Cricao de Sites - 650 Layouts Prontos/WebMasters.iso/Blogs/wordpress2.6.exe/wordpress2.6/wp-admin/includes/post.php

PHP Script | 2008-07-22 | 21.9 KB | 686 lines

<?php

/**
 * _wp_translate_postdata() - Rename $_POST data from form names to DB post columns.
 *
 * Manipulates $_POST directly.
 *
 * @package WordPress
 * @since 2.6
 *
 * @param bool $update Are we updating a pre-existing post?
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_translate_postdata( $update = false ) {
    if ( $update )
        $_POST['ID'] = (int) $_POST['post_ID'];
    $_POST['post_content'] = $_POST['content'];
    $_POST['post_excerpt'] = $_POST['excerpt'];
    $_POST['post_parent'] = isset($_POST['parent_id'])? $_POST['parent_id'] : '';
    $_POST['to_ping'] = $_POST['trackback_url'];

    if (!empty ( $_POST['post_author_override'] ) ) {
        $_POST['post_author'] = (int) $_POST['post_author_override'];
    } else {
        if (!empty ( $_POST['post_author'] ) ) {
            $_POST['post_author'] = (int) $_POST['post_author'];
        } else {
            $_POST['post_author'] = (int) $_POST['user_ID'];
        }
    }

    if ( $_POST['post_author'] != $_POST['user_ID'] ) {
        if ( 'page' == $_POST['post_type'] ) {
            if ( !current_user_can( 'edit_others_pages' ) ) {
                return new WP_Error( 'edit_others_pages', $update ?
                    __( 'You are not allowed to edit pages as this user.' ) :
                    __( 'You are not allowed to create pages as this user.' )
                );
            }
        } else {
            if ( !current_user_can( 'edit_others_posts' ) ) {
                return new WP_Error( 'edit_others_posts', $update ?
                    __( 'You are not allowed to edit posts as this user.' ) :
                    __( 'You are not allowed to post as this user.' )
                );
            }
        }
    }

    // What to do based on which button they pressed
    if ( isset($_POST['saveasdraft']) && '' != $_POST['saveasdraft'] )
        $_POST['post_status'] = 'draft';
    if ( isset($_POST['saveasprivate']) && '' != $_POST['saveasprivate'] )
        $_POST['post_status'] = 'private';
    if ( isset($_POST['publish']) && ( '' != $_POST['publish'] ) && ( $_POST['post_status'] != 'private' ) )
        $_POST['post_status'] = 'publish';
    if ( isset($_POST['advanced']) && '' != $_POST['advanced'] )
        $_POST['post_status'] = 'draft';

    $previous_status = get_post_field('post_status',  $_POST['ID']);

    // Posts 'submitted for approval' present are submitted to $_POST the same as if they were being published.
    // Change status from 'publish' to 'pending' if user lacks permissions to publish or to resave published posts.
    if ( 'page' == $_POST['post_type'] ) {
        if ( 'publish' == $_POST['post_status'] && !current_user_can( 'publish_pages' ) )
            if ( $previous_status != 'publish' OR !current_user_can( 'edit_published_pages') )
                $_POST['post_status'] = 'pending';
    } else {
        if ( 'publish' == $_POST['post_status'] && !current_user_can( 'publish_posts' ) ) :
            // Stop attempts to publish new posts, but allow already published posts to be saved if appropriate.
            if ( $previous_status != 'publish' OR !current_user_can( 'edit_published_posts') )
                $_POST['post_status'] = 'pending';
        endif;
    }

    if (!isset( $_POST['comment_status'] ))
        $_POST['comment_status'] = 'closed';

    if (!isset( $_POST['ping_status'] ))
        $_POST['ping_status'] = 'closed';

    foreach ( array('aa', 'mm', 'jj', 'hh', 'mn') as $timeunit ) {
        if ( !empty( $_POST['hidden_' . $timeunit] ) && $_POST['hidden_' . $timeunit] != $_POST[$timeunit] ) {
            $_POST['edit_date'] = '1';
            break;
        }
    }

