Catch Expression in WordPress Action Hook - php

Question

Using WordPress, I am trying to hook an action so when an email is sent, my PHP script is executed and sends a notification through LINE messenger service.
I have built the PHP script, which runs successfully, however I am unable to parse expressions within the email body to add to the notification.
My PHP script which executives on action 'rpress_email_send_after'
<?php
/*
Plugin Name: ***
Plugin URI: ***
description: >-
LINE Notification extension
Version: 1.2
Author: ***
Author URI: ***
License: GPL2
*/
function dcart_line() {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.line.me/v2/bot/message/multicast');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "{\n \"to\":
[\"***LINE ID HERE***\"],\n \"messages\":[\n {\n
\"type\":\"text\",\n \"text\":\"Order\"$to\n }\n \n ]\n}");
$headers = array();
$headers[] = 'Content-Type: application/json';
$headers[] = 'Authorization: Bearer
{***BEARER TOKEN****}';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$result = curl_exec($ch);
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
curl_close($ch);
}
add_action( 'rpress_email_send_after', 'dcart_line' );
?>
Wordpress Template Page I am trying to take parameters from:
$To
$Subject
$Message
// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;
/**
* RPRESS_Emails Class
*
* #since 1.0.0
*/
class RPRESS_Emails {
/**
* Holds the from address
*
* #since 1.0.0
*/
private $from_address;
/**
* Holds the from name
*
* #since 1.0.0
*/
private $from_name;
/**
* Holds the email content type
*
* #since 1.0.0
*/
private $content_type;
/**
* Holds the email headers
*
* #since 1.0.0
*/
private $headers;
/**
* Whether to send email in HTML
*
* #since 1.0.0
*/
private $html = true;
/**
* The email template to use
*
* #since 1.0.0
*/
private $template;
/**
* The header text for the email
*
* #since 2.1
*/
private $heading = '';
/**
* Get things going
*
* #since 1.0.0
*/
public function __construct() {
if ( 'none' === $this->get_template() ) {
$this->html = false;
}
add_action( 'rpress_email_send_before', array( $this, 'send_before' ) );
add_action( 'rpress_email_send_after', array( $this, 'send_after' ) );
}
/**
* Set a property
*
* #since 1.0.0
*/
public function __set( $key, $value ) {
$this->$key = $value;
}
/**
* Get a property
*
* #since 1.0.0.9
*/
public function __get( $key ) {
return $this->$key;
}
/**
* Get the email from name
*
* #since 1.0.0
*/
public function get_from_name() {
if ( ! $this->from_name ) {
$this->from_name = rpress_get_option( 'from_name', get_bloginfo( 'name' ) );
}
return apply_filters( 'rpress_email_from_name', wp_specialchars_decode( $this-
>from_name ), $this );
}
/**
* Get the email from address
*
* #since 1.0.0
*/
public function get_from_address() {
if ( ! $this->from_address ) {
$this->from_address = rpress_get_option( 'from_email' );
}
if( empty( $this->from_address ) || ! is_email( $this->from_address ) ) {
$this->from_address = get_option( 'admin_email' );
}
return apply_filters( 'rpress_email_from_address', $this->from_address, $this );
}
/**
* Get the email content type
*
* #since 1.0.0
*/
public function get_content_type() {
if ( ! $this->content_type && $this->html ) {
$this->content_type = apply_filters( 'rpress_email_default_content_type',
'text/html', $this );
} else if ( ! $this->html ) {
$this->content_type = 'text/plain';
}
return apply_filters( 'rpress_email_content_type', $this->content_type, $this );
}
/**
* Get the email headers
*
* #since 1.0.0
*/
public function get_headers() {
if ( ! $this->headers ) {
$this->headers = "From: {$this->get_from_name()} <{$this-
>get_from_address()}>\r\n";
$this->headers .= "Reply-To: {$this->get_from_address()}\r\n";
$this->headers .= "Content-Type: {$this->get_content_type()}; charset=utf-
8\r\n";
}
return apply_filters( 'rpress_email_headers', $this->headers, $this );
}
/**
* Retrieve email templates
*
* #since 1.0.0
*/
public function get_templates() {
$templates = array(
'default' => __( 'Default Template', 'restropress' ),
'none' => __( 'No template, plain text only', 'restropress' )
);
return apply_filters( 'rpress_email_templates', $templates );
}
/**
* Get the enabled email template
*
* #since 1.0.0
*
* #return string|null
*/
public function get_template() {
if ( ! $this->template ) {
$this->template = rpress_get_option( 'email_template', 'default' );
}
return apply_filters( 'rpress_email_template', $this->template );
}
/**
* Get the header text for the email
*
* #since 1.0.0
*/
public function get_heading() {
return apply_filters( 'rpress_email_heading', $this->heading );
}
/**
* Parse email template tags
*
* #since 1.0.0
* #param string $content
*/
public function parse_tags( $content ) {
// The email tags are parsed during setup for purchase receipts and sale
notifications
// Onoce tags are not restricted to payments, we'll expand this.
