您可以使用great wordpress media manager. 我已经准备了一个插件，可以将PDF文件附加到noraml帖子。你可以下载它here.
php：
<?php
/*
Plugin Name: PDF Metabox
Plugin URI: https://github.com/CybMeta/cyb-pdf-metabox
Description: Displays a metabox to attach a PDF file to current post.
Author: Juan Padial
Version: 1.0.2
Author URI: http://cybmeta.com
*/
class PDF_Metabox
{
/**
* This is our constructor
*
* @return PDF_Metabox
*/
public function __construct() {
add_action( \'post_mime_types\', array( $this, \'pdf_mime_type\' ) );
add_action( \'add_meta_boxes\', array( $this, \'admin_scripts\' ), 5 );
add_action( \'add_meta_boxes\', array( $this, \'metabox_add\' ) );
add_action( \'save_post\', array( $this, \'pdf_save_postdata\') );
add_action( \'wp_ajax_refresh_pdf\', array( $this, \'refresh_pdf\' ) );
}
public function pdf_mime_type() {
$post_mime_types[\'application/pdf\'] = array( __( \'PDFs\' ), __( \'Manage PDFs\' ), _n_noop( \'PDF <span class="count">(%s)</span>\', \'PDFs <span class="count">(%s)</span>\' ) );
return $post_mime_types;
}
public function admin_scripts() {
wp_register_script( \'pdf-metabox-js\', plugins_url( \'/lib/js/pdf-metabox.js\', __FILE__ ) , array( \'jquery\' ), \'1.0.2\', true );
}
public function metabox_add() {
// Filterable metabox settings.
$post_types = array( \'post\');
$context = \'normal\';
$priority = \'low\';
// Loop through all post types
foreach( $post_types as $post_type ) {
// Add Metabox
add_meta_box( \'pdf_metabox\', __( \'PDF\', \'pdf-metabox\' ), array( $this, \'pdf_metabox\' ), $post_type, $context, $priority );
// Add Necessary Scripts and Styles
wp_enqueue_media();
wp_enqueue_script( \'pdf-metabox-js\' );
}
}
public function pdf_metabox( $post ) {
$original_post = $post;
echo $this->pdf_metabox_html( $post->ID );
$post = $original_post;
}
public function pdf_item( $id ) {
if(!$id) return;
$pdf_url = esc_url_raw(wp_get_attachment_url($id));
$pdf = \'<object data="\'.$pdf_url.\'" type="application/pdf" height="580" width="100%">
<iframe src="//docs.google.com/viewer?url=\'.$pdf_url.\'&embedded=true" width="100%" height="580" frameborder="0"></iframe>
<p><a href="\'.$pdf_url.\'">\'.get_the_title($id).\'</a></p>
</object>\';
return $pdf;
}
public function pdf_metabox_html( $post_id ) {
$current_value = \'\';
$post_meta = get_post_custom($post_id);
if( isset($post_meta[\'pdf-id\'][0] ) ) $current_value = $post_meta[\'pdf-id\'][0];
$return = \'\';
//Nonce for verification
wp_nonce_field( plugin_basename( __FILE__ ), \'pdf_noncename\' );
$return .= \'<p>\';
$return .= \'<a title="\'.__( \'PDF\', \'pdf-metabox\' ).\'" class="button button-primary insert-pdf-button" id="insert-pdf-button" href="#" style="float:left">\'.__( \'Upload PDF\', \'pdf-metabox\' ).\'</a><span id="pdf-spinner" class="spinner" style="float:left"></span></p>\';
$return .= \'<div style="clear:both"></div>\';
$return .= \'<input type="hidden" name="pdf-id" id="pdf-id" value="\'.$current_value.\'">\';
$return .= \'<div style="clear:both"></div>\';
$return .= \'<div id="pdf-wrapper">\';
$pdf = $this->pdf_item( $current_value );
if( empty( $pdf ) ) {
$return .= \'<p>No pdf.</p>\';
} else {
$return .= $pdf;
}
$return .= \'</div>\';
return $return;
}
public function pdf_save_postdata($post_id){
// First we need to check if the current user is authorised to do this action.
