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($array)); var_dump(current($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)
8.3.60.0170.00316.88
8.3.50.0090.00617.71
8.3.40.0170.00318.80
8.3.30.0090.00918.83
8.3.20.0080.00018.90
8.3.10.0040.00420.51
8.3.00.0060.00919.51
8.2.180.0140.00716.50
8.2.170.0140.00722.96
8.2.160.0100.00321.19
8.2.150.0050.00324.18
8.2.140.0100.00724.66
8.2.130.0080.00026.16
8.2.120.0000.00819.48
8.2.110.0060.00321.00
8.2.100.0110.00017.72
8.2.90.0030.00621.21
8.2.80.0000.00719.28
8.2.70.0040.00817.38
8.2.60.0000.00917.93
8.2.50.0000.00818.07
8.2.40.0030.00917.90
8.2.30.0000.00718.14
8.2.20.0040.00417.79
8.2.10.0040.00417.81
8.2.00.0000.00817.88
8.1.280.0160.00725.92
8.1.270.0040.00424.66
8.1.260.0000.00826.35
8.1.250.0070.00028.09
8.1.240.0060.00322.46
8.1.230.0070.00320.97
8.1.220.0080.00017.74
8.1.210.0060.00320.65
8.1.200.0060.00317.35
8.1.190.0080.00017.53
8.1.180.0000.00818.10
8.1.170.0060.00318.72
8.1.160.0050.00218.84
8.1.150.0000.00718.50
8.1.140.0090.00017.46
8.1.130.0070.00017.78
8.1.120.0040.00417.49
8.1.110.0080.00017.43
8.1.100.0030.00517.42
8.1.90.0040.00417.38
8.1.80.0000.00717.36
8.1.70.0080.00017.43
8.1.60.0000.00817.63
8.1.50.0040.00417.40
8.1.40.0000.00817.58
8.1.30.0000.00817.62
8.1.20.0040.00417.71
8.1.10.0000.00717.59
8.1.00.0040.00717.46
8.0.300.0040.00419.89
8.0.290.0000.00716.75
8.0.280.0030.00318.33
8.0.270.0030.00317.32
8.0.260.0030.00316.81
8.0.250.0020.00516.93
8.0.240.0060.00317.09
8.0.230.0040.00416.98
8.0.220.0040.00416.96
8.0.210.0030.00316.81
8.0.200.0030.00316.96
8.0.190.0030.00516.88
8.0.180.0000.00717.00
8.0.170.0000.00917.00
8.0.160.0030.00317.07
8.0.150.0090.00016.89
8.0.140.0080.00016.91
8.0.130.0030.00313.44
8.0.120.0000.00716.88
8.0.110.0040.00416.84
8.0.100.0050.00316.79
8.0.90.0000.00817.04
8.0.80.0090.00616.96
8.0.70.0040.00416.97
8.0.60.0000.00716.84
8.0.50.0040.00416.79
8.0.30.0110.00817.16
8.0.20.0120.01017.21
8.0.10.0000.00816.93
8.0.00.0110.01216.72
7.4.330.0000.00512.93
7.4.320.0040.00416.55
7.4.300.0000.00716.52
7.4.290.0000.00616.51
7.4.280.0000.00716.44
7.4.270.0030.00316.47
7.4.260.0060.00013.23
7.4.250.0030.00616.50
7.4.240.0040.00416.61
7.4.230.0000.00716.69
7.4.220.0130.01016.51
7.4.210.0050.00916.54
7.4.200.0030.00316.71
7.4.190.0040.00416.54
7.4.160.0080.00816.56
7.4.150.0090.00916.70
7.4.140.0090.00816.46
7.4.130.0110.00716.55
7.4.120.0100.00816.55
7.4.110.0150.00916.39
7.4.100.0100.00716.70
7.4.90.0200.00316.45
7.4.80.0060.01019.39
7.4.70.0060.01116.58
