Pull images from the gallery

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I am building a template where wordpress is being used primarily as an image CMS, I am pulling the first image from the content section of each post. 

<img src="<?php echo grab_image() ?>" />

function grab_image() {
global $post, $posts;
$first_img = '';
ob_start();
ob_end_clean();
$output = preg_match_all('/<img.+src=['"]([^'"]+)['"].*>/i', $post->post_content, $matches);
$first_img = $matches [1] [0];

if(empty($first_img)){
$first_img = "";
}
return $first_img;
}

My question is how can I, instead of grabbing it from post_content, grab the first image from the uploaded image gallery?

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So, the process to add an image would be to upload and then exit out (without inserting into post). I dont know what you call this or what to look for.. attachments? media library? The content area would be used strictly for text along with any extra meta boxes.

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2 comments

  1. Use get_children() (Codex ref):

    $images = get_children( array( 
     'post_parent' => $post->ID, 
     'post_type' => 'attachment', 
     'post_mime_type' => 'image', 
     'orderby' => 'menu_order', 
     'order' => 'ASC' 
) );

    The first image will be $images[0].

    EDIT:

    And by “first image”, I mean, the $ID of the first image, which you can use with any of the myriad image- and attachment-handling functions in WordPress. If you can clarify what you want to do with the image, I can provide more specific, further instruction.