//Currently capabilities of property post type is the same as normal post type
if ( isset($_POST[\'post_type\']) && \'post\' == $_POST[\'post_type\'] ) {
if ( !current_user_can( \'edit_post\', $post_id ) ) return;
}
// Secondly we need to check if the user intended to change this value.
if ( !isset( $_POST[\'pdf_noncename\'] ) || ! wp_verify_nonce( $_POST[\'pdf_noncename\'], plugin_basename( __FILE__ ) ) )
return;
// Thirdly we can save the value to the database
if(isset($_POST[\'pdf-id\']) ):
//Don\'t forget sanitize
update_post_meta($post_id, \'pdf-id\', sanitize_text_field( $_POST[\'pdf-id\'] ) );
else:
if (isset($post_id)) {
delete_post_meta($post_id, \'pdf-id\');
}
endif;
}
public function refresh_pdf() {
if(isset($_POST[\'id\'])){
$item = $_POST[\'id\'];
if($item != \'\' && $item !=0){
$pdf = $this->pdf_item( $item );
$ret = array();
if( !empty( $pdf ) ) {
$ret[\'success\'] = true;
$ret[\'pdf\'] = $pdf;
} else {
$ret[\'success\'] = false;
}
} else {
//Is success but the $_POST[\'ids\'] is empty, maybe deleting deattiching files so:
$ret[\'success\'] = true;
$ret[\'pdf\'] = \'\';
}
} else {
$ret[\'success\'] = false;
}
echo json_encode( $ret );
die();
}
}
// Instantiate our class
$PDF_Metabox = new PDF_Metabox();
?>
javascript：
// **************************************************************
// Refresh pdf function - fired when a new pdf is selectd
// **************************************************************
function Refresh_PDF(the_ids){
jQuery(\'#pdf-spinner\').css(\'display\',\'inline\');
var data = {
action: \'refresh_pdf\',
id: the_ids
};
jQuery.post(ajaxurl, data, function(response) {
var obj;
try {
obj = jQuery.parseJSON(response);
}
catch(e) { // bad JSON catch
// add some error messaging ?
}
if(obj.success === true) { // it worked. AS IT SHOULD.
if( obj.pdf != \'\' ) {
jQuery(\'div#pdf-wrapper\').html(obj.pdf);
} else {
jQuery(\'div#pdf-wrapper\').html(\'\');
}
jQuery(\'#pdf-spinner\').css(\'display\',\'none\');
// add some success messaging ?
}
else { // something else went wrong
// add some error messaging ?
}
});
}
// **************************************************************
// now start the engine
// **************************************************************
jQuery(document).ready( function($) {
jQuery(\'#insert-pdf-button\').click(function(e) {
e.preventDefault();
var frame = wp.media({
title : \'Pick the PDF to attach to this entry\',
frame: \'select\',
multiple : false,
library : {
type : \'application/pdf\'
},
button : { text : \'Insert\' }
});
frame.on(\'close\',function() {
// get selections and save to hidden input plus other AJAX stuff etc.
var selection = frame.state().get(\'selection\');
var pdf_ids = new Array();
var my_index = 0;
selection.each(function(attachment) {
pdf_ids[my_index] = attachment[\'id\'];
my_index++;
});
var ids = pdf_ids.join(",");
jQuery(\'#pdf-id\').val(ids);
Refresh_PDF(ids);
});
frame.on(\'open\',function() {
var selection = frame.state().get(\'selection\');
ids = jQuery(\'#pdf-id\').val().split(\',\');
ids.forEach(function(id) {
attachment = wp.media.attachment(id);
attachment.fetch();
selection.add( attachment ? [ attachment ] : [] );
});
});
frame.on(\'toolbar:create:select\',function() {
frame.state().set(\'filterable\', \'uploaded\');
});
frame.open();
})
});
插件将附加PDF文件的ID存储在元字段“PDF ID”中。要在前端获得它，您可以使用不同的方法。例如
if you are inside the loop 您可以使用：
<?php
$post_meta = get_post_custom(get_the_ID());
$pdf_id = $post_meta[\'pdf-id\'][0];
$pdf_url = wp_get_attachment_url($pdf_id);
echo $pdf_url;
?>
