get users who live within 10 km radius of the current logged in user codeigniter 3

First, get all "other" users from your database, i.e. all users where id is not the id of the current user. Get the results in an array named $users.
Also create a new empty array, named $nearby_Users.
Then, loop through all rows in the users array. Calculate the distance between the user's location and the location of the "current user", with your function getDistance().
If the distance is 10 km or less, add that user's data to the $nearby_Users array.
After the loop, do whatever you need with the $nearby_Users array.

There's no need to make a complicated SQL query to get the final result.

Thank you @Wouter60. let me impliment that