When writing or building functions
First I write the name and variables of the function.
public function email_login($email, $password) { } Then I start describing the algorithm of the function line by line every step.
public function email_login($email, $password) { // check if email is existing // if existing verify password // if correct password return user information // if not show response invalid_password // if email is not existing show response email_not_found } Then I write the algorithm one by one checking if it is working in the program until the last step. And that's it I've completed building the full function.
public function email_login($email, $password) { // check if email is existing $this->db->where('email', $email); $query = $this->db->get('users'); $user = $query->row_array(); // if existing verify password if ($user != null) { // if correct password return user information if ($user["password"] == $password) { return $user; // if not show response invalid_password } else { return "invalid_password"; } // if not show response email_not_found } else { return "email_not_found"; } } 
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