Attached email backup file as noname

[injiniero]

After wp 5.5 update the attached backup file sent by email arrives with noname

[hgdrn]

Same problem here. Backup worked, updated WP to 5.5, e-mail attachements are broken.

Previous: X-Mailer: PHPMailer 5.2.27
Current: X-Mailer: PHPMailer 6.1.6

Previous:
Content-Type: multipart/mixed;
boundary="b1_56d2a9d3c58c5306a23e188ad7e0b57b"

Current:
Content-Type: multipart/mixed; charset=

Guess: Missing "boundary" in the e-mail body. Thunderbird doesn't show any attachemt, K9-Mail/Android shows an error.

[hgdrn]

I've found the problem: PHPMailer has moved to another directory thus the "require_once" fails and the old method is used for sending the e-mail (which is buggy). The needed changes are two additional lines of code and one change to an existing line of code. Details tomorrow, if anybody is interrested in it.

[hgdrn]

First: PHPMailer has moved to a different location. In function send_mail() one has to include it

		if ( !is_object( $phpmailer ) || ( strtolower(get_class( $phpmailer )) != 'phpmailer' ) ) {
			// <fix for wp5.5>
			if ( file_exists( ABSPATH . WPINC . '/PHPMailer/PHPMailer.php' ) )
				require_once ABSPATH . WPINC . '/PHPMailer/PHPMailer.php';
			// </fix for wp5.5>
			if ( file_exists( ABSPATH . WPINC . '/class-phpmailer.php' ) )
				require_once ABSPATH . WPINC . '/class-phpmailer.php';

Second: strtolower(get_class( $phpmailer )) provides "phpmailer\phpmailer\phpmailer" thus the if-statement fails

		// try to use phpmailer directly (WP 2.2+)
		// <fix for wp5.5>
		// if ( is_object( $phpmailer ) && ( strtolower(get_class( $phpmailer )) == 'phpmailer' ) ) {
		if ( is_object( $phpmailer )
			&& (
		    	( strtolower(get_class( $phpmailer )) == 'phpmailer' ) 
		    	||
			( strtolower(get_class( $phpmailer )) == 'phpmailer\phpmailer\phpmailer' )
		 	)
		) {	
		// </fix for wp5.5>

Plugin works for me again with these changes. Just trying to provide a pull request now, please stand by.

[injiniero]

Thank you, hgdrn. It works!