Undefined variable even I defined it [duplicate] - php

Question

This question already has answers here:
"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP
(29 answers)
Closed 3 years ago.
[20-Mar-2019 04:24:48 America/New_York] PHP Notice: Undefined variable: start_date in /home/wwwrsfcrm/public_html/airportextras/admin/advance-settings.php on line 244
[20-Mar-2019 04:24:48 America/New_York] PHP Notice: Undefined variable: end_date in /home/wwwrsfcrm/public_html/airportextras/admin/advance-settings.php on line 246
Here is my code
<?php include('inc/header.php'); ?>
<?PHP
session_start();
if($_SESSION['username']=='' && $_SESSION['password']==''){
header('Location: index');
}
?>
<?php include('inc/sidebar.php'); ?>
<?php
$currentid = $_SESSION['aid'];
$con = mysqli_connect("localhost","root","password","database");
//Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query = "SELECT * FROM disabled_dates WHERE agent_id = '$currentid'";
$result = mysqli_query($con, $query);
if(mysqli_num_rows($result) > 0)
{
while($row = mysqli_fetch_array($result))
{
$start_date = $row['start_date'];
$end_date = $row['end_date'];
}
}
?>
<div class="col-sm-9 col-sm-offset-3 col-lg-10 col-lg-offset-2 main">
<div class="row">
<ol class="breadcrumb">
<li><svg class="glyph stroked home"><use xlink:href="#stroked-home"></use></svg></li>
<li class="active">Icons</li>
</ol>
</div><!--/.row-->
<div class="row">
<div class="col-lg-12">
<h1 class="page-header"></h1></h1>
</div>
</div><!--/.row-->
<div class="row">
<div class="col-lg-12">
<div class="panel panel-default">
<div class="panel-heading">Airport Parking Advance Settings</div>
<div class="panel-body">
<div class="col-md-12">
<button class="btn btn-primary" data-toggle="modal" data-target="#cpbd" id="link_bt">Change Price by Date</button>
<button class="btn btn-primary" data-toggle="modal" data-target="#soobd" id="link_bt">Service Disable by Date</button>
<!--Change Price by Date Modal -->
<div id="cpbd" class="modal fade" role="dialog">
<div class="modal-dialog">
<!-- Modal content-->
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Change Prices by Date</h4>
</div>
<div class="modal-body">
<p>
<form role="form" method="post" action="changed-prices" id="sign_in" autocomplete="off">
<div class="row">
<div class="col-md-12 col-sm-12 col-xs-12">
<div class="form-group plates-options">
<label>Change Prices by Date</label>
<input type="date" id="check_out" name="sdate" placeholder="Date" class="form-control" aria-required="true" required>
</div>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group">
<label>Day Price</label>
<input name="dayprice" type="text" class="form-control" placeholder="Day Price" required>
</div>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group">
<label>Additional Day Price</label>
<input name="addprice" type="text" class="form-control" placeholder="Additional Day Price" required>
</div>
</div>
<div class="col-md-12 col-sm-12 col-xs-12">
<h3>Prices for Meet & Greet</h3>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group">
<label>Fixed Price</label>
<input name="mgfixprice" type="text" class="form-control" placeholder="Fixed Price" required>
</div>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group">
<label>Flexible Price</label>
<input name="mgflexprice" type="text" class="form-control" placeholder="Flexible Price" required>
</div>
</div>
<div class="col-md-12 col-sm-12 col-xs-12">
<h3>Prices for Park & Ride</h3>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group">
<label>Fixed Price</label>
<input name="prfixprice" type="text" class="form-control" placeholder="Fixed Price" required>
</div>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group">
<label>Flexible Price</label>
<input name="prflexprice" type="text" class="form-control" placeholder="Flexible Price" required>
</div>
</div>
</div><!-- End row -->
<div class="row">
<div class="col-md-12 col-sm-12">
<div class="form-group">
<input type="submit" name="pricedate" value="Submit" class="btn btn-primary" id="price-date">
</div>
</div>
</div>
</form>
</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<!--Add Off Hours to take booking Modal -->
<div id="soobd" class="modal fade" role="dialog">
<div class="modal-dialog">
<!-- Modal content-->
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Service Disable by Date</h4>
</div>
<div class="modal-body">
<p>
<form role="form" method="post" action="service-disable" id="sign_in" autocomplete="off">
<div class="row">
<h3>Service Disable by Date</h3>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group plates-options">
<label>Start Date</label>
<input class="form-control" data-date-format="M d, D" type="date" name="sdate" placeholder="Date" required>
</div>
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
<div class="form-group plates-options">
<label>End Date</label>
<input class="form-control" data-date-format="M d, D" type="date" name="edate" placeholder="Date" required>
</div>
</div>
</div><!-- End row -->
<div class="row">
<div class="col-md-12 col-sm-12">
<div class="form-group">
<input type="submit" name="specificdate" value="Submit" class="btn btn-primary" id="hours">
</div>
</div>
</div>
</form>
</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div> <br><br>
<div class="table-responsive">
<table class="table table-bordered">
<tr>
<h3>Your Service's Disable Dates </h3>
<tbody>
</tr>
<tr>
<th>Start Date</th>
<th>End Date</th>
</tr>
<tr>
<td> <?php echo $start_date; ?> </td>
<td> <?php echo $end_date; ?></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div><!-- /.col-->
</div><!-- /.row -->
</div><!--/.main-->
<script src="js/jquery-1.11.1.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/chart.min.js"></script>
<script src="js/chart-data.js"></script>
<script src="js/easypiechart.js"></script>
<script src="js/easypiechart-data.js"></script>
<script src="js/bootstrap-datepicker.js"></script>
<link rel="stylesheet" type="text/css" href="https://code.jquery.com/ui/1.12.1/themes/pepper-grinder/jquery-ui.css">
<link rel="stylesheet" type="text/css" href="https://cdn.rawgit.com/dubrox/Multiple-Dates-Picker-for-jQuery-UI/master/jquery-ui.multidatespicker.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<script src="https://cdn.rawgit.com/dubrox/Multiple-Dates-Picker-for-jQuery-UI/master/jquery-ui.multidatespicker.js"></script>
<form name="select-multiple">
<script>
$("#addday").change(function () {
$("#adddayprice").toggle();
});
$("#mg").change(function () {
$("#mgprice").toggle();
$("#mgprice2").toggle();
});
$("#pr").change(function () {
$("#prprice").toggle();
$("#prprice2").toggle();
});
!function ($) {
$(document).on("click","ul.nav li.parent > a > span.icon", function(){
$(this).find('em:first').toggleClass("glyphicon-minus");
});
$(".sidebar span.icon").find('em:first').addClass("glyphicon-plus");
}(window.jQuery);
$(window).on('resize', function () {
if ($(window).width() > 768) $('#sidebar-collapse').collapse('show')
})
$(window).on('resize', function () {
if ($(window).width() <= 767) $('#sidebar-collapse').collapse('hide')
})
</script>
</body>
</html>

Answer 1

Solution 1 :
Before the While/if/else :
$start_date = $end_date = NULL;
In the html :
<?php echo (!empty($end_date))?$end_date:"0000/00/00"; ?>
//same with start_date
//or
<?php if(!empty($end_date)){
echo $end_date;
}else{
echo "0000/00/00";
}?>
Solution 2 :
Only in the html :
<?php echo (isset($end_date))?$end_date:"0000/00/00"; ?>
//same with start_date