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[$key]); } } echo PHP_EOL . ' after loop: ' . PHP_EOL; var_dump(key($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)
8.3.60.0150.00618.40
8.3.50.0090.00821.95
8.3.40.0060.00918.89
8.3.30.0070.00719.17
8.3.20.0040.00420.16
8.3.10.0080.00023.70
8.3.00.0060.00319.38
8.2.180.0130.00918.26
8.2.170.0040.01822.96
8.2.160.0070.00720.39
8.2.150.0000.00824.18
8.2.140.0080.00024.66
8.2.130.0020.00526.16
8.2.120.0050.00222.21
8.2.110.0090.00019.34
8.2.100.0000.01117.91
8.2.90.0040.00419.24
8.2.80.0050.00517.97
8.2.70.0050.00317.63
8.2.60.0000.00818.05
8.2.50.0050.00318.10
8.2.40.0050.00319.95
8.2.30.0050.00318.22
8.2.20.0030.00617.95
8.2.10.0000.00718.20
8.2.00.0090.00017.79
8.1.280.0120.00625.92
8.1.270.0050.00323.84
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0090.00022.59
8.1.230.0110.00017.89
8.1.220.0040.00417.74
8.1.210.0060.00318.77
8.1.200.0090.00017.23
8.1.190.0080.00017.10
8.1.180.0060.00318.10
8.1.170.0040.00418.65
8.1.160.0050.00321.95
8.1.150.0040.00418.63
8.1.140.0050.00317.39
8.1.130.0070.00017.84
8.1.120.0020.00517.57
8.1.110.0060.00317.47
8.1.100.0080.00017.38
8.1.90.0040.00417.37
8.1.80.0000.00717.45
8.1.70.0030.00317.44
8.1.60.0040.00417.60
8.1.50.0030.00617.41
8.1.40.0040.00417.58
8.1.30.0040.00417.69
8.1.20.0000.00817.62
8.1.10.0030.00617.59
8.1.00.0040.00417.54
8.0.300.0060.00618.77
8.0.290.0050.00316.63
8.0.280.0040.00418.39
8.0.270.0000.00817.40
8.0.260.0000.00817.21
8.0.250.0000.00716.97
8.0.240.0000.00817.09
8.0.230.0000.00817.07
8.0.220.0000.00716.98
8.0.210.0070.00016.85
8.0.200.0000.00716.96
8.0.190.0000.00817.07
8.0.180.0040.00417.02
8.0.170.0000.00716.84
8.0.160.0000.00716.99
8.0.150.0000.00716.88
8.0.140.0040.00416.96
8.0.130.0030.00513.48
8.0.120.0040.00417.00
8.0.110.0000.00716.90
8.0.100.0040.00417.02
8.0.90.0030.00517.00
8.0.80.0060.01116.87
8.0.70.0050.00216.94
8.0.60.0080.00016.88
8.0.50.0050.00216.79
8.0.30.0110.00917.23
8.0.20.0110.01017.40
8.0.10.0070.00017.00
8.0.00.0070.01016.79
7.4.330.0050.00015.02
7.4.320.0060.00016.53
7.4.300.0000.00616.52
7.4.290.0070.00016.67
7.4.280.0070.00016.58
7.4.270.0040.00416.64
7.4.260.0030.00316.54
7.4.250.0040.00416.47
7.4.240.0070.00016.56
7.4.230.0000.00716.61
7.4.220.0060.01216.50
7.4.210.0070.00816.60
7.4.200.0000.00716.58
7.4.190.0030.00316.73
7.4.160.0030.01316.59
7.4.150.0090.01217.40
7.4.140.0110.00617.86
7.4.130.0100.00916.58
7.4.120.0130.00416.50
7.4.110.0120.00916.45
7.4.100.0170.00416.64
7.4.90.0120.00416.48
7.4.80.0060.01319.39
7.4.70.0120.00416.56
