Question

I just need help on finishing this validation I have where the php checks to see if there are any errors when user submits form:

$errors = array();


      if (!$getcourseid){
          $errors[] = "You must enter in Course's ID";
  }else if (!$getcoursename){
      $errors[] = "You must enter in Course's Name";
  }else if (!$getduration){
          $errors[] = "You must select Course's Duration";
      }     

      if(!$errors) {

     $insertsql = "
    INSERT INTO Course
        (CourseNo, CourseName, Duration)
      VALUES
        (?, ?, ?)
    ";
    if (!$insert = $mysqli->prepare($insertsql)) {
      // Handle errors with prepare operation here
    }                                           

    $insert->bind_param("sss", $getcourseid, $getcoursename, $getduration);

    $insert->execute();

    if ($insert->errno) {
      // Handle query error here
    }

    $insert->close();

     // don't use $mysqli->prepare here
$query = "SELECT CourseNo FROM Course WHERE CourseNo = ?";
// prepare query
$stmt=$mysqli->prepare($query);
// You only need to call bind_param once
$stmt->bind_param("s",$getcourseid);
// execute query
$stmt->execute(); 
// get result and assign variables (prefix with db)
$stmt->bind_result($dbCourseId);
//get number of rows
$stmt->store_result();
$numrows = $stmt->num_rows();  

          }

$form = "
<form action='" . htmlentities($_SERVER["PHP_SELF"]) . "' method='post'>
  <table>
  <tr>
  <td></td>
  <td id='errormsg'>$errormsg</td>
  </tr>
  <tr>
  <td>Course ID:</td>
  <td><input type='text' name='courseid' value='$getcourseid' /></td>
  </tr>
  <tr>
  <td>Course Name:</td>
  <td><input type='text' id='nameofcourse' name='coursename' value='$getcoursename' /></td>
  </tr>
  <tr>
  <td>Duration (Years):</td>
  <td>{$durationHTML}</td>
  </tr>
  <tr>
  <td></td>
  <td><input type='submit' value='Create Course' name='createbtn' /></td>
  </tr>
  </table>
  </form>";

  echo $form;

My question is that I want to display a success message if there are no errors and the database stuff have been successfully completed or display an error message if the form has been completed with no errors but the database stuff could not be completed. Also I want to display all messages to the $errormsg variable? Can I ask how that can be done?

Below is something I want to achieve but not sure if its correct for the code above:

               if ($numrows == 1){

               $errormsg = "<span style='color: green'>Course " . $getcourseid .  " - "  . $getcoursename . " has been Created</span>";
               $getcourseid = "";
               $getcoursename = "";
               $getduration = "";

           }else{

               $errormsg = "An error has occured, Course has not been Created";

           }

Answer 1

The logic goes like this, suppose you are having an array of errors simply you can do this

if(empty($errormsg)) {
   //Go Ahead
} elseif(!empty($errormsg)) {
  //if(isset($errormsg['index'])) {
     echo 'Error'; 
  }
}

Detailed Explanation

Supposing you have 3 errors like

$errors[0] = 'Username is invalid';
$errors[1] = 'Password is invalid';
$errors[2] = 'Third error';

if(empty($errors)) {
   //Go Ahead
} else {
    if(isset($errors[0])) {
       echo $errors[0]; 
    } elseif (isset($errors[1])) {
       echo $errors[1];
    } elseif (isset($errors[1])) {
       echo $errors[1]; 
    }
}