    if ( !empty( $_POST['edit_date'] ) ) {
        $aa = $_POST['aa'];
        $mm = $_POST['mm'];
        $jj = $_POST['jj'];
        $hh = $_POST['hh'];
        $mn = $_POST['mn'];
        $ss = $_POST['ss'];
        $aa = ($aa <= 0 ) ? date('Y') : $aa;
        $mm = ($mm <= 0 ) ? date('n') : $mm;
        $jj = ($jj > 31 ) ? 31 : $jj;
        $jj = ($jj <= 0 ) ? date('j') : $jj;
        $hh = ($hh > 23 ) ? $hh -24 : $hh;
        $mn = ($mn > 59 ) ? $mn -60 : $mn;
        $ss = ($ss > 59 ) ? $ss -60 : $ss;
        $_POST['post_date'] = sprintf( "%04d-%02d-%02d %02d:%02d:%02d", $aa, $mm, $jj, $hh, $mn, $ss );
        $_POST['post_date_gmt'] = get_gmt_from_date( $_POST['post_date'] );
    }

    return true;
}


// Update an existing post with values provided in $_POST.
function edit_post() {

    $post_ID = (int) $_POST['post_ID'];

    if ( 'page' == $_POST['post_type'] ) {
        if ( !current_user_can( 'edit_page', $post_ID ) )
            wp_die( __('You are not allowed to edit this page.' ));
    } else {
        if ( !current_user_can( 'edit_post', $post_ID ) )
            wp_die( __('You are not allowed to edit this post.' ));
    }

    // Autosave shouldn't save too soon after a real save
    if ( 'autosave' == $_POST['action'] ) {
        $post =& get_post( $post_ID );
        $now = time();
        $then = strtotime($post->post_date_gmt . ' +0000');
        $delta = AUTOSAVE_INTERVAL / 2;
        if ( ($now - $then) < $delta )
            return $post_ID;
    }

    $translated = _wp_translate_postdata( true );
    if ( is_wp_error($translated) )
        wp_die( $translated->get_error_message() );

    // Meta Stuff
    if ( isset($_POST['meta']) && $_POST['meta'] ) {
        foreach ( $_POST['meta'] as $key => $value )
            update_meta( $key, $value['key'], $value['value'] );
    }

    if ( isset($_POST['deletemeta']) && $_POST['deletemeta'] ) {
        foreach ( $_POST['deletemeta'] as $key => $value )
            delete_meta( $key );
    }

    add_meta( $post_ID );

    wp_update_post( $_POST );

    // Reunite any orphaned attachments with their parent
    if ( !$draft_ids = get_user_option( 'autosave_draft_ids' ) )
        $draft_ids = array();
    if ( $draft_temp_id = (int) array_search( $post_ID, $draft_ids ) )
        _relocate_children( $draft_temp_id, $post_ID );

    // Now that we have an ID we can fix any attachment anchor hrefs
    _fix_attachment_links( $post_ID );

    wp_set_post_lock( $post_ID, $GLOBALS['current_user']->ID );

    return $post_ID;
}

// Default post information to use when populating the "Write Post" form.
function get_default_post_to_edit() {
    if ( !empty( $_REQUEST['post_title'] ) )
        $post_title = wp_specialchars( stripslashes( $_REQUEST['post_title'] ));
    else if ( !empty( $_REQUEST['popuptitle'] ) ) {
        $post_title = wp_specialchars( stripslashes( $_REQUEST['popuptitle'] ));
        $post_title = funky_javascript_fix( $post_title );
    } else {
        $post_title = '';
    }

    $post_content = '';
    if ( !empty( $_REQUEST['content'] ) )
        $post_content = wp_specialchars( stripslashes( $_REQUEST['content'] ));
    else if ( !empty( $post_title ) ) {
        $text       = wp_specialchars( stripslashes( urldecode( $_REQUEST['text'] ) ) );
        $text       = funky_javascript_fix( $text);
        $popupurl   = clean_url($_REQUEST['popupurl']);
        $post_content = '<a href="'.$popupurl.'">'.$post_title.'</a>'."\n$text";
    }

    if ( !empty( $_REQUEST['excerpt'] ) )
        $post_excerpt = wp_specialchars( stripslashes( $_REQUEST['excerpt'] ));
    else
        $post_excerpt = '';

