hidden values are not passing in form action

Question

When I save this form all type="text" fields are working fine. But hidden field values are not passing.

If I changed from "hidden" to "text" it works fine. I don't know why I am getting this problem.

<form  action="../model/meter-reading-model" method="POST">

<input type='hidden' name='hdnTakenDate' id='hdnTakenDate' value='<?php echo $TakenDate; ?>' />

<input type='hidden' name='hdnSiteHeadDbKey' id='hdnSiteHeadDbKey' value='<?php echo $SiteHeadDbKey; ?>' />

<button type='submit' name="btnSaveData" id="btnSaveData" class='btn btn-lg btn-danger'> Save Reading Data </button>
</form>

Receiving in another page

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if(isset($SaveData)){   
        $TakenDate = mysqli_real_escape_string($conn, $_POST['hdnTakenDate']);
        $SiteHeadDbKey = mysqli_real_escape_string($conn, $_POST['hdnSiteHeadDbKey']);   
    }               
}

Answer 1

It solved for me when i change this

<input type='hidden' name='hdnTakenDate' id='hdnTakenDate' value='<?php echo $TakenDate; ?>' />

<input type='hidden' name='hdnSiteHeadDbKey' id='hdnSiteHeadDbKey' value='<?php echo $SiteHeadDbKey; ?>' />

to this

<input type='hidden' name='hdnTakenDate' id='hdnTakenDate' value='<?php echo $TakenDate; ?>' **/>**

<input type='hidden' name='hdnSiteHeadDbKey' id='hdnSiteHeadDbKey' value='<?php echo $SiteHeadDbKey; ?>' **/>**