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<?
$vars=array("№1" => "volvo", "№2" => "saab","№3" => "saab & audi", "№4" => "mercedes","№5" => "audi");
	echo "<table border=1>";
	foreach ($vars as $k => $v) {
		echo "<tr><td>".$k."</td><td>".$v."</td></tr>";
	}
	echo "</table>";
?>


<form action="index.php" method="POST">
<select name="parametr">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="saabandaudi">Saab & Audi</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>
<input type="submit" value="JMI">
</form>

<?

if (isset($_POST['parametr']) && !empty($_POST['parametr'])) {
	
	foreach ($vars as $k => $v) {
		if (strstr(strtolower($v),strtolower($_POST['parametr']))) {
			echo $k." - ".$vars[$k]."<br>";
		}
	}
} else {
	echo "<table border=1>";
	foreach ($vars as $k => $v) {
		echo "<tr><td>".$k."</td><td>".$v."</td></tr>";
	}
	echo "</table>";
}
?>