Unable to the get the gallery inserted between shortcodes

Question

I am customizing this theme . I am using get_the_gallery() function to get the gallery from the custom post . I am able to do so, but when the gallery is inserted between the shortcodes...

For eg:

[two-third]

[gallery ids="18,17,8,7,6"]

[/two-third]

then i am not able to get the gallery..I am using the following code

<?php                  
    if ( get_post_gallery() ):     
       $gallery = get_post_gallery( $post, false );
       $w3_ids = explode( ",", $gallery['ids'] );               
?>                 

<?php  
    $gallery_count=1;
    foreach( $w3_ids AS $w3_id ): 
        $src = wp_get_attachment_image_src($w3_id,'full'); 
?>  
    <div class="item <?php if($gallery_count==1)echo "active"; ?>">
       <img src="<?php echo $src[0]; ?>" alt="" />
    </div>
<?php 
    $gallery_count++;
    endforeach;
    endif;
?> 

What can be done... Please help

Answer 1

I don't know why the code is not working. But this is how i did this may be helpful for some noob like me

<?php                  
    $name = get_the_content();          
    preg_match('/\[gallery ids="([^]]*)\"]/', $name, $match);                  
    $w3_ids = explode( ",", $match[1] ); 
    $gallery_count=1;
    foreach( $w3_ids AS $w3_id ): 
       $src = wp_get_attachment_image_src($w3_id,'full'); 
?>  
    <div class="item <?php if($gallery_count==1)echo "active"; ?>">
        <img src="<?php echo $src[0]; ?>" alt="" />
    </div>
<?php 
    $gallery_count++;
    endforeach;        
?>

Answer 2

<?php
    $id=the_ID();
    $gallery_count = $wpdb->get_var("SELECT COUNT(ID) FROM {$wpdb->prefix}posts WHERE post_type = 'attachment' && ID=$id");
    echo $gallery_count;
?>

I think...!!! Try this for Particular gallery.