Membuat 3 inputan pencarian dengan kata kunci 1 atribut per inputan pencarian di php

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<pre> &lt;!DOCTYPE html&gt; &lt;html lang="en"&gt; &lt;head&gt; &lt;title&gt;Searching&lt;/title&gt; &lt;meta charset="utf-8"&gt; &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt; &lt;link rel="stylesheet" href="bootstrap/css/bootstrap.css"&gt; &lt;script src="js/jquery.js"&gt;&lt;/script&gt; &lt;script src="bootstrap/js/bootstrap.min.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt;

<?php
include 'config.php';
?>
<div class="container" style="padding-top: 20px; padding-bottom: 20px;">
	<h3>Form Pencarian Dengan PHP</h3>
	<hr>


			<form role="form" action="index.php" method="get">
				<div class="form-group">
					<label>Cari :</label>
					<input type="text" name="cari" placeholder="id">
					<input type="text" name="cari2" placeholder="nama">
					<input type="text" name="cari3" placeholder="fakultas">
				</div>

			<input type="submit" name="simpan" value="Search" placeholder="fakultas">
			</form>


			<?php
			if(isset($_GET['cari'])){
				$cari = $_GET['cari'];
				echo "<b>Hasil pencarian : ".$cari."</b>";
			}
			?>

			<table class="table table-striped">
				<tr>
					<th>ID</th>
					<th>Nama</th>
					<th>Fakultas</th>
				</tr>
				<?php
				if(isset($_GET['simpan'])){
					$cari = $_GET['cari'];
        $cari2 = $_GET['cari2'];
        $cari3 = $_GET['cari3'];
        $gabung = "";

        if ($cari != "") {
          $gabung .= "AND id like '%".$cari."%'";
        }
        if ($cari2 != "") {
          $gabung .= "AND nama like '%".$cari2."%'";
        }
        if ($cari3 != "") {
          $gabung .= "AND fakultas like '%".$cari3."%'";
        }
        $gabung = "WHERE " .ltrim($gabung, "AND ");
					$data = mysql_query("select * from mhs $gabung");


				while($d = mysql_fetch_array($data)){
				?>
				<tr>
					<td><?php echo $d['id']; ?></td>
					<td><?php echo $d['nama']; ?></td>
					<td><?php echo $d['fakultas']; ?></td>
				</tr>
				<?php }
				} ?>
			</table>

		</div>
	</div>
</div>

&lt;/body&gt; &lt;/html&gt; </pre>