note 89861 added to function.function-exists

Regarding neelam_ab2003 at yahoo dot co dot in's comment about nested functions. Nested functions _do_ exist once the functions that contain them have been called and the code that defines them is evaluated; until then, they don't. <?php function A(){} function B(){ function C(){ function D(){} } } IsFunctionExist('A'); IsFunctionExist('B'); IsFunctionExist('C'); IsFunctionExist('D'); B(); echo '<br>'; IsFunctionExist('A'); IsFunctionExist('B'); IsFunctionExist('C'); IsFunctionExist('D'); C(); echo '<br>'; IsFunctionExist('A'); IsFunctionExist('B'); IsFunctionExist('C'); IsFunctionExist('D'); function IsFunctionExist($funcName){ echo function_exists($funcName)?" $funcName exists <br>":" $funcName doesn't exist <br>"; } /*O U T P U T A exists B exists C doesn't exist D doesn't exist A exists B exists C exists D doesn't exist A exists B exists C exists D exists */ ?> This makes sense for other functions that are defined at runtime. <?php if(true) { function A(){} } else { function B(){} } IsFunctionExist('A'); IsFunctionExist('B'); /* A exists B doesn't exist */ ?> ---- Server IP: 202.89.58.1 Probable Submitter: 114.134.161.9 ---- Manual Page -- http://www.php.net/manual/en/function.function-exists.php Edit -- https://master.php.net/note/edit/89861 Del: integrated -- https://master.php.net/note/delete/89861/integrated Del: useless -- https://master.php.net/note/delete/89861/useless Del: bad code -- https://master.php.net/note/delete/89861/bad+code Del: spam -- https://master.php.net/note/delete/89861/spam Del: non-english -- https://master.php.net/note/delete/89861/non-english Del: in docs -- https://master.php.net/note/delete/89861/in+docs Del: other reasons-- https://master.php.net/note/delete/89861 Reject -- https://master.php.net/note/reject/89861 Search -- https://master.php.net/manage/user-notes.php