How to determine if a post has attached images?

Question

I would like to know how I can determine if a post/page has an image gallery (not documents/videos etc)? I am not talking about gallery shortcode as shown here Check if post/page has gallery?

so that

if (has_gallery = true){

  //Do Something
}

else {
  // Do Something else
}

Answer 1

You could use get_posts and search for image attachments.

<?php
$images = get_posts(array(
    'post_parent'    => $the_parent_to_check, // whatever this is
    'post_type'      => 'attachment', // attachments
    'post_mime_type' => 'image', // only image attachments
    'post_status'    => 'inherit', // attachments have this status
));

if($images)
{
     // has images
}
else
{
     // no images. :(
}

Might be more efficient to write a custom SQL query to check for the count. Depends on whether you want to do something with the attachment posts or not.

Answer 2

To test if a post has a gallery write a small helper function:

function has_gallery( $post = NULL )
{
    if ( ! is_null( $post ) )
        $post = get_post( $post );

    if ( ! $post )
    {
        if ( ! isset ( $GLOBALS['post'] ) )
            return FALSE;

        $post = $GLOBALS['post'];
    }

    return FALSE !== strpos( $post->post_content, '[gallery' );
}

Usage:

if ( has_gallery() ) 
{
    // do something
}

Note that a post with a gallery doesn’t necessary has attachments: You can create a gallery with images that are attached to other posts.