mysql - Not able to delete or update a row in PHP? -

i working on first php app simple notes taking application. using different urls notes -

echo "<p><a href='/see_note.php?id={$row["note_id"]}'>{$row['note']}</a></p>"; 

so, primary key acts parameter url of note. link redirects me note without problem, when try delete or update note throws error -

undefined index: id in /home/user/phpstormprojects/notes/see_note.php on line 17 

line 17 extracting id url -

$note_id = $_get['id']; 

here rest of code page displaying note-

//get id url $note_id = $_get['id'];  //fetch note database $query = "select note notes note_id = '$note_id'"; $query_result = mysqli_query($dbconn, $query) or die(mysqli_error($dbconn)); $row = mysqli_fetch_assoc($query_result); $note = $row['note'];  //update note if(isset($_post['save_note_btn'])) {     $note = $_post['note'];      $query = "update notes set note = '$note' note_id ='$note_id'";     $query_result = mysqli_query($dbconn, $query) or die(mysqli_error($dbconn));     header("location: home.php"); }  //delete note if(isset($_post['del_note_btn'])) {     $query = "delete notes note_id = '$note_id'";     $query_result = mysqli_query($dbconn, $query) or die(mysqli_error($dbconn));     header("location: home.php"); }  mysqli_close($dbconn);  ?>  //this note displayed , edited <form method="post" action="see_note.php">     <textarea name="note" placeholder="your note" rows="20" cols="140">         <?php echo $note; ?>     </textarea>     <button type="submit" name="save_note_btn">save</button> </form>  //button delete note <form method="post" action="see_note.php">     <button type="submit" name="del_note_btn">delete</button> </form> 

the code seems fine me, have no idea causing error. maybe have made silly mistake. please help.

the problem because of following 2 lines,

//this note displayed , edited <form method="post" action="see_note.php">                             ^^^^^^^^^^^^     ... 

and

//button delete note <form method="post" action="see_note.php">                             ^^^^^^^^^^^^     ... 

you need append note's id along action attribute, this:

//this note displayed , edited <form method="post" action="see_note.php?id=<?php echo $note_id; ?>">     ... 

and

//button delete note <form method="post" action="see_note.php?id=<?php echo $note_id; ?>">     ... 

---

sidenote:

keep line is,

//get id url $note_id = $_get['id'];