Add files to library, pull in from outside

add-attachments-from-url.php

<?php

function iso_add_file( $post_id, $url ) {

	$temp_file = download_url( $url, 500 );
	if ( ! is_wp_error( $temp_file ) ) {

		$file_type = wp_check_filetype( $temp_file );


		// array based on $_FILE as seen in PHP file uploads
		$file = array(
			'name'     => basename( $url ), // ex: wp-header-logo.png
			'type'     => $file_type['type'],
			'tmp_name' => $temp_file,
			'error'    => 0,
			'size'     => filesize( $temp_file ),
		);

		$overrides = array(
			// tells WordPress to not look for the POST form
			// fields that would normally be present, default is true,
			// we downloaded the file from a remote server, so there
			// will be no form fields
			'test_form'   => false,
			// setting this to false lets WordPress allow empty files, not recommended
			'test_size'   => true,
			// A properly uploaded file will pass this test.
			// There should be no reason to override this one.
			'test_upload' => true,
		);

		// move the temporary file into the uploads directory
		$results = wp_handle_sideload( $file, $overrides );

		if ( ! empty( $results['error'] ) ) {
			// insert any error handling here

			return false;
		} else {

			$filename  = $results['file']; // full path to the file
			$local_url = $results['url']; // URL to the file in the uploads dir
			$type      = $results['type']; // MIME type of the file

			// perform any actions here based in the above results
			echo '
<pre>';
			echo '--------------------------------------------------------';
			var_dump( $results );
			echo '</pre>';


			// Prepare an array of post data for the attachment.
			$attachment = array(
				'guid'           => $results['file'],
				'post_mime_type' => $results['type'],
				'post_title'     => preg_replace( '/\.[^.]+$/', '', basename( $filename ) ),
				'post_content'   => '',
				'post_status'    => 'inherit'
			);

			// Insert the attachment.
			$attach_id = wp_insert_attachment( $attachment, $filename, $post_id );

			// Make sure that this file is included, as wp_generate_attachment_metadata() depends on it.
			//require_once( ABSPATH . 'wp-admin/includes/image.php' );

			// Generate the metadata for the attachment, and update the database record.
			$attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
			wp_update_attachment_metadata( $attach_id, $attach_data );

			echo 'Inserted as ' . $attach_id;
			echo '--------------------------------------------------------';

			return $attach_id;
		}
	} else {
		echo 'Something went wrong with ' . $url;

		return false;
	}
}