Force SSL on Woocommerce pages and two additional custom pages

functions.php

<?php

/*
Author: Doug Edgington
Description: modified version of Woocomemrce SSL functionality, forces ssl on Woocommerce pages and two additional custom pages
*/
function dee_ssl_template_redirect() {
  if ( ! is_ssl() ) {
		
		if ( is_checkout() || is_account_page() || is_page(48) || is_page(64) ) {
			if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
				wp_safe_redirect( preg_replace( '|^http://|', 'https://', $_SERVER['REQUEST_URI'] ) );
				exit;
			} else {
				wp_safe_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
				exit;
			}
		}
	}
	// Break out of SSL if we leave woocommerce pages or custom pages
	elseif ( is_ssl() && $_SERVER['REQUEST_URI'] && ! is_checkout() && ! is_page( woocommerce_get_page_id('thanks') ) && ! is_ajax() && ! is_account_page() && ! is_page(48) && ! is_page(64) ) {

		if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
			wp_safe_redirect( preg_replace( '|^https://|', 'http://', $_SERVER['REQUEST_URI'] ) );
			exit;
		} else {
			wp_safe_redirect( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
			exit;
		}
	}
} //end function
add_action( 'template_redirect', 'dee_ssl_template_redirect', 1 );

?>

The original functions this was built from have since been changed.

You can now accomplish this using the filters "woocommerce_force_ssl_checkout" and "woocommerce_unforce_ssl_checkout" within your function.php or plugin.

function my_force_ssl_pages( $force_https ) {
  if( ! $force_https && is_page( array( 48, 64 ) ) ) {
    $force_https = true;
  }

  return $force_https;
}
add_filter( 'woocommerce_force_ssl_checkout', 'my_force_ssl_pages', 10, 1);

function my_unforce_ssl_pages( $force_http ) {
  if( $force_http && is_page( array( 48, 64 ) ) ) {
    $force_http = false;
  }

  return $force_http;
}
add_filter( 'woocommerce_unforce_ssl_checkout', 'my_unforce_ssl_pages', 10, 1);

There's no need to check is_ssl() here since that's done before the filters are applied.