return $content;
}
/**
* Build the final email
*
* #since 1.0.0
* #param string $message
*
* #return string
*/
public function build_email( $message ) {
if ( false === $this->html ) {
return apply_filters( 'rpress_email_message', wp_strip_all_tags( $message ),
$this );
}
$message = $this->text_to_html( $message );
ob_start();
rpress_get_template_part( 'emails/header', $this->get_template(), true );
/**
* Hooks into the email header
*
* #since 1.0.0
*/
do_action( 'rpress_email_header', $this );
if ( has_action( 'rpress_email_template_' . $this->get_template() ) ) {
/**
* Hooks into the template of the email
*
* #param string $this->template Gets the enabled email template
* #since 1.0.0
*/
do_action( 'rpress_email_template_' . $this->get_template() );
} else {
rpress_get_template_part( 'emails/body', $this->get_template(), true );
}
/**
* Hooks into the body of the email
*
* #since 1.0.0
*/
do_action( 'rpress_email_body', $this );
rpress_get_template_part( 'emails/footer', $this->get_template(), true );
/**
* Hooks into the footer of the email
*
* #since 1.0.0
*/
do_action( 'rpress_email_footer', $this );
$body = ob_get_clean();
$message = str_replace( '{email}', $message, $body );
return apply_filters( 'rpress_email_message', $message, $this );
}
/**
* Send the email
* #param string $to The To address to send to.
* #param string $subject The subject line of the email to send.
* #param string $message The body of the email to send.
* #param string|array $attachments Attachments to the email in a format supported by
wp_mail()
* #since 1.0.0
*/
public function send( $to, $subject, $message, $attachments = '' ) {
if ( ! did_action( 'init' ) && ! did_action( 'admin_init' ) ) {
_doing_it_wrong( __FUNCTION__, __( 'You cannot send email with RPRESS_Emails
until init/admin_init has been reached', 'restropress' ), null );
return false;
}
/**
* Hooks before the email is sent
*
* #since 1.0.0
*/
do_action( 'rpress_email_send_before', $this );
$subject = $this->parse_tags( $subject );
$message = $this->parse_tags( $message );
$message = $this->build_email( $message );
$attachments = apply_filters( 'rpress_email_attachments', $attachments, $this );
$sent = wp_mail( $to, $subject, $message, $this->get_headers(), $attachments
);
$log_errors = apply_filters( 'rpress_log_email_errors', true, $to, $subject,
$message );
if( ! $sent && true === $log_errors ) {
if ( is_array( $to ) ) {
$to = implode( ',', $to );
}
$log_message = sprintf(
__( "Email from RestroPress failed to send.\nSend time: %s\nTo: %s\nSubject:
%s\n\n", 'restropress' ),
date_i18n( 'F j Y H:i:s', current_time( 'timestamp' ) ),
$to,
$subject
);
error_log( $log_message );
}
/**
* Hooks after the email is sent
*
* #since 1.0.0
*/
do_action( 'rpress_email_send_after', $this );
return $sent;
}
/**
* Add filters / actions before the email is sent
*
* #since 1.0.0
*/
public function send_before() {
add_filter( 'wp_mail_from', array( $this, 'get_from_address' ) );
add_filter( 'wp_mail_from_name', array( $this, 'get_from_name' ) );
add_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );
}
/**
* Remove filters / actions after the email is sent
*
* #since 1.0.0
*/
public function send_after() {
remove_filter( 'wp_mail_from', array( $this, 'get_from_address' ) );
remove_filter( 'wp_mail_from_name', array( $this, 'get_from_name' ) );
remove_filter( 'wp_mail_content_type', array( $this, 'get_content_type' ) );
// Reset heading to an empty string
$this->heading = '';
}
/**
* Converts text to formatted HTML. This is primarily for turning line breaks into <p>
and <br/> tags.
*
* #since 1.0.0
*/
public function text_to_html( $message ) {
if ( 'text/html' == $this->content_type || true === $this->html ) {
$message = apply_filters( 'rpress_email_template_wpautop', true ) ? wpautop(
$message ) : $message;
$message = apply_filters( 'rpress_email_template_make_clickable', true ) ?
make_clickable( $message ) : $message;
$message = str_replace( '&', '&', $message );
}
return $message;
}
}

Answer 1

function dcart_line() {
add_action( 'rpress_email_send_after', 'dcart_line' );
do_action( 'rpress_email_send_after', $this );
You are sending $this to the action, but you don't accept it as a parameter in the function hooked to the action.
If you want to get $this in the function, then have a parameter for it to be in the function definition:
function dcart_line( $var ) {
add_action( 'rpress_email_send_after', 'dcart_line', 10, 1 );
do_action( 'rpress_email_send_after', $this );
Then, in your function, $var will be $this.
Also, you appear to be using $to, but not sending it to the action to be passed to the function. So, maybe you need to send that separately.
function dcart_line( $var, $to ) {
add_action( 'rpress_email_send_after', 'dcart_line', 10, 2 );
do_action( 'rpress_email_send_after', $this, $to );