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Create Unique Code Replacing Lookalike Characters

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  1. function create_key(&$cnnDB){
  2. 	$letters = range('A','Z');
  3. 	$numbers = range(0,9);
  4. 	$all = array_merge($numbers,$letters);
  5. 	$foundkey = false;
  6. 	while(!$foundkey){
  7. 		for($i=0;$i<5;$i++){
  8. 			$num = rand(0,count($all)-1);
  9. 			$key .= $all[$num];
  10. 			$total += $num;
  11. 		}
  12.  
  13. 		//Replace Oh with Zero, I with one
  14. 		$key = str_replace(
  15. 					array('O','I'),
  16. 					array('0','1'),
  17. 					$key
  18. 		);
  19.  
  20. 		//make checksum
  21. 		$key .= $all[($total % count($all))];
  22.  
  23. 		$key = str_replace(
  24. 					array('O','I'),
  25. 					array('0','1'),
  26. 					$key
  27. 		);
  28.  
  29. 		$SQL = 'select C_Key from customers where C_Key = "'.$key.'"';
  30. 		$result = $cnnDB->GetRow($SQL);
  31. 		if(count($result) == 0){
  32. 			$foundkey = true;
  33. 		}
  34. 	}
  35.  
  36. 	return $key;
  37. }

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