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 ($key == 1) { echo PHP_EOL . ' unsetting second element.... ' . PHP_EOL; unset($array[$key]); } } var_dump($array); echo PHP_EOL . ' after loop: ' . PHP_EOL; var_dump(key($array)); var_dump(current($array)); reset($array); echo PHP_EOL . ' after reset: ' . PHP_EOL; var_dump(key($array)); var_dump(current($array)); end($array); echo PHP_EOL . ' after end: ' . PHP_EOL; var_dump(key($array)); var_dump(current($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)
8.3.70.0110.00418.43
8.3.60.0090.00616.75
8.3.50.0160.00716.66
8.3.40.0090.00618.93
8.3.30.0120.00318.93
8.3.20.0080.00018.90
8.3.10.0000.00820.61
8.3.00.0060.00319.38
8.2.180.0110.00716.38
8.2.170.0120.00622.96
8.2.160.0070.00722.30
8.2.150.0080.00024.18
8.2.140.0080.00024.66
8.2.130.0090.00026.16
8.2.120.0050.00319.95
8.2.110.0030.00721.10
8.2.100.0090.00317.84
8.2.90.0090.00319.21
8.2.80.0050.00317.97
8.2.70.0040.00417.63
8.2.60.0040.00418.04
8.2.50.0040.00418.19
8.2.40.0000.00720.61
8.2.30.0040.00419.32
8.2.20.0030.00517.85
8.2.10.0050.00317.70
8.2.00.0000.00717.87
8.1.280.0110.00425.92
8.1.270.0040.00424.66
8.1.260.0070.00026.35
8.1.250.0040.00428.09
8.1.240.0030.00622.74
8.1.230.0000.01219.04
8.1.220.0040.00417.79
8.1.210.0030.00518.77
8.1.200.0060.00317.23
8.1.190.0060.00517.25
8.1.180.0000.00718.10
8.1.170.0040.00418.56
8.1.160.0030.00518.76
8.1.150.0040.00420.32
8.1.140.0030.00517.47
8.1.130.0000.00717.83
8.1.120.0080.00017.37
8.1.110.0000.00717.49
8.1.100.0000.00717.35
8.1.90.0000.00717.49
8.1.80.0000.00717.45
8.1.70.0050.00317.48
8.1.60.0080.00017.52
8.1.50.0030.00517.46
8.1.40.0050.00317.56
8.1.30.0000.00817.59
8.1.20.0040.00417.56
8.1.10.0030.00517.63
8.1.00.0040.00417.41
8.0.300.0070.00018.77
8.0.290.0080.00016.75
8.0.280.0000.00718.51
8.0.270.0000.00717.17
8.0.260.0000.00718.37
8.0.250.0040.00417.05
8.0.240.0000.00817.02
8.0.230.0070.00016.99
8.0.220.0040.00416.97
8.0.210.0000.00716.95
8.0.200.0060.00016.91
8.0.190.0000.00716.92
8.0.180.0040.00416.96
8.0.170.0080.00016.96
8.0.160.0000.00716.95
8.0.150.0030.00716.97
8.0.140.0080.00416.93
8.0.130.0060.00013.35
8.0.120.0040.00416.98
8.0.110.0030.00617.03
8.0.100.0050.00316.94
8.0.90.0050.00316.91
8.0.80.0070.01316.89
8.0.70.0050.00216.86
8.0.60.0040.00417.00
8.0.50.0070.00016.83
8.0.30.0100.00917.04
8.0.20.0150.00817.22
8.0.10.0060.00317.20
8.0.00.0100.00716.78
7.4.330.0000.00613.01
7.4.320.0090.00016.63
7.4.300.0060.00016.46
7.4.290.0030.00316.50
7.4.280.0000.00916.44
7.4.270.0040.00416.62
7.4.260.0000.00513.31
