Sending E-mail after registration?

Ok, well I need my PHP script to send a e-mail after someone enters there e-mail.

Also
Can someone help me with registration thing

I need it to give user random password then e-mail it

you can send an email by using the mail function.

you can generate a random password using the following function, taken from php.net:

PHP Code:

---

<?php
function rand_chars($c, $l, $u = FALSE) {
 if (!$u) for ($s = '', $i = 0, $z = strlen($c)-1; $i < $l; $x = rand(0,$z), $s .= $c{$x}, $i++);
 else for ($i = 0, $z = strlen($c)-1, $s = $c{rand(0,$z)}, $i = 1; $i != $l; $x = rand(0,$z), $s .= $c{$x}, $s = ($s{$i} == $s{$i-1} ? substr($s,0,-1) : $s), $i=strlen($s));
 return $s;
}
?>

---

string $c is the string of characters to use.
integer $l is how long you want the string to be.
boolean $u is whether or not a character can appear beside itself.

Examples:
rand_chars("ABCEDFG", 10) == GABGFFGCDA
rand_chars("ABCEDFG", 10, TRUE) == CBGFAEDFEC

That's a really useful function there kows, great find :).

Are you storing these in a database, or how are you planning on keeping the new logins?

I am using MySQL