Redirect Logged in Users on pages with [lifterlms_login] shortcode

llms-login-shortcode-redirect-loggedin.php

<?php // Do not copy this line

// Copy from under this line and paste into your child theme's functions.php

add_action( 'template_redirect', 'llms_redirect_logged_in_on_login_shortcode' );

function llms_redirect_logged_in_on_login_shortcode(){

	// don't do anything if a user is not logged in
	if( ! is_user_logged_in() ){
		return;
	}

	// don't do anything on non-singular screens
	if( ! is_singular() ){
		return;
	}
	
	global $post;
	
	// don't do anything on a post with no login shortcode
	if( ! has_shortcode( $post->post_content, 'lifterlms_login') ){
		return;
	}
	
	/* 
	 * if we've reached here, this is a logged in user
	 *  on a singular post type that contains the shortcode lifterlms_login
	 */
	
	// get the loggedin_redirect attribute
	preg_match('/\[lifterlms_login.* loggedin_redirect=\"(.*)\".*\]/iU', $post->post_content, $result);
	
	// don't do anything if the attribute is not found
	if( empty( $result ) || ! is_array( $result ) ){
		return;
	}
	
	// if we've reached here, the loggedin_redirect parameter is set
	
	// don't do anything if the url is not valid
	if ( filter_var( $url, FILTER_VALIDATE_URL ) === false ) {
		return;
	}
	
	// everything cool, let's redirect!
	wp_safe_redirect( $url );
	exit;
	
}