php - Hiding/displaying button based on conditions and issues with basic queries -

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i in mid development of social networking site. trying hide , display buttons based on conditions set coming across difficulties before that. @ moment, mind cannot process how specify code.

i have add favourites visible on pages besides profile page of user logged in. let's assume logged in freddy, , go alice's profile page, button visible, , actions specified button work, data sent database. however, trying specify once user in logged in users favourites, add favourites button replaced remove favourites.

i unable first of all, specify user can favourite user once, @ moment, when add favourites clicked on profile, database update many rows, when freddy should allowed favourite alice once.

this have tried @ moment allow user favourited once:

 <?php // code process favourite request if (isset($_post['addfriend'])) {      $fav_request    = $_post['addfriend'];     $favourited_who = $user; // u variable     $favourited_by  = $username; // logged in user     /*     * need check user logged in, hasnt got $user in there favs     */      // step 1: favourites of logged in user...     $q = mysqli_query ($connect, "select * favourites");         while ($r_query = mysqli_fetch_array($q)) {             $db_fav_who = $r_query['favourited_who'];             $db_fav_by = $r_query['favourited_by'];     // step 2: check whether profile page user viewing, isnt in there favourites...        // check: see if $user isn't in there favourites.     if ($db_fav_by == $username){ // check see users favourites checking         // if user exists in logged in users favourites, display remove favourites button.         if ($db_fav_who == $user){             echo "<div class='edit_profile'>                 <input type='submit' class='btn btn-info' name='remfriend' value='remove favourites'>             </div";             }         }         }// while loop closed     if ($user != $username) { // check: see user isnt favouriting themself.         $favourite_user = mysqli_query($connect, "insert favourites values ('', '$favourited_who', '$favourited_by')");         echo "done ";     } } // if isset closed ?>

at moment, there 2 buttons visible when going onto anyone's (besides own) profile page:

<div class="edit-profile"> <?php      if ($user == $username){     // dont display buttons     }else { ?>         <form action="" method="post">         <?php          echo  "             <input type='submit' class='btn btn-info' name='sendmsg' value='send message'/>             <input type='submit' class='btn btn-info' name='addfriend' value='add favourites'>         </form>";     }     ?>  </div>

note: $user variable u variable in url. $username session variable logged in user.

how can add favourites button visible if he/she not in logged in users variable? , if are, how can remove favourites button visible instead of add favourites button?


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