Generate unique slug Codeigniter 3 && MySQL - php

Question

I need to generate unique slug based on user input with this code:
public function create_slug($id, $name){
$count = null;
$name = url_title($name);
while(true) {
$this->db->select('id');
$this->db->where('id !=', $id);
$this->db->where('slug', $name);
$query = $this->db->get('users');
if ($query->num_rows() == 0) {
break;
} else {
$name .= '-' . (++$count);
}
}
return $name;
}
It select everything that mach the slug ($name), except its own slug.
The result for first user input - 123 is slug - 123. For second same input the slug is 123-1, but third input with same text is with result 123-1-2, which is not what I want.
I tried another way :
public function create_slug($id, $name){
$count = null;
$name = url_title($name);
$this->db->select('id');
$this->db->where('id !=', $id);
$this->db->where('slug', $name);
$query = $this->db->get('users');
if($query->num_rows()){
$count = '-' . ($query->num_rows() + 1);
}
return $name . $count;
}
Here, is same query, but count rows + 1.
For first 123 the slug is 123;
Second 123, slug 123-2;
Third 123, slug again 123-2, which is not unique.
How can I create slug that is based on some user input and is unique and, if there is slug with value name, next will be name-1, if again, next will be name-2 and etc. ?

Answer 1

You need to create a temp slug_name based on the original name, and test the slug_name. On fail, recreate new slug_name based on original name. On success (breaking out of the loop) return the amended slug_name.
public function create_slug($id, $name)
{
$count = 0;
$name = url_title($name);
$slug_name = $name; // Create temp name
while(true)
{
$this->db->select('id');
$this->db->where('id !=', $id);
$this->db->where('slug', $slug_name); // Test temp name
$query = $this->db->get('users');
if ($query->num_rows() == 0) break;
$slug_name = $name . '-' . (++$count); // Recreate new temp name
}
return $slug_name; // Return temp name
}
Or like this using count_all_results. Removed your id check as well as I presume the slug needs to be unique for the entire table.
public function create_slug($id, $name)
{
$count = 0;
$slug_name = $name = url_title($name);
while(true)
{
$this->db->from('users')->where('slug', $slug_name);
if ($this->db->count_all_results() > 0) break;
$slug_name = $name . '-' . (++$count);
}
return $slug_name;
}