    $post->ID = 0;
    $post->post_name = '';
    $post->post_author = '';
    $post->post_date = '';
    $post->post_status = 'draft';
    $post->post_type = 'post';
    $post->to_ping = '';
    $post->pinged = '';
    $post->comment_status = get_option( 'default_comment_status' );
    $post->ping_status = get_option( 'default_ping_status' );
    $post->post_pingback = get_option( 'default_pingback_flag' );
    $post->post_category = get_option( 'default_category' );
    $post->post_content = apply_filters( 'default_content', $post_content);
    $post->post_title = apply_filters( 'default_title', $post_title );
    $post->post_excerpt = apply_filters( 'default_excerpt', $post_excerpt);
    $post->page_template = 'default';
    $post->post_parent = 0;
    $post->menu_order = 0;

    return $post;
}

function get_default_page_to_edit() {
     $page = get_default_post_to_edit();
     $page->post_type = 'page';
     return $page;
}

// Get an existing post and format it for editing.
function get_post_to_edit( $id ) {

    $post = get_post( $id, OBJECT, 'edit' );

    if ( $post->post_type == 'page' )
        $post->page_template = get_post_meta( $id, '_wp_page_template', true );

    return $post;
}

function post_exists($title, $content = '', $post_date = '') {
    global $wpdb;

    if (!empty ($post_date))
        $post_date = $wpdb->prepare("AND post_date = %s", $post_date);

    if (!empty ($title))
        return $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_title = %s $post_date", $title) );
    else
        if (!empty ($content))
            return $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_content = %s $post_date", $content) );

    return 0;
}

// Creates a new post from the "Write Post" form using $_POST information.
function wp_write_post() {
    global $user_ID;

    if ( 'page' == $_POST['post_type'] ) {
        if ( !current_user_can( 'edit_pages' ) )
            return new WP_Error( 'edit_pages', __( 'You are not allowed to create pages on this blog.' ) );
    } else {
        if ( !current_user_can( 'edit_posts' ) )
            return new WP_Error( 'edit_posts', __( 'You are not allowed to create posts or drafts on this blog.' ) );
    }


    // Check for autosave collisions
    $temp_id = false;
    if ( isset($_POST['temp_ID']) ) {
        $temp_id = (int) $_POST['temp_ID'];
        if ( !$draft_ids = get_user_option( 'autosave_draft_ids' ) )
            $draft_ids = array();
        foreach ( $draft_ids as $temp => $real )
            if ( time() + $temp > 86400 ) // 1 day: $temp is equal to -1 * time( then )
                unset($draft_ids[$temp]);

        if ( isset($draft_ids[$temp_id]) ) { // Edit, don't write
            $_POST['post_ID'] = $draft_ids[$temp_id];
            unset($_POST['temp_ID']);
            update_user_option( $user_ID, 'autosave_draft_ids', $draft_ids );
            return edit_post();
        }
    }

    $translated = _wp_translate_postdata( false );
    if ( is_wp_error($translated) )
        return $translated;

    // Create the post.
    $post_ID = wp_insert_post( $_POST );
    if ( is_wp_error( $post_ID ) )
        return $post_ID;

    if ( empty($post_ID) )
        return 0;

    add_meta( $post_ID );

    // Reunite any orphaned attachments with their parent
    if ( !$draft_ids = get_user_option( 'autosave_draft_ids' ) )
        $draft_ids = array();
    if ( $draft_temp_id = (int) array_search( $post_ID, $draft_ids ) )
        _relocate_children( $draft_temp_id, $post_ID );
    if ( $temp_id && $temp_id != $draft_temp_id )
        _relocate_children( $temp_id, $post_ID );

    // Update autosave collision detection
    if ( $temp_id ) {
        $draft_ids[$temp_id] = $post_ID;
        update_user_option( $user_ID, 'autosave_draft_ids', $draft_ids );
    }

    // Now that we have an ID we can fix any attachment anchor hrefs
    _fix_attachment_links( $post_ID );

    wp_set_post_lock( $post_ID, $GLOBALS['current_user']->ID );

    return $post_ID;
}

function write_post() {
    $result = wp_write_post();
    if( is_wp_error( $result ) )
        wp_die( $result->get_error_message() );
    else
        return $result;
}

//
// Post Meta
//

function add_meta( $post_ID ) {
    global $wpdb;
    $post_ID = (int) $post_ID;

    $protected = array( '_wp_attached_file', '_wp_attachment_metadata', '_wp_old_slug', '_wp_page_template' );

