php - isset() not giving expected results -

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i have form

<form action="addnote.php" method="post">     <input type="hidden" name="tid" <?php echo"value='$id'"; ?> >     <div class="input_fields_wrap1">         <label>note</label>         <input type="text" id="coa" name="notes[]" >         <button class="add_field_button1">add more notes</button>     </div>     <label>next call date</label>     <input type="date" name="call" >     <div class="form-group">         <label class="col-md-3 control-label" for="example-text-input"></label>         <div class="col-md-3">             <input input type="submit" value="submit " >         </div>     </div> </form>

and php code

<?php     include 'db.php';     $id=$_post['tid'];     $notes=$_post['notes'];     if(isset($_post['notes']))     {         for($i=0;$i<count($notes);$i++)         {             $sql="insert notes (lead_id,note) value ('$id','$notes[$i]')";             $var=mysqli_query($conn, $sql);         }     }     if(isset($_post['call']))     {         $call=mysqli_real_escape_string($conn,$_post['call']);         $sql="update lead set `call`='".$call."' lead_id='$id'";         $var=mysqli_query($conn, $sql);     }     header("location: remove_lead.php"); ?>

now, if don't fill date or notes text box, date still gets updated 0000-00-00 , empty note stored in database.

but want is: if don't fill 1 or both of them, nothing should happen on php. did use isset() correctly?

i changed suggested no use

if(!empty($_post['notes'])&&isset($_post['notes'])) {     $notes=$_post['notes'];     for($i=0;$i<count($notes);$i++)     {         $sql="insert notes (lead_id,note) value ('$id','$notes[$i]')";         $var=mysqli_query($conn, $sql); } } if(!empty($_post['call'])&&isset($_post['call'])) {     $call=mysqli_real_escape_string($conn,$_post['call']);     $sql="update lead set `call`='".$call."' lead_id='$id'";     $var=mysqli_query($conn, $sql); }

isset() not check empty() check whether variable or array or object set.

you need check empty.

if(isset($_post['notes']) && !empty($_post['notes']))

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