PHP code inside Javascript function not working(insert into) [duplicate]

<script>
function getMeta(){   
    var img = new Image();
    img.onload = function(){
        if (this.width != 468 && this.height != 60)
		  {alert( 'Error : only these image sizes are accepted : 468x60' );
		  return false;}
		  
		  else
		  alert( 'loaded successfully' );
		  document.getElementById('form1').submit();
		  <?php

            include("connection.php");
            $email=$_POST["t1"];
            $email=addslashes($email);
	        $img=$_POST["t2"];
	        $img=addslashes($img);
	        $target=$_POST["t3"];
	        $target=addslashes($target);
  
            $sql=mysql_query("insert into b1(email, img, target) values  ('$email', '$img', '$target')");
   
?>

    };
	img.onerror = function() {alert( 'Error : this is not a valid image');
	return false;
	 };
    img.src = document.getElementById('t2').value;
	return true;
}


</script>