PHP 8.1.0 RC 2 available for testing


(PHP 5, PHP 7, PHP 8)

ftp_allocAllocates space for a file to be uploaded


ftp_alloc(resource $ftp, int $size, string &$response = null): bool

Sends an ALLO command to the remote FTP server to allocate space for a file to be uploaded.


Many FTP servers do not support this command. These servers may return a failure code (false) indicating the command is not supported or a success code (true) to indicate that pre-allocation is not necessary and the client should continue as though the operation were successful. Because of this, it may be best to reserve this function for servers which explicitly require preallocation.



The link identifier of the FTP connection.


The number of bytes to allocate.


A textual representation of the servers response will be returned by reference in response if a variable is provided.

Return Values

Returns true on success or false on failure.


Example #1 ftp_alloc() example



// connect to the server
$conn_id ftp_connect('');
$login_result ftp_login($conn_id'anonymous''');

if (
ftp_alloc($conn_idfilesize($file), $result)) {
"Space successfully allocated on server.  Sending $file.\n";
} else {
"Unable to allocate space on server.  Server said: $result\n";



See Also

  • ftp_put() - Uploads a file to the FTP server
  • ftp_fput() - Uploads from an open file to the FTP server

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