Send all WP emails to text files in the uploads directory

mail-to-text.php

<?php


/*
Plugin Name: Mail to Text
Description: Sends all WP emails to text files in the uploads directory
*/


if ( !function_exists( 'wp_mail' ) ) :
	/**
	 * Send mail, similar to PHP's mail
	 *
	 * A true return value does not automatically mean that the user received the
	 * email successfully. It just only means that the method used was able to
	 * process the request without any errors.
	 *
	 * Using the two 'wp_mail_from' and 'wp_mail_from_name' hooks allow from
	 * creating a from address like 'Name <email@address.com>' when both are set. If
	 * just 'wp_mail_from' is set, then just the email address will be used with no
	 * name.
	 *
	 * The default content type is 'text/plain' which does not allow using HTML.
	 * However, you can set the content type of the email by using the
	 * 'wp_mail_content_type' filter.
	 *
	 * The default charset is based on the charset used on the blog. The charset can
	 * be set using the 'wp_mail_charset' filter.
	 *
	 * @since 1.2.1
	 *
	 * @uses PHPMailer
	 *
	 * @param string|array $to Array or comma-separated list of email addresses to send message.
	 * @param string $subject Email subject
	 * @param string $message Message contents
	 * @param string|array $headers Optional. Additional headers.
	 * @param string|array $attachments Optional. Files to attach.
	 * @return bool Whether the email contents were sent successfully.
	 */
	function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) {
		static $increment = 0;
		// Compact the input, apply the filters, and extract them back out

		/**
		 * Filter the wp_mail() arguments.
		 *
		 * @since 2.2.0
		 *
		 * @param array $args A compacted array of wp_mail() arguments, including the "to" email,
		 *                    subject, message, headers, and attachments values.
		 */
		$atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) );

		if ( isset( $atts['to'] ) ) {
			$to = $atts['to'];
		}

		if ( isset( $atts['subject'] ) ) {
			$subject = $atts['subject'];
		}

		if ( isset( $atts['message'] ) ) {
			$message = $atts['message'];
		}

		if ( isset( $atts['headers'] ) ) {
			$headers = $atts['headers'];
		}

		// Headers
		if ( empty( $headers ) ) {
			$headers = array();
		} else {
			if ( !is_array( $headers ) ) {
				// Explode the headers out, so this function can take both
				// string headers and an array of headers.
				$tempheaders = explode( "\n", str_replace( "\r\n", "\n", $headers ) );
			} else {
				$tempheaders = $headers;
			}
			$headers = array();
			$cc = array();
			$bcc = array();

			// If it's actually got contents
			if ( !empty( $tempheaders ) ) {
				// Iterate through the raw headers
				foreach ( (array) $tempheaders as $header ) {
					if ( strpos($header, ':') === false ) {
						if ( false !== stripos( $header, 'boundary=' ) ) {
							$parts = preg_split('/boundary=/i', trim( $header ) );
							$boundary = trim( str_replace( array( "'", '"' ), '', $parts[1] ) );
						}
						continue;
					}
					// Explode them out
					list( $name, $content ) = explode( ':', trim( $header ), 2 );

					// Cleanup crew
					$name    = trim( $name    );
					$content = trim( $content );

					switch ( strtolower( $name ) ) {
						// Mainly for legacy -- process a From: header if it's there
						case 'from':
							$bracket_pos = strpos( $content, '<' );
							if ( $bracket_pos !== false ) {
								// Text before the bracketed email is the "From" name.
								if ( $bracket_pos > 0 ) {
									$from_name = substr( $content, 0, $bracket_pos - 1 );
									$from_name = str_replace( '"', '', $from_name );
									$from_name = trim( $from_name );
								}

								$from_email = substr( $content, $bracket_pos + 1 );
								$from_email = str_replace( '>', '', $from_email );
								$from_email = trim( $from_email );

