.0100.06018.94
5.4.230.0030.04718.94
5.4.220.0100.07318.94
5.4.210.0030.04719.17
5.4.200.0030.08019.14
5.4.190.0170.03719.11
5.4.180.0030.07719.04
5.4.170.0100.07019.11
5.4.160.0100.07319.14
5.4.150.0070.07319.15
5.4.140.0100.08016.44
5.4.130.0070.04716.41
5.4.120.0070.06016.16
5.4.110.0030.07716.38
5.4.100.0130.06716.36
5.4.90.0070.07716.48
5.4.80.0100.07016.12
5.4.70.0030.04716.27
5.4.60.0100.07016.52
5.4.50.0070.07016.34
5.4.40.0070.04016.55
5.4.30.0030.07316.47
5.4.20.0070.07316.36
5.4.10.0030.04316.34
5.4.00.0100.06715.59
5.3.290.0170.04014.75
5.3.280.0030.06314.61
5.3.270.0030.06014.55
5.3.260.0100.07714.63
5.3.250.0100.07014.45
5.3.240.0030.07314.51
5.3.230.0000.08314.54
5.3.220.0070.07314.59
5.3.210.0070.05014.64
5.3.200.0100.07014.44
5.3.190.0070.07014.46
5.3.180.0030.07314.59
5.3.170.0130.06714.46
5.3.160.0100.06714.50
5.3.150.0030.08014.40
5.3.140.0070.07314.41
5.3.130.0070.08014.45
5.3.120.0030.07014.62
5.3.110.0070.07014.46
5.3.100.0170.06014.04
5.3.90.0100.04014.11
5.3.80.0100.06314.01
5.3.70.0070.06714.12
5.3.60.0000.07713.80
5.3.50.0030.07713.89
5.3.40.0030.07713.80
5.3.30.0100.07014.02
5.3.20.0070.05013.49
5.3.10.0170.06313.45
5.3.00.0100.06013.54
5.2.170.0070.06012.52
5.2.160.0100.05312.52
5.2.150.0030.06012.52
5.2.140.0070.06012.52
5.2.130.0030.06312.52
5.2.120.0030.06312.52
5.2.110.0070.06012.52
5.2.100.0070.05712.52
5.2.90.0070.06012.52
5.2.80.0070.06012.52
5.2.70.0100.03312.52
5.2.60.0070.06312.52
5.2.50.0030.06012.52
5.2.40.0030.03312.52
5.2.30.0030.06312.52
5.2.20.0130.03712.52
5.2.10.0100.05312.52
5.2.00.0070.06012.52
5.1.60.0070.05312.52
5.1.50.0030.05712.52
5.1.40.0070.04012.52
5.1.30.0100.05012.52
5.1.20.0070.05712.52
5.1.10.0030.05712.52
5.1.00.0070.05712.52
5.0.50.0070.04312.52
5.0.40.0100.04012.52
5.0.30.0070.06312.52
5.0.20.0000.03712.52
5.0.10.0030.04012.52
5.0.00.0000.06712.52
4.4.90.0000.03012.52
4.4.80.0030.02712.52
4.4.70.0030.03312.52
4.4.60.0000.02312.52
4.4.50.0000.03712.52
4.4.40.0000.05712.52
4.4.30.0030.03012.52
4.4.20.0030.03312.52
4.4.10.0000.03712.52
4.4.00.0000.03012.52
4.3.110.0030.03712.52
4.3.100.0030.03312.52
4.3.90.0030.03312.52
4.3.80.0000.05312.52
4.3.70.0000.03712.52
4.3.60.0070.03012.52
4.3.50.0030.03712.52
4.3.40.0070.04712.52
4.3.30.0000.03712.52
4.3.20.0030.03312.52
4.3.10.0000.03712.52
4.3.00.0030.03312.52

preferences:
38.75 ms | 400 KiB | 5 Q