[請益] 關於php5 & Mysql5聖經
想請問一下 裡面的有個地方 我不知道為什麼作者要用這個函式說 不知道動機為何@@
ps 這是出現在電子書的874頁
<?php
//A file with the datebase host,user,password,and selected database
include_once('db_vars.inc');
//A string used for md5 encryption.You could move it to a file
//outside the web tree for more security
$supersecret_hash_padding = 'A string that is used to pad
out short strings for md5 encyption.';
$LOGIN_IN=false;
unset($LOGIN_IN); <-有人知道為什麼這裡要用unset func嗎?
func user_isloggedin(){
//This func will only work with superglobla arrays
//because $supersecret_hash_padding. $LOGGED_IN:
//Have we already run the hash checks ?
//IF so $ return the pre-set var
if (isSet($LOGGED_IN)) {
return $LOGGED_IN;
}
if ($_COOKIE['user_name'] && COOKIE['id_hash']) {
$hash = md5($_COOKIE['user_name'].$supersecrect_hash_padding);
if ($hash == $_COOKIE['id_hash']) {
return trun;
} else {
return false;
}
} else {
return false;
}
}
--
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