    $metakeyselect = $wpdb->escape( stripslashes( trim( $_POST['metakeyselect'] ) ) );
    $metakeyinput = $wpdb->escape( stripslashes( trim( $_POST['metakeyinput'] ) ) );
    $metavalue = maybe_serialize( stripslashes( (trim( $_POST['metavalue'] ) ) ));
    $metavalue = $wpdb->escape( $metavalue );

    if ( ('0' === $metavalue || !empty ( $metavalue ) ) && ((('#NONE#' != $metakeyselect) && !empty ( $metakeyselect) ) || !empty ( $metakeyinput) ) ) {
        // We have a key/value pair. If both the select and the
        // input for the key have data, the input takes precedence:

         if ('#NONE#' != $metakeyselect)
            $metakey = $metakeyselect;

        if ( $metakeyinput)
            $metakey = $metakeyinput; // default

        if ( in_array($metakey, $protected) )
            return false;

        wp_cache_delete($post_ID, 'post_meta');

        $wpdb->query( $wpdb->prepare("INSERT INTO $wpdb->postmeta
            (post_id,meta_key,meta_value ) VALUES (%s, %s, %s)",
            $post_ID, $metakey, $metavalue) );
        return $wpdb->insert_id;
    }
    return false;
} // add_meta

function delete_meta( $mid ) {
    global $wpdb;
    $mid = (int) $mid;

    $post_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_id = %d", $mid) );
    wp_cache_delete($post_id, 'post_meta');

    return $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_id = %d", $mid) );
}

// Get a list of previously defined keys
function get_meta_keys() {
    global $wpdb;

    $keys = $wpdb->get_col( "
            SELECT meta_key
            FROM $wpdb->postmeta
            GROUP BY meta_key
            ORDER BY meta_key" );

    return $keys;
}

function get_post_meta_by_id( $mid ) {
    global $wpdb;
    $mid = (int) $mid;

    $meta = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->postmeta WHERE meta_id = %d", $mid) );
    if ( is_serialized_string( $meta->meta_value ) )
        $meta->meta_value = maybe_unserialize( $meta->meta_value );
    return $meta;
}

// Some postmeta stuff
function has_meta( $postid ) {
    global $wpdb;

    return $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value, meta_id, post_id
            FROM $wpdb->postmeta WHERE post_id = %d
            ORDER BY meta_key,meta_id", $postid), ARRAY_A );

}

function update_meta( $meta_id, $meta_key, $meta_value ) {
    global $wpdb;

    $protected = array( '_wp_attached_file', '_wp_attachment_metadata', '_wp_old_slug', '_wp_page_template' );

    if ( in_array($meta_key, $protected) )
        return false;

    $post_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_id = %d", $meta_id) );
    wp_cache_delete($post_id, 'post_meta');

    $meta_value = maybe_serialize( stripslashes( $meta_value ));
    $meta_id = (int) $meta_id;

    $data  = compact( 'meta_key', 'meta_value' );
    $where = compact( 'meta_id' );

    return $wpdb->update( $wpdb->postmeta, $data, $where );
}

//
// Private
//

// Replace hrefs of attachment anchors with up-to-date permalinks.
function _fix_attachment_links( $post_ID ) {

    $post = & get_post( $post_ID, ARRAY_A );

    $search = "#<a[^>]+rel=('|\")[^'\"]*attachment[^>]*>#ie";

    // See if we have any rel="attachment" links
    if ( 0 == preg_match_all( $search, $post['post_content'], $anchor_matches, PREG_PATTERN_ORDER ) )
        return;

    $i = 0;
    $search = "#[\s]+rel=(\"|')(.*?)wp-att-(\d+)\\1#i";
    foreach ( $anchor_matches[0] as $anchor ) {
        if ( 0 == preg_match( $search, $anchor, $id_matches ) )
            continue;

        $id = (int) $id_matches[3];

        // While we have the attachment ID, let's adopt any orphans.
        $attachment = & get_post( $id, ARRAY_A );
        if ( ! empty( $attachment) && ! is_object( get_post( $attachment['post_parent'] ) ) ) {
            $attachment['post_parent'] = $post_ID;
            // Escape data pulled from DB.
            $attachment = add_magic_quotes( $attachment);
            wp_update_post( $attachment);
        }

        $post_search[$i] = $anchor;
        $post_replace[$i] = preg_replace( "#href=(\"|')[^'\"]*\\1#e", "stripslashes( 'href=\\1' ).get_attachment_link( $id ).stripslashes( '\\1' )", $anchor );
        ++$i;
    }

    $post['post_content'] = str_replace( $post_search, $post_replace, $post['post_content'] );

