Results on the same page as the search form php - php

Question

How can i echo the results in the same page as the search form is (wordpress)?(i`m newbie)
<form action="" id="searchform" method="POST">
<input name="searchquery" type="text" placeholder="Nume, spital" size="30" maxlength="40">
<select name="filter">
<option value="ALL">Toate judetele</option>
<option value="AB">Alba</option>
</select>
<input type="submit" value="Cauta">
</form>
the php code
global $wpdb;
$con=mysqli_connect("localhost","root","");
$search = mysql_real_escape_string(trim($_POST['searchquery']));
if($_POST['filter'] == "ALL"){
$sqlCommand = $wpdb->get_results("SELECT * FROM `wp_doctors` WHERE `name` LIKE '%searchquery%'");
} else if($_POST['filter'] == "AB"){ $sqlCommand = $wpdb->get_results("SELECT * FROM `wp_doctors` WHERE `name` LIKE '%searchquery%' AND `city`= 'Alba' ");
} //more if`s, i just cuted for example
foreach ( $sqlCommand as $result)
{
echo $result->id;
echo $result->name;
echo $result->spec;
}
and if i`m using at the form action atribute it will take me to the index page.
Thanks!

Answer 1

Try putting in the form action :
action="<?=$_SERVER['PHP_SELF']?>"
In order to test if you are not being redirected by wordpress, try this
in your php code:
if(isset($_POST)){
var_dump($_POST);
}
In this way you can clear out if the page is posting right and if you are being
redirected somewhere by wordpress.