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<?php $_POST['one'] = '1 rabbit'; $_POST['two'] = '2 rabbit'; $_POST['three'] = '3 rabbit'; foreach ($_POST as $var => $value) { if (isset($$var)) { continue; } var_dump($var); } var_dump($one); var_dump($two); var_dump($three);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
string(3) "one" string(3) "two" string(5) "three" Warning: Undefined variable $one in /in/kIDVb on line 13 NULL Warning: Undefined variable $two in /in/kIDVb on line 14 NULL Warning: Undefined variable $three in /in/kIDVb on line 15 NULL
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(3) "one" string(3) "two" string(5) "three" Warning: Undefined variable $one in /in/kIDVb on line 13 NULL Warning: Undefined variable $two in /in/kIDVb on line 14 NULL Warning: Undefined variable $three in /in/kIDVb on line 15 NULL
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
string(3) "one" string(3) "two" string(5) "three" Notice: Undefined variable: one in /in/kIDVb on line 13 NULL Notice: Undefined variable: two in /in/kIDVb on line 14 NULL Notice: Undefined variable: three in /in/kIDVb on line 15 NULL
Output for 7.3.32 - 7.3.33
string(3) "one" string(3) "two" string(5) "three" NULL NULL NULL
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157.19 ms | 401 KiB | 173 Q