Why PHP function returns TRUE?-CodePudding

Why does my isset() function return true when the value from the select option in the HTML form is set to ="" which I was expecting to be NULL and the isset() function should return FALSE ?

This is the HTML select option:

<select name="filler">
 <option value="">Select Transfer</option>
 <option value="1">Option 1</option>
 <option value="2">Option 2</option>
 <option value="3">Option 3</option>
</select>

Inside this isset function i've added a JS alert and this alert is triggered

 if(isset($_POST['filler'])) {
    ?>
    <script>
    alert("filler item in post");
    </script>
   ....other PHP code runs here....

 }

CodePudding user response：

The

CodePudding user response：

isset() is used to check if the variable is set with the value or not

and after isset you can also check empty

Empty() is used to check if a given variable is empty or not. isset() returns true when the variable is not null whereas Empty() returns true if the variable is an empty string.

CodePudding user response：

use this:

$option = isset($_POST['filler']) ? $_POST['filler'] : false;