I'm using the following function to generate a random string:
function randstring($minasc = 32,$maxasc = 255,$minlength = 0,$maxlength
= 0){
//If maximum length is lower than minimum length, return string
representation of false
if($maxlength != 0 and $minlength != 0 and $minlength > $maxlength){
return '';
}
//Initialize $return
$return = '';
//Start infinite while loop, which will be exited with break;
while(true){
//Add another random character to $return
$return = $return.chr(mt_rand($minasc,$maxasc));
//Break out of loop when it's time to
if((strlen($return) == $maxlength) or (mt_rand(1,2) == 2 and
(strlen($return) >= $minlength or $minlength == 0) and (strlen($return)
<= $maxlength or $maxlength == 0))){
break;
}
}
//Return the value of $return
return $return;
}
But when I run it with:
randstring(65,90,4,4);
and I check how many strings it generates before reaching a certain
string, some strings take much longer than others. Is this just a
problem with using pseudo-random numbers, or is there a better way to
randomize this function?
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