Saving data in a JSON file with WordPress AJAX -

so have wordpress ajax function retrieves mysql data json , logs it. want not directly data on page ajax function is, want save data json file instead, can use wider variety of purposes.

here ajax function:

$.get(         ajax_url,         data,         function(data) { // ajax callback             fill_json(data);         }// end ajax callback     ); 

the fill_json() function echo json data in table wrote myself.

now here happens inside ajax hook:

$sql_search = $wpdb->get_results(" complicated mysql search here "); if(!empty($_server['http_x_requested_with']) && strtolower($_server['http_x_requested_with']) == 'xmlhttprequest') {         $result = json_encode($result);                  echo $result;     } else {         header("location: ".$_server["http_referer"]);     } 

underneath echo $result; in ajax hook tried following piece of code, don't know how can see if worked or not:

        $json_path = "/var/www/vhosts/jtc.ae/httpdocs/pre/wp/wp-content/themes/amazing_japan_hp/new/search.json";         file_put_contents($json_path, $result); 

my question:
is correct way save data json file, , how can data on main page then?

extra question: saving $result json file conflict multiple users using ajax @ same time?

all did right .. please make sure steps below :

1. pass write permission folder /new inside "amazing_japan_hp" (chmod -r 666 /new)
2. to save data in file use file_put_contents($file, $current);

3. to data file use $current = file_get_contents($file);

4. for newly created files try use umask. provides required permission files writing content in

umask() sets php's umask mask & 0777 , returns old umask. when php being used server module, umask restored when each request finished.