Description:
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As title, when I try to use the ftp_get function to develop my project. I also got the error message.

When I refer the PHP official doc, it seems that the ftp_get can accept the three parameters expect, not 4. Is the official doc wrong?

PHP official doc: http://php.net/manual/en/function.ftp-get.php

Test script:
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<?php

// define some variables
$local_file = 'local.zip';
$server_file = 'server.zip';

// set up basic connection
$conn_id = ftp_connect($ftp_server);

// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

// try to download $server_file and save to $local_file
if (ftp_get($conn_id, $local_file, $server_file)) {
    echo "Successfully written to $local_file\n";
} else {
    echo "There was a problem\n";
}

// close the connection
ftp_close($conn_id);


Expected result:
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No error

Actual result:
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PHP Warning: ftp_get() expects at least 4 parameters, 3 given