7.4.60.0120.00616.50
7.4.50.0030.00716.46
7.4.40.0060.01116.57
7.4.30.0070.01016.50
7.4.00.0070.00715.06
7.3.330.0060.00313.35
7.3.320.0060.00013.14
7.3.310.0000.00816.48
7.3.300.0070.00016.44
7.3.290.0100.01016.36
7.3.280.0050.01116.32
7.3.270.0120.00617.40
7.3.260.0070.01016.38
7.3.250.0100.00716.50
7.3.240.0160.00016.36
7.3.230.0140.00316.47
7.3.210.0120.01816.49
7.3.200.0030.01919.39
7.3.190.0110.01116.61
7.3.180.0070.01416.42
7.3.170.0070.01016.55
7.3.160.0120.00416.46
7.3.120.0070.00714.97
7.2.330.0000.01716.82
7.2.320.0040.01516.62
7.2.310.0090.01216.71
7.2.300.0040.01416.75
7.2.290.0120.00616.69
7.2.110.0130.01216.75
7.2.60.0100.00316.80
7.2.00.0000.01419.56
7.1.200.0030.01015.66
7.1.100.0070.01018.34
7.1.70.0000.00917.01
7.1.60.0160.01019.46
7.1.50.0070.01416.93
7.1.00.0070.07322.57
7.0.200.0350.00714.96
7.0.140.0030.07322.00
7.0.70.0030.07721.64
7.0.60.0030.08321.71
7.0.50.0070.08722.16
7.0.40.0000.08720.10
7.0.30.0030.09020.05
7.0.20.0030.07720.13
7.0.10.0000.04320.04
7.0.00.0030.06020.18
5.6.280.0070.07021.04
5.6.220.0030.08020.43
5.6.210.0100.07020.70
5.6.200.0000.09021.09
5.6.190.0030.08321.02
5.6.180.0130.07321.12
5.6.170.0030.09020.96
5.6.160.0100.03321.03
5.6.150.0030.04021.14
5.6.140.0000.07721.11
5.6.130.0070.08021.17
5.6.120.0070.07021.10
5.6.110.0030.09020.96
5.6.100.0000.08721.03
5.6.90.0000.07321.06
5.6.80.0030.08020.38
5.6.70.0030.08320.40
5.6.60.0000.08720.42
5.6.50.0100.09020.43
5.6.40.0070.05320.32
5.6.30.0070.07720.39
5.6.20.0070.04020.44
5.6.10.0070.04020.49
5.6.00.0000.08320.30
5.5.360.0100.07320.30
5.5.350.0100.06320.38
5.5.340.0000.07720.92
5.5.330.0100.07320.94
5.5.320.0070.06320.94
5.5.310.0000.08020.86
5.5.300.0130.07320.91
5.5.290.0000.07020.73
5.5.280.0070.06020.84
5.5.270.0000.08020.80
5.5.260.0030.08320.90
5.5.250.0030.07320.73
5.5.240.0170.06720.28
5.5.230.0030.05020.16
5.5.220.0000.08320.27
5.5.210.0000.05720.16
5.5.200.0070.09020.24
5.5.190.0030.04719.99
5.5.180.0030.06320.19
5.5.160.0000.04320.24
5.5.150.0030.08020.12
5.5.140.0000.04020.27
5.5.130.0000.07720.21
5.5.120.0000.05720.14
5.5.110.0070.07720.11
5.5.100.0130.05319.97
5.5.90.0000.05320.17
5.5.80.0100.07020.06
5.5.70.0030.04020.09
5.5.60.0070.05019.97
5.5.50.0130.06720.14
5.5.40.0030.06720.09
5.5.30.0030.07720.07
5.5.20.0070.06720.09
5.5.10.0070.07320.05
5.5.00.0070.06020.10
5.4.450.0070.06719.39
5.4.440.0000.08319.43
5.4.430.0070.05319.36
5.4.420.0070.06019.39
5.4.410.0000.07019.27
5.4.400.0000.08018.82
5.4.390.0030.08718.96
5.4.380.0030.03719.06
5.4.370.0000.05718.78
5.4.360.0000.06019.03
