Random and unique number generation process in php -


please check below example better explanation.

in form have below fields

example :

account creation count : 300 account prefix : 123 (value depend on user) account length : 4 (value depend on user)

here length of account prefix 3 , account length 4 4-3 =1

here 1 if create random characters between 0-9 =10 , a-z =26 total 36 user can create maximum 36 accounts prefix.

but want check in database number prefix , random number

like random single digit "d" execute query like

select id table length(number) =4 , number '123d'

if exist in database need create random character.

i using below function going infinite loop.

code :

function find_uniq_rendno_accno($length = '1', $field = '', $tablename = '',$prefix) {     $key = '';     $keys = array_merge(range(0, 9), range('a', 'z'));      ($i = 0; $i < $length; $i++) {         $key .= $keys[array_rand($keys)];     }      $where = array($field => $default.$string);      $acc_result = $this->ci->db_model->getselect('count(id) count', $tablename, $where);     while ($acc_result[0]['count'] != 0) {       $key=  $this->find_uniq_rendno_accno($length, $field, $tablename,$default);     }     return $key;     }

please me out problem.

thanks in advance.


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