7.4.250.0090.00016.55
7.4.240.0040.00416.58
7.4.230.0070.00016.43
7.4.220.0130.00616.52
7.4.210.0050.00916.64
7.4.200.0050.00216.71
7.4.190.0030.00316.70
7.4.160.0120.00316.22
7.4.150.0040.01416.55
7.4.140.0100.01016.54
7.4.130.0130.00516.49
7.4.120.0070.01016.56
7.4.110.0090.00916.58
7.4.100.0030.01516.55
7.4.90.0090.00916.34
7.4.80.0090.00916.52
7.4.70.0120.00816.53
7.4.60.0070.01716.61
7.4.50.0000.00416.45
7.4.40.0050.00816.35
7.4.30.0070.01016.67
7.4.00.0060.00615.08
7.3.330.0000.00613.33
7.3.320.0030.00313.17
7.3.310.0030.00616.46
7.3.300.0000.00716.40
7.3.290.0040.01516.37
7.3.280.0130.00816.33
7.3.270.0180.00416.47
7.3.260.0090.01116.39
7.3.250.0080.01116.51
7.3.240.0060.01116.58
7.3.230.0040.01316.51
7.3.210.0100.01016.56
7.3.200.0050.01819.39
7.3.190.0160.00716.45
7.3.180.0150.00816.41
7.3.170.0060.00916.40
7.3.160.0120.00416.66
7.3.120.0070.01015.02
7.3.10.0070.00416.70
7.3.00.0060.00916.48
7.2.330.0130.00616.77
7.2.320.0060.01216.62
7.2.310.0070.01416.75
7.2.300.0100.00716.66
7.2.290.0060.01216.85
7.2.130.0070.00717.04
7.2.120.0090.00317.02
7.2.110.0090.00316.94
7.2.100.0070.00716.96
7.2.90.0090.00616.86
7.2.80.0100.00316.78
7.2.70.0000.00916.97
7.2.60.0090.00617.00
7.2.50.0060.00917.10
7.2.40.0120.00317.11
7.2.30.0030.01316.93
7.2.20.0040.01216.82
7.2.10.0080.00416.79
7.2.00.0030.01018.36
7.1.250.0040.00715.51
7.1.200.0090.00315.84
7.1.100.0060.00618.21
7.1.70.0030.00616.87
7.1.60.0110.01419.40
7.1.50.0100.00716.79
7.1.00.0000.06322.48
7.0.200.0030.00514.89
7.0.140.0000.07722.02
7.0.120.0000.07722.05
7.0.60.0100.06719.88
7.0.50.0030.04317.83
7.0.40.0030.05320.04
7.0.30.0270.05020.20
7.0.20.0400.06720.33
7.0.10.0200.04320.20
7.0.00.0100.06020.09
5.6.280.0100.06720.99
5.6.210.0070.08320.63
5.6.200.0070.08718.24
5.6.190.0100.07020.63
5.6.180.0470.03720.56
5.6.170.0400.07020.47
5.6.160.0100.04320.53
5.6.150.0030.04018.16
5.6.140.0070.05318.22
5.6.130.0070.07018.12
5.6.120.0000.08321.02
5.6.110.0200.06321.14
5.6.100.0170.07020.98
5.6.90.0000.08320.96
5.6.80.0070.04320.29
5.6.70.4500.03320.48
5.5.350.0370.07020.41
5.5.340.0070.08318.00
5.5.330.0030.04020.19
5.5.320.0130.04720.40
5.5.310.0330.06720.27
5.5.300.0100.06018.02
5.5.290.0070.08717.98
5.5.280.0070.07020.69
5.5.270.0100.03720.88
5.5.260.0030.07020.98
5.5.250.0100.07720.62
5.5.240.0030.07020.36
5.4.450.0100.08019.14
5.4.440.0170.07319.11
5.4.430.0070.08019.24
5.4.420.0000.05719.50
5.4.410.0070.07719.27
5.4.400.0030.08019.14
5.4.390.0030.08019.18
5.4.380.0100.04319.08
5.4.370.0100.06318.91
5.4.360.0130.07319.14
5.4.350.0100.06019.08