5.4.350.0070.07018.91
5.4.340.0000.04019.04
5.4.320.0030.03718.79
5.4.310.0100.06719.19
5.4.300.0000.08019.09
5.4.290.0070.04719.04
5.4.280.0000.06019.09
5.4.270.0070.06319.07
5.4.260.0030.06019.02
5.4.250.0030.04019.13
5.4.240.0070.03718.98
5.4.230.0000.03719.07
5.4.220.0100.03318.96
5.4.210.0100.07319.11
5.4.200.0030.07719.04
5.4.190.0030.08019.10
5.4.180.0100.07319.03
5.4.170.0000.08018.77
5.4.160.0030.07718.88
5.4.150.0100.06318.77
5.4.140.0030.05716.24
5.4.130.0000.07316.01
5.4.120.0030.06716.21
5.4.110.0030.07316.22
5.4.100.0000.07716.38
5.4.90.0070.05716.42
5.4.80.0000.07016.34
5.4.70.0030.06716.39
5.4.60.0030.05016.29
5.4.50.0000.06716.20
5.4.40.0030.07316.27
5.4.30.0030.07316.18
5.4.20.0000.08016.37
5.4.10.0070.05716.32
5.4.00.0000.04315.68
5.3.290.0030.05014.54
5.3.280.0000.07714.61
5.3.270.0030.07714.48
5.3.260.0000.08014.60
5.3.250.0030.07314.45
5.3.240.0000.06714.48
5.3.230.0100.06014.48
5.3.220.0030.07014.44
5.3.210.0030.07714.59
5.3.200.0030.06714.54
5.3.190.0100.07014.40
5.3.180.0000.06714.58
5.3.170.0000.08014.41
5.3.160.0000.08014.48
5.3.150.0130.06314.52
5.3.140.0070.06314.55
5.3.130.0000.06714.55
5.3.120.0000.08314.54
5.3.110.0030.06014.45
5.3.100.0030.07713.90
5.3.90.0070.07013.93
5.3.80.0000.07014.02
5.3.70.0030.06714.01
5.3.60.0030.06713.99
5.3.50.0070.07013.94
5.3.40.0000.08013.95
5.3.30.0030.06713.94
5.3.20.0070.03313.69
5.3.10.0100.06313.63
5.3.00.0030.04713.62
5.2.170.0000.06311.16
5.2.160.0030.06311.13
5.2.150.0030.07011.14
5.2.140.0030.06011.04
5.2.130.0000.06311.14
5.2.120.0070.04311.16
5.2.110.0030.04011.16
5.2.100.0000.06011.11
5.2.90.0070.03311.11
5.2.80.0030.06011.10
5.2.70.0070.03710.89
5.2.60.0000.06311.05
5.2.50.0030.03711.07
5.2.40.0030.04311.07
5.2.30.0100.04711.06
5.2.20.0000.05310.84
5.2.10.0030.05310.78
5.2.00.0030.05710.78
5.1.60.0000.0409.87
5.1.50.0030.0509.89
5.1.40.0030.0539.83
5.1.30.0100.04310.27
5.1.20.0030.05310.39
5.1.10.0030.05010.13
5.1.00.0000.0439.96
5.0.50.0030.0438.59
5.0.40.0030.0378.59
5.0.30.0030.0578.59
5.0.20.0030.0438.59
5.0.10.0070.0378.59
5.0.00.0030.0608.59
4.4.90.0030.0138.59
4.4.80.0030.0238.59
4.4.70.0030.0278.59
4.4.60.0000.0338.59
4.4.50.0030.0338.59
4.4.40.0000.0538.59
4.4.30.0070.0308.59
4.4.20.0000.0278.59
4.4.10.0000.0378.59
4.4.00.0000.0578.59
4.3.110.0000.0238.59
4.3.100.0000.0278.59
4.3.90.0030.0308.59
4.3.80.0000.0438.59
4.3.70.0030.0278.59
4.3.60.0000.0338.59
4.3.50.0030.0338.59
4.3.40.0000.0408.59
4.3.30.0000.0338.59
4.3.20.0030.0308.59
4.3.10.0030.0338.59
4.3.00.0000.0238.59

preferences:
39.08 ms | 401 KiB | 5 Q