PHP 5

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8"  />
  </head>
<body>
<table border=1>
	<tr>
	<td>Вид</td>
	<td>Цена</td>
	<td>Количество</td>
	</tr>
	<tr>
		
		<td>Картофи</td>
	<td>0.99</td>
	<td>10 кг.</td>
		
		
	</tr>	
	
	
</table>

</body>

</html>

include

include() include_once() require() require_once();

<?php include("header.php"); include("menu.php"); ?>

<table border=1> <tr>

<td>Вид <td>Цена <td>Количество <?php foreach($_SESSION['buy'] as $value) { echo ' '.$value['vid'].' '.$value['price'].' '.$value['quantity'].' '; } ?>

<?php

include("footer.php");

?>

• trim();
• strip_tags();
• is_numeric($var);
• mb_strlen();
• mb_internal_encoding();