PDF+XML functions

functions.php

<?php
/* Usage Instructions
 * [get-pdf-link] will return a raw link to the first PDF attachment to the post/page
 *
 * [pdf-content type="title|content"] "title" will return the Title of the PDF, which is referenced as "Root" in the XML document. 
 * ...continued: "content" will return the <Story> of the XML file, which is the top paragraph as assigned during PDF creation.
 */
 
add_filter('upload_mimes', 'custom_upload_xml');
 
function custom_upload_xml($mimes) {
    $mimes = array_merge($mimes, array('xml' => 'application/xml'));
    return $mimes;
}

add_filter( 'the_excerpt', 'shortcode_unautop');
add_filter( 'the_excerpt', 'do_shortcode');

function pdf_link(){

  // Added otherwise it'll throw "Undefined variable" & "Trying to get property of non-object" errors
	global $post;
	
	$args = array( 'post_type' => 'attachment', 'posts_per_page' => -1, 'post_status' => null, 'post_parent' => $post->ID );
	$attachments = get_posts( $args );
	if ( $attachments ) {
	    foreach ( $attachments as $attachment )
	    {
	        if( strpos( wp_get_attachment_url( $attachment->ID ) , '.pdf') )
	        {
				return wp_get_attachment_url( $attachment->ID );
	        }
	
	    }
	}
	
}

add_shortcode('get-pdf-link','pdf_link');

function pdf_content($atts){

	extract(shortcode_atts(array(
    'type' => 'title'
    ), $atts));
    
    // Added otherwise it'll throw "Undefined variable" & "Trying to get property of non-object" errors
	  global $post;
    
		$args = array( 'post_type' => 'attachment', 'posts_per_page' => -1, 'post_status' => null, 'post_parent' => $post->ID );
	  $attachments = get_posts( $args );
  	if ( $attachments ) {
  	    foreach ( $attachments as $attachment )
  	    {
  	        if( strpos( wp_get_attachment_url( $attachment->ID ) , '.xml') )
  		        {
  			        $url = wp_get_attachment_url( $attachment->ID );
  			        $xml = file_get_contents($url);
  			        $xml = simplexml_load_string($xml);
  
  						if ($type == 'title') {
  							$final = $xml->Root;
  						} else if ( $type == 'content') {
  							$final = $xml->Story;
  						}
  						else { $final = ''; }
  						
  						return $final;
  		        }
  	
  	    }
  	}
	
}

add_shortcode('pdf-content','pdf_content');