3v4l.org

run code in 300+ PHP versions simultaneously
<?php function &machine_forget(&$data) { $copy = $data; $data = null; return &$copy; } echo "normal\n"; $answer = 42; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); echo "\n"; echo "magic\n"; // shhh no spoilers eval(base64_decode('CmNsYXNzIHpvbWJpZQp7CiAgICBwcm90ZWN0ZWQgJHZhbDsKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2NvbnN0cnVjdCgkdmFsKQogICAgewogICAgICAgICR0aGlzLT52YWwgPSAkdmFsOwogICAgfQoKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2Rlc3RydWN0KCkKICAgIHsKICAgICAgICAkdGhpcy0+dmVzc2VsID0gJHRoaXM7CiAgICB9CgogICAgcHVibGljIGZ1bmN0aW9uIF9fdG9TdHJpbmcoKQogICAgewogICAgICAgIHJldHVybiAkdGhpcy0+dmFsOwogICAgfQp9CgokYW5zd2VyID0gbmV3IHpvbWJpZSgiNDIiKTsKJGFuc3dlci0+dmVzc2VsID0gJiRhbnN3ZXI7')); var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // DID NOT FORGET echo "\n"; echo "normal again\n"; $answer = 42; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // FORGOT

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)
5.4.320.0070.03512.52
5.4.310.0050.03812.52
5.4.300.0090.03312.52
5.4.290.0070.03912.51
5.4.280.0080.03512.41
5.4.270.0090.03912.41
5.4.260.0050.03712.41
5.4.250.0070.03512.41
5.4.240.0020.03812.41
5.4.230.0040.03712.40
5.4.220.0060.05112.40
5.4.210.0100.04012.40
5.4.200.0030.04312.40
5.4.190.0090.03812.40
5.4.180.0050.03512.39
5.4.170.0040.03712.41
5.4.160.0070.03412.40
5.4.150.0060.03612.39
5.4.140.0050.04112.09
5.4.130.0050.03812.07
5.4.120.0050.03512.04
5.4.110.0050.03612.03
5.4.100.0030.03512.03
5.4.90.0060.03912.03
5.4.80.0050.03612.03
5.4.70.0040.03512.03
5.4.60.0070.03212.03
5.4.50.0060.03512.03
5.4.40.0060.03512.02
5.4.30.0040.03612.01
5.4.20.0080.03312.01
5.4.10.0060.03412.01
5.4.00.0030.03811.51
5.3.290.0040.04012.80
5.3.280.0060.04512.71
5.3.270.0040.04112.72
5.3.260.0030.04212.71
5.3.250.0060.03712.72
5.3.240.0040.03812.72
5.3.230.0040.04112.71
5.3.220.0060.03612.68
5.3.210.0060.04112.68
5.3.200.0040.03812.68
5.3.190.0070.03612.68
5.3.180.0090.03312.68
5.3.170.0070.03412.67
5.3.160.0030.03812.67
5.3.150.0080.03412.67
5.3.140.0060.03612.66
5.3.130.0060.03812.66
5.3.120.0050.03912.66
5.3.110.0070.03612.66
5.3.100.0050.04212.13
5.3.90.0050.03612.11
5.3.80.0070.03512.09
5.3.70.0050.03812.09
5.3.60.0060.03612.09
5.3.50.0060.03512.02
5.3.40.0050.03712.02
5.3.30.0070.03311.98
5.3.20.0040.03711.76
5.3.10.0070.03311.73
5.3.00.0050.03611.71
5.2.170.0060.0299.21
5.2.160.0040.0309.21
5.2.150.0050.0309.21
5.2.140.0040.0319.22
5.2.130.0050.0319.17
5.2.120.0050.0279.18
5.2.110.0040.0299.18
5.2.100.0040.0299.18
5.2.90.0020.0319.18
5.2.80.0060.0349.18
5.2.70.0060.0279.17
5.2.60.0030.0319.12
5.2.50.0040.0319.09
5.2.40.0070.0269.07
5.2.30.0060.0289.05
5.2.20.0030.0299.04
5.2.10.0040.0288.95
5.2.00.0040.0298.80
5.1.60.0020.0258.08
5.1.50.0000.0288.08
5.1.40.0050.0228.07
5.1.30.0060.0238.42
5.1.20.0050.0258.44
5.1.10.0060.0258.16
5.1.00.0080.0268.16
5.0.50.0060.0196.64
5.0.40.0030.0196.50
5.0.30.0040.0306.31
5.0.20.0020.0206.28
5.0.10.0050.0186.27
5.0.00.0050.0296.26
4.4.90.0030.0154.78
4.4.80.0010.0174.75
4.4.70.0030.0154.76
4.4.60.0060.0124.75
4.4.50.0020.0174.77
4.4.40.0050.0244.71
4.4.30.0050.0134.76
4.4.20.0020.0164.85
4.4.10.0020.0154.84
4.4.00.0010.0254.76
4.3.110.0030.0154.67
4.3.100.0020.0154.66
4.3.90.0020.0154.63
4.3.80.0040.0224.58
4.3.70.0020.0154.63
4.3.60.0040.0134.63
4.3.50.0020.0184.63
4.3.40.0010.0254.54
4.3.30.0030.0193.30
4.3.20.0050.0193.27
4.3.10.0030.0203.25
4.3.00.0070.01319.45

preferences:
150.67 ms | 1394 KiB | 7 Q