Solution to the Notice: Undefinedindex error prompt in php

Solution to the Notice: Undefinedindex error prompt in php

If (array_key_exists ('strue ', $ _ POST )) { If ($ _ POST ['strue']) { $ Istrue = $ _ POST ['strue']; } } Else { $ Istrue = ''; } The following judgment can be made: Elseif ($ istrue = 'OK ') To avoid such errors, you can refer to some program systems. For details, refer to dedecms or phpcms code. // Check and register external submitted variables Foreach ($ _ REQUEST as $ _ k => $ _ v) { If (strlen ($ _ k)> 0 & eregi ('^ (cfg _ | GLOBALS)', $ _ k )) { Exit ('request var not allow! '); } } Function _ RunMagicQuotes (& $ svar) { If (! Get_magic_quotes_gpc ()) { If (is_array ($ svar )) { Foreach ($ svar as $ _ k = >$ _ v) $ svar [$ _ k] = _ RunMagicQuotes ($ _ v ); } Else { $ Svar = addslashes ($ svar ); } } Return $ svar; } Foreach (Array ('_ get',' _ post', '_ COOKIE') as $ _ request) { Foreach ($ _ request as $ _ k = >$ _ v) $ {$ _ k} = _ RunMagicQuotes ($ _ v ); } If (empty ($ istrue )) { $ Istrue = ''; }