To Check the Email in DB using PHP

index.php:

 <p>Email ID:<span style="color:red;">*</span></p>
 <input type="email" class="search" name="email" 

   required="required" autocomplete="off"/>

      <?php echo $email_error;?></p>

Coding:

<?php 
 ob_start("ob_gzhandler");
 include('admin/conn.php');
 session_start();
 if(isset($_POST['submit'])!="")
 {
 $email=$_POST['email'];
 $search_num1=mysql_query("select * from signup  where email='$email'")

  or die(mysql_error());
 $fetch1=mysql_num_rows($search_num1);
 if($fetch1)
 {
 $email_error="<span style=color:red; font-size:16px;><b>Already Exit This Email!</b></span>";  
 }
 else
 {
?><?php }} ?>