5.4.340.0000.07719.08
5.4.320.0030.04718.79
5.4.310.0100.04718.79
5.4.300.0070.06318.93
5.4.290.0070.07719.15
5.4.280.0030.04019.11
5.4.270.0000.06719.14
5.4.260.0070.08019.13
5.4.250.0070.04318.81
5.4.240.0100.06319.13
5.4.230.0130.05019.15
5.4.220.0200.05318.78
5.4.210.0000.04319.08
5.4.200.0100.07319.19
5.4.190.0000.05018.99
5.4.180.0070.04318.90
5.4.170.0030.04719.16
5.4.160.0030.08319.11
5.4.150.0070.07719.06
5.4.140.0100.07316.32
5.4.130.0200.05716.47
5.4.120.0070.07316.24
5.4.110.0130.06316.32
5.4.100.0100.07316.33
5.4.90.0070.06016.44
5.4.80.0100.04716.24
5.4.70.0170.06016.34
5.4.60.0030.07316.21
5.4.50.0100.04316.32
5.4.40.0030.03716.13
5.4.30.0070.07016.28
5.4.20.0030.06316.29
5.4.10.0100.06016.34
5.4.00.0030.07015.93
5.3.290.0030.04314.62
5.3.280.0100.05314.54
5.3.270.0100.07314.71
5.3.260.0130.06314.55
5.3.250.0070.05314.73
5.3.240.0070.07714.55
5.3.230.0170.06714.64
5.3.220.0070.05314.37
5.3.210.0100.07314.53
5.3.200.0100.07314.52
5.3.190.0070.06314.52
5.3.180.0030.05314.50
5.3.170.0100.07014.51
5.3.160.0100.06314.46
5.3.150.0070.08014.50
5.3.140.0070.04314.46
5.3.130.0070.05714.64
5.3.120.0070.06014.64
5.3.110.0070.07714.49
5.3.100.0030.07013.95
5.3.90.0130.07313.96
5.3.80.0130.07013.96
5.3.70.0100.03714.12
5.3.60.0170.06314.11
5.3.50.0130.04013.78
5.3.40.0070.07014.05
5.3.30.0100.04313.84
5.3.20.0100.04013.65
5.3.10.0030.05713.63
5.3.00.0130.06313.62
5.2.170.0070.04011.15
5.2.160.0000.06311.02
5.2.150.0100.05711.15
5.2.140.0000.06311.05
5.2.130.0100.05711.20
5.2.120.0070.06311.09
5.2.110.0070.06311.08
5.2.100.0030.03710.97
5.2.90.0030.05011.27
5.2.80.0000.03311.04
5.2.70.0100.06011.10
5.2.60.0030.06711.00
5.2.50.0000.03311.19
5.2.40.0100.05311.02
5.2.30.0030.04010.97
5.2.20.0130.05310.95
5.2.10.0030.05710.92
5.2.00.0070.07010.59
5.1.60.0070.0579.98
5.1.50.0070.04710.02
5.1.40.0070.04710.01
5.1.30.0070.05310.34
5.1.20.0100.05010.37
5.1.10.0100.05310.14
5.1.00.0070.04710.12
5.0.50.0030.0278.57
5.0.40.0100.0338.48
5.0.30.0030.0638.26
5.0.20.0000.0378.26
5.0.10.0000.0378.26
5.0.00.0000.0608.26
4.4.90.0000.0178.26
4.4.80.0000.0378.26
4.4.70.0000.0378.26
4.4.60.0000.0408.26
4.4.50.0030.0338.26
4.4.40.0030.0578.26
4.4.30.0000.0408.26
4.4.20.0000.0308.26
4.4.10.0070.0138.26
4.4.00.0000.0378.26
4.3.110.0000.0378.26
4.3.100.0000.0338.26
4.3.90.0000.0278.26
4.3.80.0000.0378.26
4.3.70.0000.0238.26
4.3.60.0070.0238.26
4.3.50.0000.0408.26
4.3.40.0000.0378.26
4.3.30.0000.0308.26
4.3.20.0000.0278.26
4.3.10.0000.0308.26
4.3.00.0000.0308.26

preferences:
48.62 ms | 401 KiB | 5 Q