Instructions
------------

- Go through this function line by line, and explain what the code does on each line
- Are there any mistakes that need correcting?
- What does the function do overall?
- What use case do you think this function serves? What's the business logic behind needing this function?
- Given your understanding of the function, what potential outputs do you expect from calling:  one("table_name", "column_name, "John")

<?php
function check_name($table, $column, $source_value, $counter = "", $arr_where = array(), $file_extension)
{
   if($counter == "")
   {
      $attempted_new_name = $source_value.$file_extension;
   }
   else
   {
      $attempted_new_name = $source_value."-".$counter.$extension;
   }

    $where = "";
    if(count($arr_where) > 0)
    {
        $where = " AND ".implode(" AND ",$arr_where);
    }

   $sql = "SELECT ".$column." FROM ".$table." WHERE ".$column." = ".sql_safe($attempted_new_name).$where;

   $result = mysqli_query_error_logged($sql);
   if(mysqli_num_rows($result) == 0)
   {
      return $attempted_new_name;
   }
   else
   {
      if($counter = "")
      {
         $counter = 2;
      }
      else
      {
         $counter++;
      }
      return one($table, $column, $source_value, $counter, $arr_where, $file_extension);
   }
}