7.4.60.0080.01416.59
7.4.50.0030.00616.25
7.4.40.0000.01416.46
7.4.30.0140.00716.39
7.4.10.0050.01214.97
7.4.00.0100.00614.98
7.3.330.0030.00313.24
7.3.320.0030.00313.15
7.3.310.0030.00316.46
7.3.300.0070.00016.42
7.3.290.0110.00316.39
7.3.280.0110.00616.31
7.3.270.0060.01216.73
7.3.260.0110.00616.57
7.3.250.0110.00716.49
7.3.240.0120.00916.60
7.3.230.0100.01316.43
7.3.210.0100.00616.50
7.3.200.0170.00016.61
7.3.190.0120.00616.51
7.3.180.0110.00816.45
7.3.170.0080.00816.33
7.3.160.0130.00316.56
7.3.130.0080.00814.84
7.3.120.0070.01014.91
7.3.110.0090.01014.87
7.3.100.0070.00914.80
7.3.90.0050.00814.88
7.3.80.0030.00715.04
7.3.70.0060.00914.87
7.3.60.0000.01214.93
7.3.50.0090.00714.80
7.3.40.0020.01014.95
7.3.30.0080.00314.83
7.3.20.0090.00516.79
7.3.10.0110.00516.62
7.3.00.0070.00516.64
7.2.330.0060.01216.75
7.2.320.0090.00916.84
7.2.310.0130.01016.75
7.2.300.0130.00516.58
7.2.290.0140.00316.61
7.2.260.0050.01315.07
7.2.250.0080.01015.17
7.2.240.0090.00615.16
7.2.230.0100.00615.07
7.2.220.0080.00615.08
7.2.210.0030.00815.30
7.2.200.0030.00615.06
7.2.190.0030.01014.95
7.2.180.0080.00615.13
7.2.170.0050.00815.02
7.2.160.0030.01315.13
7.2.150.0090.00516.80
7.2.140.0050.00917.08
7.2.130.0070.00416.99
7.2.120.0060.00716.85
7.2.110.0070.00816.88
7.2.100.0070.00716.98
7.2.90.0060.00616.96
7.2.80.0060.00716.90
7.2.70.0080.00616.95
7.2.60.0050.00916.97
7.2.50.0060.00716.99
7.2.40.0070.00816.92
7.2.30.0020.00916.83
7.2.20.0080.00816.92
7.2.10.0070.00716.89
7.2.00.0050.00717.31
7.1.330.0110.00415.62
7.1.320.0100.00715.86
7.1.310.0040.00815.72
7.1.300.0120.00315.74
7.1.290.0070.00715.68
7.1.280.0090.00415.41
7.1.270.0100.00515.74
7.1.260.0060.00715.92
7.1.250.0050.00815.79
7.1.240.0060.00515.84
7.1.230.0050.00715.79
7.1.220.0040.00915.94
7.1.210.0040.00815.81
7.1.200.0050.00715.86
7.1.190.0060.00615.76
7.1.180.0030.00815.79
7.1.170.0050.00815.82
7.1.160.0020.01015.88
7.1.150.0010.01115.69
7.1.140.0030.01015.86
7.1.130.0050.00915.75
7.1.120.0060.00615.93
7.1.110.0080.00515.92
7.1.100.0080.00716.49
7.1.90.0020.00815.86
7.1.80.0030.01015.76
7.1.70.0080.00416.11
7.1.60.0050.01416.89
7.1.50.0050.01016.24
7.1.40.0050.00715.78
7.1.30.0120.00315.65
7.1.20.0050.01015.83
7.1.10.0030.00915.87
7.1.00.0050.02818.05
7.0.330.0050.01115.37
7.0.320.0050.00915.48
7.0.310.0070.00315.41
7.0.300.0070.00615.44
7.0.290.0050.00815.44
7.0.280.0080.00315.41
7.0.270.0090.00515.46
7.0.260.0040.00915.33
7.0.250.0070.01015.31
7.0.240.0070.00515.50
7.0.230.0070.00415.51
7.0.220.0070.00715.30