    // Escape data pulled from DB.
    $post = add_magic_quotes( $post);

    return wp_update_post( $post);
}

// Move child posts to a new parent
function _relocate_children( $old_ID, $new_ID ) {
    global $wpdb;
    $old_ID = (int) $old_ID;
    $new_ID = (int) $new_ID;
    return $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET post_parent = %d WHERE post_parent = %d", $new_ID, $old_ID) );
}

function get_available_post_statuses($type = 'post') {
    $stati = wp_count_posts($type);

    return array_keys(get_object_vars($stati));
}

function wp_edit_posts_query( $q = false ) {
    global $wpdb;
    if ( false === $q )
        $q = $_GET;
    $q['m']   = (int) $q['m'];
    $q['cat'] = (int) $q['cat'];
    $post_stati  = array(    //    array( adj, noun )
                'publish' => array(__('Published'), __('Published posts'), __ngettext_noop('Published (%s)', 'Published (%s)')),
                'future' => array(__('Scheduled'), __('Scheduled posts'), __ngettext_noop('Scheduled (%s)', 'Scheduled (%s)')),
                'pending' => array(__('Pending Review'), __('Pending posts'), __ngettext_noop('Pending Review (%s)', 'Pending Review (%s)')),
                'draft' => array(__('Draft'), _c('Drafts|manage posts header'), __ngettext_noop('Draft (%s)', 'Drafts (%s)')),
                'private' => array(__('Private'), __('Private posts'), __ngettext_noop('Private (%s)', 'Private (%s)')),
            );

    $post_stati = apply_filters('post_stati', $post_stati);

    $avail_post_stati = get_available_post_statuses('post');

    $post_status_q = '';
    if ( isset($q['post_status']) && in_array( $q['post_status'], array_keys($post_stati) ) ) {
        $post_status_q = '&post_status=' . $q['post_status'];
        $post_status_q .= '&perm=readable';
    }

    if ( 'pending' === $q['post_status'] ) {
        $order = 'ASC';
        $orderby = 'modified';
    } elseif ( 'draft' === $q['post_status'] ) {
        $order = 'DESC';
        $orderby = 'modified';
    } else {
        $order = 'DESC';
        $orderby = 'date';
    }

    wp("post_type=post&what_to_show=posts$post_status_q&posts_per_page=15&order=$order&orderby=$orderby");

    return array($post_stati, $avail_post_stati);
}

function get_available_post_mime_types($type = 'attachment') {
    global $wpdb;

    $types = $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type));
    return $types;
}

function wp_edit_attachments_query( $q = false ) {
    global $wpdb;
    if ( false === $q )
        $q = $_GET;
    $q['m']   = (int) $q['m'];
    $q['cat'] = (int) $q['cat'];
    $q['post_type'] = 'attachment';
    $q['post_status'] = 'any';
    $q['posts_per_page'] = 15;
    $post_mime_types = array(    //    array( adj, noun )
                'image' => array(__('Images'), __('Manage Images'), __ngettext_noop('Image (%s)', 'Images (%s)')),
                'audio' => array(__('Audio'), __('Manage Audio'), __ngettext_noop('Audio (%s)', 'Audio (%s)')),
                'video' => array(__('Video'), __('Manage Video'), __ngettext_noop('Video (%s)', 'Video (%s)')),
            );
    $post_mime_types = apply_filters('post_mime_types', $post_mime_types);

    $avail_post_mime_types = get_available_post_mime_types('attachment');

    if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) )
        unset($q['post_mime_type']);

    wp($q);

    return array($post_mime_types, $avail_post_mime_types);
}

function postbox_classes( $id, $page ) {
    $current_user = wp_get_current_user();
    if ( $closed = get_usermeta( $current_user->ID, 'closedpostboxes_'.$page ) ) {
        if ( !is_array( $closed ) ) return '';
        return in_array( $id, $closed )? 'if-js-closed' : '';
    } else {
        if ( 'tagsdiv' == $id || 'categorydiv' == $id ) return '';
        else return 'if-js-closed';
    }
}

function get_sample_permalink($id, $title=null, $name = null) {
    $post = &get_post($id);
    if (!$post->ID) {
        return array('', '');
    }
    $original_status = $post->post_status;
    $original_date = $post->post_date;
    $original_name = $post->post_name;

