[Resolved] Quick syntax question

[Xephon]

I see this code in a tutorial off of phpfreaks.com

function makeRandomPassword() { 
  $salt = "abchefghjkmnpqrstuvwxyz0123456789"; 
  srand((double)microtime()*1000000); 
      $i = 0; 
      while ($i <= 7) { 
            $num = rand() % 33; 
            $tmp = substr($salt, $num, 1); 
            $pass = $pass . $tmp; 
            $i++; 
      } 
      return $pass; 
} 
$random_password = makeRandomPassword(); 
echo "Random Password is $random_password"; 

and i dont know what this part does:

$pass = $pass . $tmp; 

what does the "." do? sorry but i cannot do a search for "." in the php manual lol

thx in advance.

[drew010]

it concatenates the two variables together.

$var1 = "hello";
$var2 = "there";
$var3 = $var1 . $var2; //yeilds hellothere

you can also do it with strings

$var4 = "hello" . " there";

or with mixed functions

$var5 = base64_encode($var4) . "\r\n";

i think you can find a small bit on this on the echo page.

[Xephon]

ahhh!! i kinda figured that, but i could not really find out

thx man!