string $file - The file name or the data itself
string $c_type - The content type of the image or file.
string $name - The suggested file name for the data. Only used, if $file contains data.
boolean $isfile - Whether $file is a file name or not.
string $encoding - Type of transfer encoding to use for the file data. Defaults is "base64". For text based files (eg. scripts/html etc.) this could be given as "quoted-printable".
Table 46-1. Possible PEAR_Error values
| Error code | Error message | Reason | Solution |
|---|---|---|---|
| NULL | "File is not readable file_name" | The file was not found or the script has not enough rights to access the file. | Check the file name and path. Check user and file permissions. |
| NULL | "Could not open file_name" | The file is already opened and exclusivly locked by another application. | In the most cases a programm opens the file for writing. addAttachment() does no file locking, so this problem is not caused by competitve callings of this function. |