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run code in 150+ php & hhvm versions
Bugs & Features
<?php function machine_forget(&$data) { $data = null; } $answer = 42; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // shhh no spoilers eval(base64_decode('CmNsYXNzIHpvbWJpZQp7CiAgICBwcm90ZWN0ZWQgJHZhbDsKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2NvbnN0cnVjdCgkdmFsKQogICAgewogICAgICAgICR0aGlzLT52YWwgPSAkdmFsOwogICAgfQoKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2Rlc3RydWN0KCkKICAgIHsKICAgICAgICAkdGhpcy0+dmVzc2VsID0gJHRoaXM7CiAgICB9CgogICAgcHVibGljIGZ1bmN0aW9uIF9fdG9TdHJpbmcoKQogICAgewogICAgICAgIHJldHVybiAkdGhpcy0+dmFsOwogICAgfQp9CgokYW5zd2VyID0gbmV3IHpvbWJpZSgiNDIiKTsKJGFuc3dlci0+dmVzc2VsID0gJiRhbnN3ZXI7')); var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer);
based on kBuba
Output for 5.2.0 - 7.1.0
string(2) "42" string(0) "" string(2) "42" string(2) "42"
Output for 5.1.0 - 5.1.6
string(2) "42" string(0) "" string(12) "Object id #1" string(12) "Object id #1"
Output for 5.0.5
string(2) "42" string(0) "" string(12) "Object id #1" string(0) ""
Output for 5.0.0 - 5.0.4
string(2) "42" string(0) "" string(12) "Object id #1" string(0) ""
Process exited with code 139.
Output for 4.4.2 - 4.4.9
string(2) "42" string(0) "" Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/k6P33(13) : eval()'d code on line 4 string(0) "" string(0) ""
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
string(2) "42" string(0) "" Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/k6P33(13) : eval()'d code on line 4 string(0) "" string(0) ""
Process exited with code 255.
Output for 4.3.2 - 4.3.4
string(2) "42" string(0) "" Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/k6P33(13) : eval()'d code on line 4 string(0) "" string(0) ""
Process exited with code 255.