								// Avoid setting an empty $from_email.
							} elseif ( '' !== trim( $content ) ) {
								$from_email = trim( $content );
							}
							break;
						case 'content-type':
							if ( strpos( $content, ';' ) !== false ) {
								list( $type, $charset_content ) = explode( ';', $content );
								$content_type = trim( $type );
								if ( false !== stripos( $charset_content, 'charset=' ) ) {
									$charset = trim( str_replace( array( 'charset=', '"' ), '', $charset_content ) );
								} elseif ( false !== stripos( $charset_content, 'boundary=' ) ) {
									$boundary = trim( str_replace( array( 'BOUNDARY=', 'boundary=', '"' ), '', $charset_content ) );
									$charset = '';
								}

								// Avoid setting an empty $content_type.
							} elseif ( '' !== trim( $content ) ) {
								$content_type = trim( $content );
							}
							break;
						case 'cc':
							$cc = array_merge( (array) $cc, explode( ',', $content ) );
							break;
						case 'bcc':
							$bcc = array_merge( (array) $bcc, explode( ',', $content ) );
							break;
						default:
							// Add it to our grand headers array
							$headers[trim( $name )] = trim( $content );
							break;
					}
				}
			}
		}

		// From email and name
		// If we don't have a name from the input headers
		if ( !isset( $from_name ) )
			$from_name = 'WordPress';

		/* If we don't have an email from the input headers default to wordpress@$sitename
		 * Some hosts will block outgoing mail from this address if it doesn't exist but
		 * there's no easy alternative. Defaulting to admin_email might appear to be another
		 * option but some hosts may refuse to relay mail from an unknown domain. See
		 * https://core.trac.wordpress.org/ticket/5007.
		 */

		if ( !isset( $from_email ) ) {
			// Get the site domain and get rid of www.
			$sitename = strtolower( $_SERVER['SERVER_NAME'] );
			if ( substr( $sitename, 0, 4 ) == 'www.' ) {
				$sitename = substr( $sitename, 4 );
			}

			$from_email = 'wordpress@' . $sitename;
		}

		/**
		 * Filter the email address to send from.
		 *
		 * @since 2.2.0
		 *
		 * @param string $from_email Email address to send from.
		 */
		$from_email = apply_filters( 'wp_mail_from', $from_email );

		/**
		 * Filter the name to associate with the "from" email address.
		 *
		 * @since 2.3.0
		 *
		 * @param string $from_name Name associated with the "from" email address.
		 */
		$from_name = apply_filters( 'wp_mail_from_name', $from_name );

		// Set destination addresses
		if ( !is_array( $to ) ) {
			$to = explode( ',', $to );
		}

		// $from_email
		// $from_name
		// $to
		// $subject
		// $message
		// $cc
		// $bcc

		$upload_dir = wp_upload_dir();
		$mail_dir = trailingslashit( $upload_dir['basedir'] ) . 'emails/';
		wp_mkdir_p( $mail_dir );
		$timestamp = date( 'Ymd.His');
		$filename = $timestamp . '.' . $increment++ . '.txt';
		$file = new SplFileObject( $mail_dir . $filename, 'w' );
		$file->fwrite( sprintf( "Subject: %s\n", $subject ) );
		$file->fwrite( sprintf( "From: %s <%s>\n", $from_name, $from_email ) );
		$file->fwrite( sprintf( "To: %s\n", implode(', ', $to ) ) );
		if ( !empty( $cc ) ) {
			$file->fwrite( sprintf( "Cc: %s\n", implode(', ', $cc ) ) );
		}
		if ( !empty( $bcc ) ) {
			$file->fwrite( sprintf( "Bcc: %s\n", implode(', ', $bcc ) ) );
		}
		foreach( $headers as $key => $value ) {
			$file->fwrite( sprintf( "%s: %s\n", $key, $value ) );
		}
		$file->fwrite( sprintf( "\n\n%s\n", $message ) );

		$file = null;
	}
endif;