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Generate a random reference code and check it's unique

/ Published in: PHP
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  1. $unique = FALSE;
  2.  
  3. while ($unique == FALSE){
  4.  
  5. $ref = md5(date('r', time()) . rand(0,100)); 
  6.  
  7. $check_ref = mysql_query("SELECT ref FROM table_name WHERE ref = '$ref'");
  8.  
  9. if(mysql_num_rows($check_ref)==0){
  10.  
  11. $unique = TRUE;
  12.  
  13. }
  14.  
  15. }

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