Uploading With WordPress

ajax-action.php

add_action( 'wp_ajax_nopriv_submit_content', 'my_submission_processor' );
add_action( 'wp_ajax_submit_content', 'my_submission_processor' );

function my_submission_processor() {
	// Handle the form in here
}

content-submit-page.php

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
	<?php
		// Post thumbnail.
		twentyfifteen_post_thumbnail();
	?>

	<header class="entry-header">
		<?php the_title( '<h1 class="entry-title">', '</h1>' ); ?>
	</header><!-- .entry-header -->

	<div class="entry-content">
		<?php the_content(); ?>
		<?php
			wp_link_pages( array(
				'before'      => '<div class="page-links"><span class="page-links-title">' . __( 'Pages:', 'twentyfifteen' ) . '</span>',
				'after'       => '</div>',
				'link_before' => '<span>',
				'link_after'  => '</span>',
				'pagelink'    => '<span class="screen-reader-text">' . __( 'Page', 'twentyfifteen' ) . ' </span>%',
				'separator'   => '<span class="screen-reader-text">, </span>',
			) );
		?>
		
		<!-- Form Goes Here -->

	</div><!-- .entry-content -->


	<?php edit_post_link( __( 'Edit', 'twentyfifteen' ), '<footer class="entry-footer"><span class="edit-link">', '</span></footer><!-- .entry-footer -->' ); ?>

</article><!-- #post-## -->

form.php

<form action="<?php echo admin_url( 'admin-ajax.php' ) ?>" method="post" enctype="multipart/form-data">

	<?php wp_nonce_field( 'submit_content', 'my_nonce_field' ); ?>

	<p>
		<label><input type="text" name="post_title" placeholder="Enter a Title"></label>
	</p>
	<p>
		<label><textarea rows='5' name="post_content" placeholder="Enter a description"></textarea></label>
	</p>

	<p>
		<input type='file' name='image' accept='image/*'>
	</p>

	<p>
		<input type='hidden' name='action' value='submit_content'>
		<input type='submit' value='Submit Content'>
	</p>

</form>

functions.php

<?php

add_action( 'wp_enqueue_scripts', 'enqueue_parent_styles' );

function enqueue_parent_styles() {
	wp_enqueue_style( 'parent-style', get_template_directory_uri().'/style.css' );
}

my_submission_processor_short.php

function my_submission_processor() {
	$post_data = array(
		'post_title' => $_POST['post_title'],
		'post_content' => $_POST['post_content'],
		'post_status' => 'draft'
	);
	
	$post_id = wp_insert_post( $post_data );
	my_upload_function( $_FILE['image'], $post_id, true );
	
	wp_redirect( site_url() . '/thank-you/' );
	die();
}

my_upload_function.php

function my_upload_function( $file, $post_id = 0 , $set_as_featured == false ) {
    $upload = wp_upload_bits( $file['name'], null, file_get_contents( $file['tmp_name'] ) );

    $wp_filetype = wp_check_filetype( basename( $upload['file'] ), null );

    $wp_upload_dir = wp_upload_dir();

    $attachment = array(
        'guid' => $wp_upload_dir['baseurl'] . _wp_relative_upload_path( $upload['file'] ),
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => preg_replace('/\.[^.]+$/', '', basename( $upload['file'] )),
        'post_content' => '',
        'post_status' => 'inherit'
    );
    
    $attach_id = wp_insert_attachment( $attachment, $upload['file'], $post_id );

    require_once(ABSPATH . 'wp-admin/includes/image.php');

    $attach_data = wp_generate_attachment_metadata( $attach_id, $upload['file'] );
    wp_update_attachment_metadata( $attach_id, $attach_data );

    if( $set_as_featured == true ) {
        update_post_meta( $post_id, '_thumbnail_id', $attach_id );
    }

}

style.css

/*
Theme Name: Twenty Fifteen Upload Test
Theme URI: http://danielpataki.com
Description: A test for upload functions
Author: Daniel Pataki
Author URI: http://danielpataki.com
Template: twentyfifteen
Version: 1.0.0
*/

submission-simple.php

function my_submission_processor() {
	$post_data = array(
		'post_title' => $_POST['post_title'],
		'post_content' => $_POST['post_content'],
		'post_status' => 'draft'
	);

	$post_id = wp_insert_post( $post_data );

	wp_redirect( site_url() . '/thank-you/' );

	die();
}

template-basic.php

/**
 * Template Name: Submission Page
 */

template.php

<?php 
/**
 * Template Name: Submission Page
 */


 get_header(); ?>

	<div id="primary" class="content-area">
		<main id="main" class="site-main" role="main">

		<?php
		// Start the loop.
		while ( have_posts() ) : the_post();

			// Include the page content template.
			get_template_part( 'content', 'submit-page' );

		// End the loop.
		endwhile;
		?>

		<!-- Our Form Will Go Here -->

		</main><!-- .site-main -->
	</div><!-- .content-area -->

<?php get_footer(); ?>

upload.php

function my_submission_processor() {
	$post_data = array(
		'post_title' => $_POST['post_title'],
		'post_content' => $_POST['post_content'],
		'post_status' => 'draft'
	);

	$post_id = wp_insert_post( $post_data );

    $upload = wp_upload_bits( $_FILES['image']['name'], null, file_get_contents( $_FILES['image']['tmp_name'] ) );

    $wp_filetype = wp_check_filetype( basename( $upload['file'] ), null );

    $wp_upload_dir = wp_upload_dir();

    $attachment = array(
        'guid' => $wp_upload_dir['baseurl'] . _wp_relative_upload_path( $upload['file'] ),
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => preg_replace('/\.[^.]+$/', '', basename( $upload['file'] )),
        'post_content' => '',
        'post_status' => 'inherit'
    );
    
    $attach_id = wp_insert_attachment( $attachment, $upload['file'], $post_id );

    require_once(ABSPATH . 'wp-admin/includes/image.php');

    $attach_data = wp_generate_attachment_metadata( $attach_id, $upload['file'] );
    wp_update_attachment_metadata( $attach_id, $attach_data );

    update_post_meta( $post_id, '_thumbnail_id', $attach_id );

	wp_redirect( site_url() . '/thank-you/' );

	die();
}