note 56269 added to function.include-once

Dealing with function redefinitions include_once and require_once are very useful if you have a library of common functions. If you try to override with - that is define - an identically named local function however, PHP will halt noting that it cannot redeclare functions. You can allow for this by bracketing (within the include file): function myUsefulFunc($arg1, $arg2) { ... } with if (!function_exists('myUsefulFunc')) { function myUsefulFunc($arg1, $arg2) { ... }} Top level functions (ie. those not defined within other functions or dependent on code running) in the local file are always parsed first, so http://php.net/function_exists within the included/required file is safe - it doesn't matter where the include statements are in the local code. Csaba Gabor from Vienna ---- Manual Page -- http://www.php.net/manual/en/function.include-once.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+56269 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+56269&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+56269&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+56269&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+56269&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+56269&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+56269&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+56269&report=yes Search -- http://master.php.net/manage/user-notes.php