I have this URL 123.com/?s=&cp_state=0&scat=16&sa=search&refine_search=yes

and this code on search.php

 <?php                  
 $searchTxt = trim( strip_tags( esc_attr( get_search_query() ) ) );
 $state_append = '';
 $state = $_GET['cp_state'];
 if($state != '0') 
 $state_append = __('', APP_TD).' ' . $state;
 $cat_id =  $_GET['scat'];
 if ( $searchTxt ==  __('What are you looking for? ', APP_TD) || $searchTxt ==       __('[All]', APP_TD) ) $searchTxt = '*';                        
  if($searchTxt){
 if($searchTxt == '*') {
 if($cat = get_term_by('id', $cat_id, 'ad_cat')) {
 printf( __("Ads %s %s ", APP_TD), $cat->name, $state_append, $wp_query->found_posts ); 
 } else {
 printf( __("Ads %s ", APP_TD), $state_append, $wp_query->found_posts ); 
 }
 } else {
 printf( __("What are you looking for? '%s' %s ", APP_TD), $searchTxt, $state_append,      $wp_query->found_posts ); 
 }
 }else{
 $searchTxt = trim( strip_tags( esc_attr( get_search_query() ) ) );
 printf( __("What are you looking for? '%s' %s ", APP_TD), $searchTxt, $state_append,      $wp_query->found_posts );
 }
 echo $cat_id;
 ?>

I would like to get the category name of the URL. I try to use "echo $cat_id" but gives me the number and not the name of the category.

How can I "echo" the name of category instead the number?

Thank you in advance!

I have this URL:
http://example.com/?s=&cp_state=0&scat=16&sa=search&refine_search=yes

and this code on search.php:

<?php                  
$searchTxt = trim( strip_tags( esc_attr( get_search_query() ) ) );
$state_append = '';
$state = $_GET['cp_state'];
if($state != '0') 
    $state_append = __('', APP_TD).' ' . $state;
     
$cat_id =  $_GET['scat'];
if ( $searchTxt ==  __('What are you looking for? ', APP_TD) || $searchTxt == __('[All]', APP_TD) ) 
    $searchTxt = '*';    
                          
if($searchTxt){
    if($searchTxt == '*') {
        if($cat = get_term_by('id', $cat_id, 'ad_cat')) {
            printf( __("Ads %s %s ", APP_TD), $cat->name, $state_append, $wp_query->found_posts ); 
        } else {
            printf( __("Ads %s ", APP_TD), $state_append, $wp_query->found_posts ); 
        }
    } else {
        printf( __("What are you looking for? '%s' %s ", APP_TD), $searchTxt, $state_append,      $wp_query->found_posts ); 
    }
}else{
    $searchTxt = trim( strip_tags( esc_attr( get_search_query() ) ) );
    printf( __("What are you looking for? '%s' %s ", APP_TD), $searchTxt, $state_append,      $wp_query->found_posts );
}
echo $cat_id;
?>

I would like to get the category name of the URL. I try to use echo $cat_id, but it gives me the number and not the name of the category.

How can I "echo" the name of category instead the number?