Adding String Attachments (AddStringAttachment) with wp_mail (part 2)

functions.php

<?php

add_action( 'phpmailer_init', '_add_string_attachments' );
function _add_string_attachments( $phpmailer ) {
	// the previous attachment will fail since it's not an actual file
	// we will use the error to attach it as a string
	if ( '' !== $phpmailer->ErrorInfo ) {
		
		// error info
		$error_info = $phpmailer->ErrorInfo;
		$translations = $phpmailer->getTranslations();
		
		// See if there was an error attaching something to the email
		if ( false !== stripos( $error_info, $translations['file_access'] ) ) {
			// remove the messaging
			$attachment_string = str_replace( $translations['file_access'], '', $error_info );
				
			// the result will be the json encoded string that was attempted to be attached by default
			$attachment = json_decode( $attachment_string );
			
			// sanity check to see if there is an actual id that we're looking for
			if ( isset( $attachment->pdf_doc_attachment_id ) ) {
				
				// get the doc id so that you can create the content string for the attachment	
				$doc_id = $attachment->pdf_doc_attachment_id;

				// do something to create the string attachment
				$file_name = 'stuff.pdf';
				$pdf_string = 'stuff';

				try {
				
					$phpmailer->AddStringAttachment( $pdf_string, $file_name, 'base64', 'application/pdf' );
				
				} catch ( phpmailerException $e ) {
				
					continue;
				
				}
			}
		}
	}
}