ftp_put cannot upload a file to a Red hat enterprise Linux ES release 4

Dear Sir/Madam 
   
  I have the following code section and it returns else statement.  A Microsoft internet explorer version 6.0.29 is used on a Red hat enterprise Linux ES release 4. php 4.4.7 and apache 1.3.37. 
  --------------------------------------------------- 
  $uploadfile = ftp_put($ftpconnect, $destinationfile, $sourcefile, FTP_BINARY);
if ( $uploadfile ) {
echo "Uploaded file = $sourcefile to server name = $servername as file = $destinationfile.";
} else {
echo "Upload is failed to upload file = $sourcefile to server name = $servername.";
} 
  --------------------------------------------------- 
  Would you let me know what causes this problem? 
   
   
  Ms (Tina) Thieu Van Hung

       
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