php - Removing data from database according with what user selects -

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hy,

i have form data passed php script , in conjunction user selection php processes query. instead of validating query in relation input stops @ first condition , not evaluates rest.

bellow script

   $username=$_post['user']; $userid=$_post['id']; $studentname=$_post['studentname']; $studentsurname=$_post['studentsurname']; if(count($_post)>0){ if(isset($userid)){  echo 'var num'.$userid; $sql="delete user user_id=$userid";  $result=mysqli_query($conn,$sql); if(! $result ) {   die('could not delete data: '.mysqli_error()); } echo "deleted data successfully\n"; /*or die('error'.mysqli_error); echo 'student deleted';*/  }  else if(isset($username)){  echo 'var num'.$userid; $sql="delete user user_name='$username'";  $result=mysqli_query($conn,$sql); if(! $result ) {   die('could not delete data: '.mysqli_error()); } echo "deleted data successfully\n"; /*or die('error'.mysqli_error); echo 'student deleted';*/  }  else(isset($studentname)and isset($studentsurname)){  echo 'var num'.$userid; $sql="delete user name='$studentname' , surname='$studentsurname'";  $result=mysqli_query($conn,$sql); if(! $result ) {   die('could not delete data: '.mysqli_error()); } echo "deleted data successfully\n"; /*or die('error'.mysqli_error); echo 'student deleted';*/   } } else{  echo "you have not completed fild!"; }

and html form:

<!doctype html>  <html lang="en">     <head>         <meta charset="utf-8" />         <title>delete course</title>         <script src="validateuser.js"></script>      </head>     <body>         <form action="removeuser.php" method ="post">         <table>         <tr><td>         <label for="user">user name:</label>         </td>         <td>         <input type="text" id="user" name="user"></input>         </td></tr>         <tr><td>         <label for="id">user id:</label>         </td>         <td>         <input type="text" id="id" name="id"></input>         </td></tr>         <tr><td>         <label for="studentname">student name:</label>         </td>         <td>         <input type="text" id="studentname" name="studentname"></input>         </td></tr>         <tr><td>         <label for="studentsurname">         student surname:</label></td><td>         <input type="text" id="studentsurname" name="studentsurname"></input>         </td></tr>         <tr><td>          <tr><td>          <tr colspan="2"><td>  <input type="submit" value="add"/></td></tr>        </form>     </body> </html>

what doing wrong?

i modified querys refect string input variables inspired by: fred-ii, faruk, iolka , pankaj

the question still remains. how evaluate in seqvential order conditions because evaluations stops after if(isset($userid) if , receive mesage:

var num warning: mysqli_error() expects 1 parameter, 0 given in ... not delete data:

sincerely,

your first query alright because $userid integer 

$sql="delete user user_id=$userid";

rest of quires string change 

$sql="delete user user_name='$username'";     $sql="delete user name='$studentname' , surname='$studentsurname'";

run correspondent delete query based on user input 

 if (!empty($_post['id'])) {     $sql = "delete user user_id={$_post['id']}";     $result = mysqli_query($conn, $sql);     if (!$result) {         die('could not delete data: ' . mysqli_error());     } }  if (!empty($_post['user'])) {     $sql = "delete user user_name='{$_post['user']}'";     $result = mysqli_query($conn, $sql);     if (!$result) {         die('could not delete data: ' . mysqli_error());     } }  if (!empty($_post['studentname']) , ! empty($_post['studentsurname'])) {     $sql = "delete user name='{$_post['studentname']}' , surname='{$_post['studentsurname']}'";     $result = mysqli_query($conn, $sql);     if (!$result) {         die('could not delete data: ' . mysqli_error());     } }

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