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Php Random String Generator

/ Published in: PHP
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This will generate a random alpha numeric string 20 characters long.

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  1. <?
  2.  
  3. $l='a';					//Set the starting letter
  4. for($i=0;$i<26;$i++){	//Cycle through all of the letters of the alphabet a-z
  5. 	$key[$i]=$l;		//Load the array with lowercase variables at position $i
  6. 	$l++;				//Increment the letter
  7. }
  8. for($x=0;$x<5;$x++){	//Cycle through this five times. The more you cycle through this loop the more likely a number will appear.
  9. 	for($n=0;$n<10;$n++){	//Cycle through the numbers 0-9
  10. 		$key[$i]=$n;	//Load the array with number variables at position $i
  11. 		$i++;			//Increment the array key
  12. 	}
  13. }
  14. $u='A';					//Set the starting letter
  15. for($c=0;$c<26;$c++){	//Cycle through all of the letters of the alphabet A-Z
  16. 	$key[$i]=$u;		//Load the array with uppercase variables
  17. 	$i++;				//Increment the array key
  18. 	$u++;				//Increment the letter
  19. }
  20.  
  21. $i--;	//Subtract the last incrementation of $i because it's not indexed
  22.  
  23. $str='';
  24. for($strlength=0;$strlength<20;$strlength++){	//Generate the random string 20 characters long
  25. 	//$r = rand(0,$i);	//Generate a random number from the available $i interger
  26. 	$r = rand()&$i;		//Generate a random number from the available $i interger using bitwise
  27. 	$str .= $key[$r];	//Concatenate the random variable
  28. }
  29.  
  30. echo $str;	//Show the random string
  31. ?>

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