function user_exists($username)
{
$username = sanitize($username);
//query = ;
return (mysql_result(mysql_query("SELECT COUNT('ID') FROM 'users' WHERE 'username' = '$username'") , 0) == 1) ? true : false;
}
function user_exists($username)
{
$username
阅读背景：
返回(mysql_result(mysql_query) (mysql_query(“SELECT COUNT('ID')”，用户名为“用户名”=“$username”)，0)== 1)?真:假;
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