cannot display 0 value in an html textbox - php

Question

I'm displaying data from mysql using php.
You can see the value is 0 for Current Balance
But in edit mode it cant display 0
Before executing update statement
I declare its variable from its corresponding $_POST variable
if (!empty($_POST)) {
$ID = $_POST['ID'];
$Name = $_POST['Name'];
$AID = $_POST['AID'];
$CurrentBalance = $_POST['CurrentBalance'];
$valid = true;
if ($valid) {
$setsu = dbSetsuzoku();
$setsu->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "UPDATE tabledb SET ID = ?, Name = ?, AID=?, CurrentBalance=? WHERE SubAgentID = ?";
$q = $setsu->prepare($sql);
$q->execute(array($ID,$Name,$AID,$CurrentBalance,$ID));
$setsu = null;
}
}
else {
$setsu = dbSetsuzoku();
$setsu->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "SELECT * FROM tabledb where ID = ?";
$q = $setsu->prepare($sql);
$q->execute(array($ID));
$data = $q->fetch(PDO::FETCH_ASSOC);
$ID = $data['ID'];
$Name = $data['Name'];
$AID = $data['AID'];
$CurrentBalance = $data['CurrentBalance'];
$setsu = null;
}
html (edit mode)
<input name="CurrentBalance" type="text" placeholder="CurrentBalance" value="<?php echo !empty($CurrentBalance)?$CurrentBalance:'';?>" required />
other fields follow the same logic

Answer 1

The problem is :
<?php echo !empty($CurrentBalance)?$CurrentBalance:'';?>
For empty function 0 is considered as empty - just look at http://au2.php.net/manual/en/function.empty.php
You can change it into:
<?php echo isset($CurrentBalance)?$CurrentBalance:'';?>

Answer 2

If you check the documentation of empty() function, you'll see that it will give back true for 0. Because of this you just display an empty string here:
<input name="CurrentBalance" type="text" placeholder="CurrentBalance" value="<?php echo !empty($CurrentBalance)?$CurrentBalance:'';?>" required />
Simple solution is to change the empty stirng to 0.