How to upload a file via ftp in PHP?

Question

I have a form with html browse type and a submit button. I chose a file using browse button and submit the form. On form submission following code is called.

$conn_id="myid";
$conn_id = ftp_connect ( 'server' );
$ftp_user_name="username";
$ftp_user_pass="password";

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

// check connection
if ((! $conn_id ) || (! $login_result )) {
    echo "FTP connection has failed!" ;
    exit;

} else {
    echo "Connected to for user $ftp_user_name" ;
} 

// upload the file
$upload = ftp_put( $conn_id, "images/signatures/" . $fileName , $_FILES['tmp_name'] , FTP_BINARY );

// check upload status
if(!$upload){
    echo "FTP upload has failed!" ;
} else {
    echo "Successfully Uploaded." ;
}

But it produce the following warning:

Warning: ftp_put(): Filename cannot be empty in /var/www/echdp/_ProviderSignature.php on line 70 FTP upload has failed!

But when I hard code the source path in above code then it upload the file on server:

$upload = ftp_put( $conn_id, "images/signatures/myfile.txt" , "/var/www/images/hello.txt" , FTP_BINARY );

Answer 1

Obviously $_FILES['tmp_name'] does not contain the filename. Try print_r($_FILES) to see what it contains. Also, use multipart/form-data as your form enctype.

Answer 2

Example of html code with enctype:

<form action="upload_file.php" method="post" enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="myfile" id="file" /> 
<br />
<input type="submit" name="submit" value="Submit" />
</form>

Do you have enctype in Form tag? Without the attribute your file won't be send.

For debugging of $_FILES array. Try

var_dump($_FILES);

to see if the data are correct.

Your variable:

$_FILES['tmp_name'] 

is used wrongly because $_FILES contain files not a one file. Therefore you should write:

$_FILES['your-name-in-html-form']['tmp_name'] // your-name-in-html-form = myfile in the example above

Have a look on the example: http://www.zymic.com/tutorials/php/creating-a-file-upload-form-with-php/

Answer 3

$_FILES['tmp_name'] 

isn't name of your file. It is stored in:

$_FILES['inputname']['tmp_name']

where inputname is name of your field. Also check your form for enctype ="multipart/form-data".

Be aware of simply putting on your server everything that user can send - if there is access to uploaded files by http (like http://yoursite/images/signatures/uploadedfile.xxx) someone can put .php files on your server and execute it !