ftp_login()

(PHP 4, PHP 5, PHP 7)

说明

ftp_login(resource $ftp_stream,string $username,string $password): bool

使用用户名和密码登录入给定的 FTP 连接。

参数

$ftp_stream: FTP 连接的链接标识符。
$username: 用户名（USER）。
$password: 密码（PASS）。

返回值

成功时返回TRUE，或者在失败时返回FALSE。如果登录失败，PHP 会抛出一个警告。

范例

ftp_login()例子

<?php
                     
$ftp_server = "ftp.example.com";
$ftp_user = "foo";
$ftp_pass = "bar";
// 设置一个连接或失败时退出
$conn_id = ftp_connect($ftp_server) or die("Couldn't connect to $ftp_server"); 
// 尝试登录
if (@ftp_login($conn_id, $ftp_user, $ftp_pass)) {
    echo "Connected as $ftp_user@$ftp_server\n";
} else {
    echo "Couldn't connect as $ftp_user\n";
}
// 关闭连接
ftp_close($conn_id);  
?>

To suppress the PHP warning, just prepend the function with the error suppression character @. I'm usually against error suppression, but apparently some genius thought it was a good idea to really drive the point home that you have a bad login. Returning false wasn't enough?
if( ! @ftp_login( $connection, 'USERNAME', 'PASSWORD' ) ){
    die( 'Bad login, but no PHP warning thrown.');
}

from: http://www.ietf.org/rfc/rfc1635.txt
"What is Anonymous FTP?
"...
"Traditionally, this special anonymous user account accepts any string as a password, although it is common to use either the password "guest" or one's electronic mail (e-mail) address. Some archive sites now explicitly ask for the user's e-mail address and will not allow login with the "guest" password. Providing an e-mail address is a courtesy that allows archive site operators to get some idea of who is using their services. "
So your code would be:
<?php
ftp_login('ftp.example.com', 'anonymous', 'user@example.com');
?>
If a blank password works, you might have a default password set in your php.ini

Note that to make an anonymous ftp connection, you need to specify "anonymous" as the username and "" (empty string) as the password.
Example:
<?php
ftp_login('ftp.example.com', 'anonymous', '');
?>

If you want to remove the warning of a bad connection with handled error activated just add before :
set_error_handler("my_error_function", E_ALL & !E_WARNING);
and after the function :
set_error_handler("my_error_function", E_ALL);