    // Hack: get_permalink would return ugly permalink for
    // drafts, so we will fake, that our post is published
    if (in_array($post->post_status, array('draft', 'pending'))) {
        $post->post_status = 'publish';
        $post->post_date = date('Y-m-d H:i:s');
        $post->post_name = sanitize_title($post->post_name? $post->post_name : $post->post_title, $post->ID);
    }

    // If the user wants to set a new name -- override the current one
    // Note: if empty name is supplied -- use the title instead, see #6072
    if (!is_null($name)) {
        $post->post_name = sanitize_title($name? $name : $title, $post->ID);
    }

    $permalink = get_permalink($post, true);

    // Handle page hierarchy
    if ( 'page' == $post->post_type ) {
        $uri = get_page_uri($post->ID);
        $uri = untrailingslashit($uri);
        $uri = strrev( stristr( strrev( $uri ), '/' ) );
        $uri = untrailingslashit($uri);
        if ( !empty($uri) )
            $uri .='/';
        $permalink = str_replace('%pagename%', "${uri}%pagename%", $permalink);
    }

    $permalink = array($permalink, apply_filters('editable_slug', $post->post_name));
    $post->post_status = $original_status;
    $post->post_date = $original_date;
    $post->post_name = $original_name;
    return $permalink;
}

function get_sample_permalink_html($id, $new_title=null, $new_slug=null) {
    $post = &get_post($id);
    list($permalink, $post_name) = get_sample_permalink($post->ID, $new_title, $new_slug);
    if (false === strpos($permalink, '%postname%') && false === strpos($permalink, '%pagename%')) {
        return '';
    }
    $title = __('Click to edit this part of the permalink');
    if (strlen($post_name) > 30) {
        $post_name_abridged = substr($post_name, 0, 14). '…' . substr($post_name, -14);
    } else {
        $post_name_abridged = $post_name;
    }
    $post_name_html = '<span id="editable-post-name" title="'.$title.'">'.$post_name_abridged.'</span><span id="editable-post-name-full">'.$post_name.'</span>';
    $display_link = str_replace(array('%pagename%','%postname%'), $post_name_html, $permalink);
    $return = '<strong>' . __('Permalink:') . "</strong>\n" . '<span id="sample-permalink">' . $display_link . "</span>\n";
    $return .= '<span id="edit-slug-buttons"><a href="#post_name" class="edit-slug" onclick="edit_permalink(' . $id . '); return false;">' . __('Edit') . "</a></span>\n";
    return $return;
}

// false: not locked or locked by current user
// int: user ID of user with lock
function wp_check_post_lock( $post_id ) {
    global $current_user;

    if ( !$post = get_post( $post_id ) )
        return false;

    $lock = get_post_meta( $post->ID, '_edit_lock', true );
    $last = get_post_meta( $post->ID, '_edit_last', true );

    $time_window = apply_filters( 'wp_check_post_lock_window', AUTOSAVE_INTERVAL * 2 );

    if ( $lock && $lock > time() - $time_window && $last != $current_user->ID )
        return $last;
    return false;
}

function wp_set_post_lock( $post_id ) {
    global $current_user;
    if ( !$post = get_post( $post_id ) )
        return false;
    if ( !$current_user || !$current_user->ID )
        return false;

    $now = time();

    if ( !add_post_meta( $post->ID, '_edit_lock', $now, true ) )
        update_post_meta( $post->ID, '_edit_lock', $now );
    if ( !add_post_meta( $post->ID, '_edit_last', $current_user->ID, true ) )
        update_post_meta( $post->ID, '_edit_last', $current_user->ID );
}

/**
 * wp_create_post_autosave() - creates autosave data for the specified post from $_POST data
 *
 * @package WordPress
 * @subpackage Post Revisions
 * @since 2.6
 *
 * @uses _wp_translate_postdata()
 * @uses _wp_post_revision_fields()
 */
function wp_create_post_autosave( $post_id ) {
    $translated = _wp_translate_postdata( true );
    if ( is_wp_error( $translated ) )
        return $translated;

    // Only store one autosave.  If there is already an autosave, overwrite it.
    if ( $old_autosave = wp_get_post_autosave( $post_id ) ) {
        $new_autosave = _wp_post_revision_fields( $_POST, true );
        $new_autosave['ID'] = $old_autosave->ID;
        return wp_update_post( $new_autosave );
    }

    // Otherwise create the new autosave as a special post revision
    return _wp_put_post_revision( $_POST, true );
}