Validating a greater than/less than numeric amount on php form - php

Question

I am trying to create a form in which a logged in user can enter a sale (ltd_entry_amount), but only sales that are $200.00 or more, but with no luck. If I get rid of the '> 199.99' the form works ok but for now the 'Please check all manatory fields are complete and try again.' message shows. Can anyone help?
<?php
require_once ('./includes/config.inc.php');
$page_title = 'Log a Sale';
include ('./includes/header.html');
if (!isset($_SESSION['ltd_user_id'])) {
$url = 'http://' . $_SERVER['HTTP_HOST']
. dirname($_SERVER['PHP_SELF']);
if ((substr($url, -1) == '/') OR (substr($url, -1) == '\\') ) {
$url = substr ($url, 0, -1); // Chop off the slash.
}
$url .= '/login.php';
ob_end_clean(); // Delete the buffer.
header("Location: $url");
exit(); // Quit the script.
}
$users = $_SESSION['ltd_user_id'];
if (isset($_POST['submitted'])) {// Handle the form.
require_once ('database.php');
// Connect to the database.
$errors = array(); // Initialize error array.
// Check for a Invoice Number.
if (empty($_POST['ltd_invoice_no'])) {
$errors[] = '<p>• You forgot to enter your Invoice Number.</p>';
} else {
$inv = escape_data($_POST['ltd_invoice_no']);
}
// Check for invoice amount.
if (empty($_POST['ltd_entry_amount']) < 199.99) {
$errors[] = '<p>• You forgot to enter your Total Amount. Please ensure it is at least $200.00</p>';
} else {
$amount = escape_data($_POST['ltd_entry_amount']);
}
// Check for business name.
if (empty($_POST['ltd_business_name'])) {
$errors[] = '• You forgot to enter your Dealership Name.';
} else {
$dealer = escape_data($_POST['ltd_business_name']);
}
if (empty($errors) && $amount) { // If everything's OK. // If everything's OK.
// Make sure the invoice number is available.
$uid = #mysql_insert_id(); //Get the url ID.
// Add the user.
$query = "INSERT INTO ltd_sales_list (ltd_item_id , ltd_user_id, ltd_invoice_no, ltd_entry_amount, ltd_entry_userdate, ltd_business_name, ltd_entry_date) VALUES
('$uid', '$users', '$inv', '$amount', '$_POST[ltd_entry_userdate]', '$dealer' , NOW())";
$result = #mysql_query ($query); // Run the query.
if (mysql_affected_rows() == 1) {
// If it ran OK.
echo 'Your sale is registered into the system.';
include ('./includes/footer.html'); // Include the HTML footer.
exit();
} else { // If it did not run OK.
echo 'You could not be registered due to a system error. We apologize for any inconvenience.';
}
} else { // If one of the data tests failed.
echo 'Please check all manatory fields are complete and try again.';
}
mysql_close(); // Close the database connection.
} // End of the main Submit conditional.
?>
<form action="logsale.php" method="post">
<table width="550" border="0" cellspacing="1" cellpadding="5">
<tr>
<td width="250"><div align="right">Invoice Number <span class="red_light">*</span></div></td>
<td width="267">
<input type="text" name="ltd_invoice_no" size="30" maxlength="30" value="<?php if (isset($_POST['ltd_invoice_no'])) echo $_POST['ltd_invoice_no']; ?>" /></td>
</tr>
<tr>
<td><div align="right">Total Amount of sale
<em><strong>(exc. GST)</strong></em> <span class="red_light">*</span></div></td>
<td>
<input type="text" name="ltd_entry_amount" size="30" maxlength="30"
value="<?php if (isset($_POST['ltd_entry_amount'])) echo $_POST['ltd_entry_amount']; ?>" /></td>
</tr>
<tr>
<td></td>
<td>Please enter number only</td>
</tr>
<tr>
<td><div align="right">Date of Invoice</div></td>
<td>
<script type="text/javascript">
$(function() {
$("#datepicker").datepicker({ dateFormat: "dd/mm/yy" }).val()
});
</script>
<input size="30" maxlength="10" id="datepicker" name="ltd_entry_userdate" type="text" value="<?php if (isset($_POST['ltd_entry_userdate'])) echo $_POST['ltd_entry_userdate']; ?>" /></td>
</tr>
<tr>
<td></td>
<td><span class="sml_italics"><strong>Please enter as <strong>DD-MM-YYYY</strong></td>
</tr>
<tr>
<td><div align="right">Dealership <span class="red_light">*</span></div></td>
<td><input type="text" name="ltd_business_name" size="50" maxlength="60" value="<?php if (isset($_POST['ltd_business_name'])) echo $_POST['ltd_business_name']; ?>" /></td>
</tr>
<tr>
<td></td>
<td><p><input type="submit" name="submit" value="Submit" /></p><input type="hidden" name="submitted" value="TRUE" />
</td>
</tr>
</table>
</form>
<?php
include ('./includes/footer.html');
?>

Answer 1

if (empty($_POST['ltd_entry_amount']) < 199.99) {
You are comparing a boolean value with a float number
You must separate both conditions:
if(empty($_POST['ltd_entry_amount']) or $_POST['ldt_entry_amount'] < 199.99){

Answer 2

It looks like there is a problem with your if statement:
if (empty($_POST['ltd_entry_amount']) < 199.99)
should be
if (empty($_POST['ltd_entry_amount']) || $_POST['ltd_entry_amount'] < 199.99)