CodingForums.com - Password, Salt, any length Random string Generator

i made this for adding salt to a password also for temporary passwords or pin numbers, could also be used for creating password reset keys i was that impressed with it i decided to share it with you all.

unique string chars or duplicated,
upper case, lowercase + numbers
Upper case + numbers
Numbers only

feel free to message me if you need help modifying it for your own needs
could easily be altered to generate lottery numbers etc
added lottery numbers generator

function:

PHP Code:


		
			
function GenCode($len,$type = 1,$uni = 0){
    
    //GenCode(length of string,$type = 1, 2 or 3,unique chars?)
    //Unique Switch 1 for on 0 or ommited for off
    //Type Switch 1 = a-z, A-Z, 0-9     Usage: GenCode(8); or GenCode(8,1);
    //Type Switch 2 = A-Z, 0-9          Usage: GenCode(10,2);
    //Type Switch 3 = 0-9               Usage: GenCode(4,3,1);
    //Type Switch 4 = 0-49               Usage: GenCode(6,4,1); <-- Lottery Numbers

    //Reset Function
    $code ='';
    //Array of chars to choose from, feel free to add more arrays
    $codestring['1'] = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9','0');
    $codestring['2'] = array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9','0');
    $codestring['3'] = array('1','2','3','4','5','6','7','8','9','0');
    $codestring['4'] = array('|1|','|2|','|3|','|4|','|5|','|6|','|7|','|8|','|9|','|10|','|11|','|12|','|13|','|14|','|15|','|16|','|17|','|18|','|19|','|20|','|21|','|22|','|23|','|24|','|25|','|26|','|27|','|28|','|29|','|30|','|31|','|32|','|33|','|34|','|35|','|36|','|37|','|38|','|39|','|40|','|41|','|42|','|43|','|44|','|45|','|46|','|47|','|48|','|49|');
    
    //see if the string should contain unique chars
    if ($uni == 1){
        //check if theres enough chars to have a unique string
        if ($len > count($codestring[$type])-1){ echo "error length too long for unique string"; exit;}
        //loop for lenght of $len NOT allowing duplicate chars
        for ($i=1; $i<=$len; $i++){
            //add char from chosen array to the end of the variable $code
            $tempx = '"'.$codestring[$type][rand(0,count($codestring[$type])-1)].'"';
            if (strstr($code, $tempx) != false){
                $i--;
            }else{
                $code .= $tempx;
            }
        }
 
    }else{
        //loop for lenght of $len allowing duplicate chars
        for ($i=1; $i<=$len; $i++){
            //add char from chosen array to the end of the variable $code
            $code .= $codestring[$type][rand(0,count($codestring[$type])-1)];
        }
    }
    //clean up the code
    $code = str_replace('"','',$code);
    $code = str_replace('|',' ',$code);
        //send $code back to where GenCode() was called from
    return $code;
}