Current Menu Item not working with $childpages - php

Question

I need to add the "active" or "current-menu-item" class to a custom childpages menu. I've tried the code below but it doesn't seem to work.
I've browsed google but can't find anything that will work!
<?php
$childpages = query_posts('orderby=menu_order&order=asc&post_type=page&post_parent=35&posts_per_page=300');
if ($childpages)
{
// Display the children content
foreach ($childpages as $post)
{
setup_postdata($post)
?>
<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" class="mezzanine-sub-title <?php echo!empty($_GET['page_id']) && $_GET['page_id'] == $post->ID ? "active" : NULL ?>">
<span><?php the_title(); ?></span>
<a>
<?php
global $post;
$src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), array(5600, 1000), false, '');
?>
<div class="mezzanine-sub-image" style="background: url(<?php echo $src[0]; ?> );border:<?php the_field('border'); ?>;">
</div>
</a>
</a>
<?php
}
}
?>
Thanks in advance

Answer 1

change query_posts to get_posts also you have invalid syntax with your <a> tag.
finally instead of using $get which is not returning anything use wp_query
so your code should be:
$childpages = get_posts('orderby=menu_order&order=asc&post_type=page&post_parent=35&posts_per_page=300');
if ($childpages)
{
// Display the children content
foreach ($childpages as $post)
{
setup_postdata($post)
?>
<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" class="mezzanine-sub-title<?php if ( $post->ID == $wp_query->post->ID ) { echo ' active'; }?>">
<span><?php the_title(); ?></span>
<?php
$src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), array(5600, 1000), false, '');
?>
<div class="mezzanine-sub-image" style="background: url(<?php echo $src[0]; ?> );border:<?php the_field('border'); ?>;">
</div>
</a>
<?php
}
}