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Generate random caracters with random case and/or random digits

/ Published in: PHP
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A simple function that generates a string with random alphabet caracters (a to z) and/or digits. Note: the string generated is not guaranteed to be unique.

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  1. <?php
  2. /**
  3.  * Function that generates a string with random caracters.
  4.  * 
  5.  * $length: The length of the random string. 
  6.  * 
  7.  * $randomCase: If true, the generated string will also include uppercase alphabet caracters randomly.
  8.  * 
  9.  * $includeDigits: If true, the generated string will also include digits randomly.
  10.  */
  11. function random_chars($length = 10, $randomCase = false, $includeDigits = false)
  12. {
  13. 	$lower = 'abcdefghjkmnpqrstuvwxyz';
  14. 	$upper = 'ABCDEFGHJKMNPQRSTUVWXYZ';
  15. 	$digits = '0123456789';
  16. 	$chars = $lower . ($randomCase ? $upper : '') . ($includeDigits ? $digits : '');
  17. 	$str = '';
  18.  
  19. 	$last_index = strlen($chars) - 1;
  20. 	for($i = 0; $i < $length; $i++)
  21. 	{
  22. 		mt_srand(hexdec(uniqid()));
  23. 		$str .= $chars[mt_rand(0, $last_index)];
  24. 	}
  25. 	return $str;
  26. }
  27.  
  28. //How to use
  29. $length = 20;//The string length
  30. //$random_lower: random lowercase alphabet chars, something like: rswcjanzybtaxranszxm
  31. $random_lower = random_chars($length);
  32. //$random_case: random lowercase and uppercase alphabet chars, something like: kTjkvrrejtuArxpNcPJR
  33. $random_case = random_chars($length, true);
  34. //$random_chars_digits: random lowercase and uppercase alphabet chars plus digits, something like: 9GY5KY8Q4wZ81Ge5UvDK
  35. $random_chars_digits = random_chars($length, true, true);
  36.  
  37. echo $random_lower . '<br />';
  38. echo $random_case . '<br />';
  39. echo $random_chars_digits;
  40. ?>

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