7.0.210.0020.01015.27
7.0.200.0050.00715.96
7.0.190.0000.01315.42
7.0.180.0080.00615.44
7.0.170.0070.00615.42
7.0.160.0070.00515.44
7.0.150.0050.00815.36
7.0.140.0080.02617.68
7.0.130.0060.00815.28
7.0.120.0020.03117.66
7.0.110.0020.01015.51
7.0.100.0070.00515.39
7.0.90.0090.00315.36
7.0.80.0030.01015.30
7.0.70.0020.01015.37
7.0.60.0060.03116.87
7.0.50.0040.02116.21
7.0.40.0040.03315.70
7.0.30.0100.01815.77
7.0.20.0110.02815.72
7.0.10.0070.03115.61
7.0.00.0030.02915.65
5.6.400.0060.00714.65
5.6.390.0040.00914.68
5.6.380.0050.00714.39
5.6.370.0030.00914.44
5.6.360.0050.00614.34
5.6.350.0000.01014.28
5.6.340.0060.01114.54
5.6.330.0090.00114.14
5.6.320.0040.01114.66
5.6.310.0090.00414.71
5.6.300.0030.00814.65
5.6.290.0050.00814.64
5.6.280.0030.02816.67
5.6.270.0030.00714.29
5.6.260.0030.00614.52
5.6.250.0070.00814.53
5.6.240.0100.00514.57
5.6.230.0020.01514.50
5.6.220.0020.01314.43
5.6.210.0050.03416.51
5.6.200.0030.02515.74
5.6.190.0050.01816.51
5.6.180.0050.02416.41
5.6.170.0060.02216.46
5.6.160.0070.03316.40
5.6.150.0040.02415.76
5.6.140.0060.03015.66
5.6.130.0040.03115.74
5.6.120.0060.02216.58
5.6.110.0080.01716.56
5.6.100.0050.03516.76
5.6.90.0080.01516.71
5.6.80.0050.01916.39
5.6.70.0040.01114.41
5.6.60.0060.00914.40
5.6.50.0030.00914.41
5.6.40.0040.00714.21
5.6.30.0050.01014.24
5.6.20.0020.01014.50
5.6.10.0100.00414.55
5.6.00.0030.01114.24
5.5.380.0020.01014.50
5.5.370.0030.01014.48
5.5.360.0060.00714.47
5.5.350.0030.03516.41
5.5.340.0080.02715.66
5.5.330.0050.02916.31
5.5.320.0110.01816.37
5.5.310.0170.02716.47
5.5.300.0070.02715.58
5.5.290.0020.02215.71
5.5.280.0050.03316.56
5.5.270.0030.02516.58
5.5.260.0050.02716.63
5.5.250.0050.01816.49
5.5.240.0150.02916.22
5.5.230.0090.00614.26
5.5.220.0050.00714.44
5.5.210.0020.01214.17
5.5.200.0070.00714.32
5.5.190.0080.00814.31
5.5.180.0080.00514.40
5.5.170.0050.00714.37
5.5.160.0070.00614.36
5.5.150.0090.00614.40
5.5.140.0050.00914.33
5.5.130.0060.00814.50
5.5.120.0050.01014.39
5.5.110.0080.00714.19
5.5.100.0040.00814.27
5.5.90.0050.00614.21
5.5.80.0050.01114.09
5.5.70.0050.01114.17
5.5.60.0040.00914.35
5.5.50.0040.00814.30
5.5.40.0050.00714.24
5.5.30.0110.00514.21
5.5.20.0050.00814.48
5.5.10.0070.00714.15
5.5.00.0050.01014.18
5.4.450.0050.02214.34
5.4.440.0040.02514.39
5.4.430.0060.02314.46
5.4.420.0050.02114.45
5.4.410.0030.02714.40
5.4.400.0030.03114.35
5.4.390.0020.01814.33
5.4.380.0060.02914.24
5.4.370.0070.01614.36
5.4.360.0030.02514.28
5.4.350.0010.01714.35
5.4.340.0010.02114.35
5.4.330.0000.00811.96
