WordPress/wp-admin/export.php

<?php
/**
 * WordPress Export Administration Panel
 *
 * @package WordPress
 * @subpackage Administration
 */

/** Load WordPress Bootstrap */
require_once ('admin.php');

if ( !current_user_can('edit_files') )
	wp_die(__('You do not have sufficient permissions to export the content of this site.'));

/** Load WordPress export API */
require_once('./includes/export.php');
$title = __('Export');

if ( isset( $_GET['download'] ) ) {
		$author = isset($_GET['author']) ? $_GET['author'] : 'all';
		$taxonomy = array();
		foreach ( get_taxonomies( array( 'show_ui' => true ) ) as $tax )
			$taxonomy[ $tax ] = ! empty( $_GET['taxonomy'][ $tax ] ) ? $_GET['taxonomy'][ $tax ] : 'all';
		$post_type = isset($_GET['post_type']) ? stripslashes_deep($_GET['post_type']) : 'all';
		$status = isset($_GET['status']) ? stripslashes_deep($_GET['status']) : 'all';
		$mm_start = isset($_GET['mm_start']) ? $_GET['mm_start'] : 'all';
		$mm_end = isset($_GET['mm_end']) ? $_GET['mm_end'] : 'all';
		if( $mm_start != 'all' ) {
			$start_date = sprintf( "%04d-%02d-%02d", substr( $mm_start, 0, 4 ), substr( $mm_start, 5, 2 ), 1 );
		} else {
			$start_date = 'all';
		}
		if( $mm_end != 'all' ) {
			$end_date = sprintf( "%04d-%02d-%02d", substr( $mm_end, 0, 4 ), substr( $mm_end, 5, 2 ), 1 );
		} else {
			$end_date = 'all';
		}

	export_wp( array( 'author' => $author, 'taxonomy' => $taxonomy, 'post_type' => $post_type, 'post_status' => $status, 'start_date' => $start_date, 'end_date' => $end_date ) );
	die();
}

require_once ('admin-header.php');

$dateoptions = $edateoptions = '';
$types = "'" . implode("', '", get_post_types( array( 'public' => true, 'can_export' => true ), 'names' )) . "'";
$stati = "'" . implode("', '", get_post_stati( array( 'internal' => false ), 'names' )) . "'";
if ( $monthyears = $wpdb->get_results("SELECT DISTINCT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, YEAR(DATE_ADD(post_date, INTERVAL 1 MONTH)) AS `eyear`, MONTH(DATE_ADD(post_date, INTERVAL 1 MONTH)) AS `emonth` FROM $wpdb->posts WHERE post_type IN ($types) AND post_status IN ($stati) ORDER BY post_date ASC ") ) {
	foreach ( $monthyears as $k => $monthyear )
		$monthyears[$k]->lmonth = $wp_locale->get_month( $monthyear->month, 2 );
	for( $s = 0, $e = count( $monthyears ) - 1; $e >= 0; $s++, $e-- ) { 
		$dateoptions .= "\t<option value=\"" . $monthyears[$s]->year . '-' . zeroise( $monthyears[$s]->month, 2 ) . '">' . $monthyears[$s]->lmonth . ' ' . $monthyears[$s]->year . "</option>\n";
		$edateoptions .= "\t<option value=\"" . $monthyears[$e]->eyear . '-' . zeroise( $monthyears[$e]->emonth, 2 ) . '">' . $monthyears[$e]->lmonth . ' ' . $monthyears[$e]->year . "</option>\n";
	}
}

?>

<div class="wrap">
<?php screen_icon(); ?>
<h2><?php echo esc_html( $title ); ?></h2>

<p><?php _e('When you click the button below WordPress will create an XML file for you to save to your computer.'); ?></p>
<p><?php _e('This format, which we call WordPress eXtended RSS or WXR, will contain your posts, pages, comments, custom fields, categories, and tags.'); ?></p>
<p><?php _e('Once you&#8217;ve saved the download file, you can use the Import function on another WordPress site to import this site.'); ?></p>
<form action="" method="get">
<h3><?php _e('Filters'); ?></h3>

<table class="form-table">
<tr>
<th><label for="mm_start"><?php _e('Start Date'); ?></label></th>
<td>
<select name="mm_start" id="mm_start">
	<option value="all" selected="selected"><?php _e('All Dates'); ?></option>
<?php echo $dateoptions; ?>
</select>
</td>
</tr>
<tr>
<th><label for="mm_end" id="mm_end"><?php _e('End Date'); ?></label></th>
<td>
<select name="mm_end" id="mm_end">
	<option value="all" selected="selected"><?php _e('All Dates'); ?></option>
<?php echo $edateoptions; ?>
</select>
</td>
</tr>
<tr>
<th><label for="author"><?php _e('Authors'); ?></label></th>
<td>
<select name="author" id="author">
<option value="all" selected="selected"><?php _e('All Authors'); ?></option>
<?php
$authors = $wpdb->get_results( "SELECT DISTINCT u.id, u.display_name FROM $wpdb->users u INNER JOIN $wpdb->posts p WHERE u.id = p.post_author ORDER BY u.display_name" );
foreach ( (array) $authors as $author ) {
	echo "<option value='{$author->id}'>{$author->display_name}</option>\n";
}
?>
</select>
</td>
</tr>
<?php foreach ( get_taxonomies( array( 'show_ui' => true ), 'objects' ) as $tax_obj ) {
	$term_dropdown = wp_dropdown_categories( array( 'taxonomy' => $tax_obj->name, 'hide_if_empty' => true, 'show_option_all' => __( 'All Terms' ), 'name' => 'taxonomy[' . $tax_obj->name . ']', 'id' => 'taxonomy-' . $tax_obj->name, 'class' => '', 'echo' => false ) );
	if ( $term_dropdown )
		echo '<tr><th><label for="taxonomy-' . $tax_obj->name . '">' . $tax_obj->labels->name . '</label></th><td>' . $term_dropdown . '</td></tr>';
}
?>
<tr>
<th><label for="post_type"><?php _e('Content Types'); ?></label></th>
<td>
<select name="post_type" id="post_type">
	<option value="all" selected="selected"><?php _e('All Content'); ?></option>
	<?php foreach ( get_post_types( array( 'public' => true, 'can_export' => true ), 'objects' ) as $post_type_obj ) { ?>
		<option value="<?php echo $post_type_obj->name; ?>"><?php echo $post_type_obj->labels->name; ?></option>
	<?php } ?>
</select>
</td>
</tr>
<tr>
<th><label for="status"><?php _e('Statuses'); ?></label></th>
<td>
<select name="status" id="status">
	<option value="all" selected="selected"><?php _e('All Statuses'); ?></option>
<?php foreach ( get_post_stati( array( 'internal' => false ), 'objects' ) as $post_status_obj ) { ?>
	<option value="<?php echo $post_status_obj->name; ?>"><?php echo $post_status_obj->label; ?></option>
<?php } ?>
</select>
</td>
</tr>
</table>
<p class="submit"><input type="submit" name="submit" class="button" value="<?php esc_attr_e('Download Export File'); ?>" />
<input type="hidden" name="download" value="true" />
</p>
</form>
</div>

<?php


include ('admin-footer.php');
?>