Bug #69921 [Opn]: function_exists returns true before function definition

Edit report at https://bugs.php.net/bug.php?id=69921&edit=1 ID: 69921 User updated by: alan at aondra dot com Reported by: alan at aondra dot com -Summary: function_exists fires before function definition +Summary: function_exists returns true before function definition Status: Open Type: Bug Package: Scripting Engine problem Operating System: Any PHP Version: 5.6.10 Block user comment: N Private report: N New Comment: . Previous Comments: ------------------------------------------------------------------------ [2015-06-24 14:57:52] alan at aondra dot com Gave a better summary ------------------------------------------------------------------------ [2015-06-24 14:56:19] alan at aondra dot com Description: ------------ --- From manual page: http://www.php.net/function.function-exists --- The function 'function_exists' does not execute in the order in which the code is evaluated. Not only is this wrong, it allows for the possibility that code could be executed in the incorrect scope. I saw this note on the documentation: "A function name may exist even if the function itself is unusable due to configuration or compiling options (with the image functions being an example)." I looked and found no such configuration or compiling option that would allow for this. Test script: --------------- <?php header('Content-Type: text/plain'); $mystr = 'should not execute'; if(function_exists('myfunc')) { myfunc($mystr); } $mystr = 'execute'; function myfunc($str) { die($str); } myfunc($mystr); Expected result: ---------------- execute Actual result: -------------- should not execute ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69921&edit=1