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Replying to Php Random Text Generating
Topic Summary
Quatrux
Posted 23 February 2010 - 07:13 AM
The iGuest way which you prefer has one bad thing, that it's using md5, which you can substr or something to make it use less symbols, but the problem then is that you're stuck only with these letters:
abcdef1234567890
where with my method and 8ennett method you can include anything you want, even #$%^ symbols, which can be good for a CAPTCHA or for a SMS code or for any code which needs to be short and have a lot of different variations to not generate the same.
Those long codes which are lets say 16 letters are good for generating confirmation codes, where you don't really care about it, those kind of codes usually are copied and pasted or clicked on.
abcdef1234567890
where with my method and 8ennett method you can include anything you want, even #$%^ symbols, which can be good for a CAPTCHA or for a SMS code or for any code which needs to be short and have a lot of different variations to not generate the same.
Those long codes which are lets say 16 letters are good for generating confirmation codes, where you don't really care about it, those kind of codes usually are copied and pasted or clicked on.
Quatrux
Posted 30 October 2009 - 01:06 PM
To generate some random characters I use a bit different method, it might be slower, but if it's for a personal site or a site not as big as Wikipedia you can use this code, even though it's not as slow as you can imagine, it works normally and in my opinion is a bit more clear to people who will start editing it:
In the function variable $chars = '..'; I did not include all the letters, because I use this function for sending SMS code to activate some feature on a site and some letters does not feet, due to they look similar, like l can look like 1 and etc. if they are one to another, of course if you'll add all the alphabet and maybe even other symbols and even uppercase letters you'll get a much bigger probability for it to be different for example looping it million times and of course making more than 6 or 12 characters/length will have more different variations.
function gen_chars($length = 6) {
// Available characters
$chars = '0123456789abcdefghjkmnoprstvwxyz';
$Code = '';
// Generate code
for ($i = 0; $i < $length; ++$i)
{
$Code .= substr($chars, (((int) mt_rand(0,strlen($chars))) - 1),1);
}
return $Code;
}
// Usage
$var = gen_chars(12);
echo $var;In the function variable $chars = '..'; I did not include all the letters, because I use this function for sending SMS code to activate some feature on a site and some letters does not feet, due to they look similar, like l can look like 1 and etc. if they are one to another, of course if you'll add all the alphabet and maybe even other symbols and even uppercase letters you'll get a much bigger probability for it to be different for example looping it million times and of course making more than 6 or 12 characters/length will have more different variations.
marijnnn
Posted 18 February 2005 - 09:13 AM
another way would to make a table with all the allowed signs
a,b,c,d,... ,A,B,C,D,... 1,2,3,...
let's say you get a table of 80 fields.
then you could just pick a random field
you could do this in various way: just rand(0,80)
if you have doubts about the randomness of rand, you could rand a random times and then start picking your letters
$i = rand(0,20);
for ($j=0; $j<$i;$j++) rand(0,80);
for ($i=0; $i<$passlenght;$i++)
$pw =$pw.$array[rand(0,80)];
or you could use srand
or you could go like rand(0,846854354)%80
anything that makes you feel safer
a,b,c,d,... ,A,B,C,D,... 1,2,3,...
let's say you get a table of 80 fields.
then you could just pick a random field
you could do this in various way: just rand(0,80)
if you have doubts about the randomness of rand, you could rand a random times and then start picking your letters
$i = rand(0,20);
for ($j=0; $j<$i;$j++) rand(0,80);
for ($i=0; $i<$passlenght;$i++)
$pw =$pw.$array[rand(0,80)];
or you could use srand
or you could go like rand(0,846854354)%80
anything that makes you feel safer
