discord.php

<?php

/**
 * Send_message_to_discord
 *
 * @param  string $message The message to send.
 *
 * @return void
 */
function send_message_to_discord( $message = 'undefined' ) {

	// Get your webhook URL from Discord.
	$url = 'https://discordapp.com/api/webhooks/your-webhook-id-here';
	$current_date = gmdate( 'l F dS Y h:i:sa' );

	$data = array(
		'content' => $message . ' - ' . $current_date
	);

	// use key 'http' even if you send the request to https://...
	$options = array(
		'http' => array(
			'header'  => 'Content-Type: application/json',
			'method'  => 'POST',
			'content' => json_encode( $data ),
		),
	);
	$context = stream_context_create( $options );
	$result  = file_get_contents( $url, false, $context );

}
add_action( 'wp_ajax_discord_message', 'send_message_to_discord' );
add_action( 'wp_ajax_nopriv_discord_message', 'send_message_to_discord' );