5.4.320.0030.02914.23
5.4.310.0060.02614.27
5.4.300.0050.02414.30
5.4.290.0100.02514.23
5.4.280.0080.02614.33
5.4.270.0050.03014.23
5.4.260.0070.02614.36
5.4.250.0030.02614.33
5.4.240.0030.03114.36
5.4.230.0050.01814.36
5.4.220.0040.02914.36
5.4.210.0050.01914.34
5.4.200.0030.02014.34
5.4.190.0050.01714.35
5.4.180.0020.02014.34
5.4.170.0060.01814.30
5.4.160.0020.02414.36
5.4.150.0050.02914.34
5.4.140.0050.02813.45
5.4.130.0070.01713.42
5.4.120.0080.02113.45
5.4.110.0040.02713.44
5.4.100.0020.02913.44
5.4.90.0030.02213.42
5.4.80.0050.02513.38
5.4.70.0070.02513.39
5.4.60.0060.02513.40
5.4.50.0050.01913.37
5.4.40.0060.02713.40
5.4.30.0050.02613.39
5.4.20.0040.02613.37
5.4.10.0050.02013.38
5.4.00.0060.02713.18
5.3.290.0040.02312.84
5.3.280.0070.01612.83
5.3.270.0060.01712.84
5.3.260.0010.02712.85
5.3.250.0020.02712.83
5.3.240.0050.02812.81
5.3.230.0040.03112.82
5.3.220.0020.02012.86
5.3.210.0050.02112.82
5.3.200.0030.01812.77
5.3.190.0060.02712.82
5.3.180.0010.01912.82
5.3.170.0060.02812.82
5.3.160.0030.01912.77
5.3.150.0060.02312.83
5.3.140.0040.02612.81
5.3.130.0070.02612.77
5.3.120.0030.02612.83
5.3.110.0050.01612.83
5.3.100.0000.02412.63
5.3.90.0040.02212.62
5.3.80.0020.02412.62
5.3.70.0030.03012.64
5.3.60.0020.02412.62
5.3.50.0100.01912.62
5.3.40.0070.02212.56
5.3.30.0040.01912.54
5.3.20.0050.02912.54
5.3.10.0050.01812.47
5.3.00.0060.01612.51
5.2.170.0030.03711.24
5.2.160.0030.05710.98
5.2.150.0070.02711.06
5.2.140.0000.06711.06
5.2.130.0070.05011.11
5.2.120.0070.06011.20
5.2.110.0070.05011.29
5.2.100.0070.03011.29
5.2.90.0030.03011.07
5.2.80.0070.06311.08
5.2.70.0000.03310.97
5.2.60.0100.06011.00
5.2.50.0030.05710.97
5.2.40.0000.03710.94
5.2.30.0030.03010.89
5.2.20.0000.06310.94
5.2.10.0030.06010.88
5.2.00.0030.06710.73
5.1.60.0030.0279.91
5.1.50.0030.0509.96
5.1.40.0030.05010.05
5.1.30.0030.03310.38
5.1.20.0000.02710.36
5.1.10.0000.02710.09
5.1.00.0000.03010.05
5.0.50.0030.0238.47
5.0.40.0030.0178.38
5.0.30.0000.0308.26
5.0.20.0030.0178.36
5.0.10.0030.0178.18
5.0.00.0000.0308.15
4.4.90.0000.0177.89
4.4.80.0100.0307.89
4.4.70.0030.0337.89
4.4.60.0000.0207.89
4.4.50.0030.0377.89
4.4.40.0030.0237.89
4.4.30.0000.0177.89
4.4.20.0000.0177.89
4.4.10.0070.0107.89
4.4.00.0000.0237.89
4.3.110.0000.0177.89
4.3.100.0030.0137.89
4.3.90.0030.0137.89
4.3.80.0000.0277.89
4.3.70.0000.0277.89
4.3.60.0000.0137.89
4.3.50.0000.0177.89
4.3.40.0030.0207.89
4.3.30.0030.0137.89
4.3.20.0030.0137.89
4.3.10.0000.0137.89
4.3.00.0000.0177.89

preferences:
45.22 ms | 401 KiB | 5 Q