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atomlib.php	11.59 KB	-rwxrwxrwx
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blocks.php	25.26 KB	-rwxrwxrwx
bookmark-template.php	12.22 KB	-rwxrwxrwx
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cache-compat.php	1.02 KB	-rwxrwxrwx
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canonical.php	30.65 KB	-rwxrwxrwx
capabilities.php	33.98 KB	-rwxrwxrwx
category-template.php	53.63 KB	-rwxrwxrwx
category.php	12.41 KB	-rwxrwxrwx
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class-feed.php	529 B	-rwxrwxrwx
class-http.php	38.79 KB	-rwxrwxrwx
class-json.php	42.43 KB	-rwxrwxrwx
class-oembed.php	407 B	-rwxrwxrwx
class-phpass.php	7.15 KB	-rwxrwxrwx
class-phpmailer.php	664 B	-rwxrwxrwx
class-pop3.php	20.35 KB	-rwxrwxrwx
class-requests.php	29.14 KB	-rwxrwxrwx
class-simplepie.php	94.01 KB	-rwxrwxrwx
class-smtp.php	452 B	-rwxrwxrwx
class-snoopy.php	36.83 KB	-rwxrwxrwx
class-walker-category-dropdown...	2.08 KB	-rwxrwxrwx
class-walker-category.php	7.69 KB	-rwxrwxrwx
class-walker-comment.php	13.37 KB	-rwxrwxrwx
class-walker-nav-menu.php	8.45 KB	-rwxrwxrwx
class-walker-page-dropdown.php	2.25 KB	-rwxrwxrwx
class-walker-page.php	6.88 KB	-rwxrwxrwx
class-wp-admin-bar.php	16.46 KB	-rwxrwxrwx
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class-wp-block-type-registry.p...	4.69 KB	-rwxrwxrwx
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class-wp-block.php	5.97 KB	-rwxrwxrwx
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class-wp-comment.php	8.83 KB	-rwxrwxrwx
class-wp-customize-control.php	24.91 KB	-rwxrwxrwx
class-wp-customize-manager.php	196.37 KB	-rwxrwxrwx
class-wp-customize-nav-menus.p...	55.47 KB	-rwxrwxrwx
class-wp-customize-panel.php	10.16 KB	-rwxrwxrwx
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class-wp-customize-setting.php	29.03 KB	-rwxrwxrwx
class-wp-customize-widgets.php	65.46 KB	-rwxrwxrwx
class-wp-date-query.php	34.51 KB	-rwxrwxrwx
class-wp-dependency.php	2.45 KB	-rwxrwxrwx
class-wp-editor.php	68.93 KB	-rwxrwxrwx
class-wp-embed.php	15.42 KB	-rwxrwxrwx
class-wp-error.php	4.84 KB	-rwxrwxrwx
class-wp-fatal-error-handler.p...	7.37 KB	-rwxrwxrwx
class-wp-feed-cache-transient....	2.5 KB	-rwxrwxrwx
class-wp-feed-cache.php	749 B	-rwxrwxrwx
class-wp-hook.php	13.72 KB	-rwxrwxrwx
class-wp-http-cookie.php	7.02 KB	-rwxrwxrwx
class-wp-http-curl.php	12.06 KB	-rwxrwxrwx
class-wp-http-encoding.php	6.4 KB	-rwxrwxrwx
class-wp-http-ixr-client.php	3.39 KB	-rwxrwxrwx
class-wp-http-proxy.php	5.73 KB	-rwxrwxrwx
class-wp-http-requests-hooks.p...	1.92 KB	-rwxrwxrwx
class-wp-http-requests-respons...	4.24 KB	-rwxrwxrwx
class-wp-http-response.php	2.88 KB	-rwxrwxrwx
class-wp-http-streams.php	15.73 KB	-rwxrwxrwx
class-wp-image-editor-gd.php	13.81 KB	-rwxrwxrwx
class-wp-image-editor-imagick....	23.32 KB	-rwxrwxrwx
class-wp-image-editor.php	14.21 KB	-rwxrwxrwx
class-wp-list-util.php	6.46 KB	-rwxrwxrwx
class-wp-locale-switcher.php	4.9 KB	-rwxrwxrwx
class-wp-locale.php	13.59 KB	-rwxrwxrwx
class-wp-matchesmapregex.php	1.76 KB	-rwxrwxrwx
class-wp-meta-query.php	27.22 KB	-rwxrwxrwx
class-wp-metadata-lazyloader.p...	5.26 KB	-rwxrwxrwx
class-wp-network-query.php	17.94 KB	-rwxrwxrwx
class-wp-network.php	12.09 KB	-rwxrwxrwx
class-wp-object-cache.php	13.22 KB	-rwxrwxrwx
class-wp-oembed-controller.php	6.63 KB	-rwxrwxrwx
class-wp-oembed.php	28.31 KB	-rwxrwxrwx
class-wp-paused-extensions-sto...	4.81 KB	-rwxrwxrwx
class-wp-post-type.php	19.08 KB	-rwxrwxrwx
class-wp-post.php	6.29 KB	-rwxrwxrwx
class-wp-query.php	131.8 KB	-rwxrwxrwx
class-wp-recovery-mode-cookie-...	6.31 KB	-rwxrwxrwx
class-wp-recovery-mode-email-s...	9.89 KB	-rwxrwxrwx
class-wp-recovery-mode-key-ser...	4.17 KB	-rwxrwxrwx
class-wp-recovery-mode-link-se...	3.29 KB	-rwxrwxrwx
class-wp-recovery-mode.php	11.11 KB	-rwxrwxrwx
class-wp-rewrite.php	59.42 KB	-rwxrwxrwx
class-wp-role.php	2.44 KB	-rwxrwxrwx
class-wp-roles.php	8.23 KB	-rwxrwxrwx
class-wp-session-tokens.php	7.26 KB	-rwxrwxrwx
class-wp-simplepie-file.php	2.27 KB	-rwxrwxrwx
class-wp-simplepie-sanitize-ks...	1.73 KB	-rwxrwxrwx
class-wp-site-query.php	27.88 KB	-rwxrwxrwx
class-wp-site.php	7.19 KB	-rwxrwxrwx
class-wp-tax-query.php	18.98 KB	-rwxrwxrwx
class-wp-taxonomy.php	12.28 KB	-rwxrwxrwx
class-wp-term-query.php	35.32 KB	-rwxrwxrwx
class-wp-term.php	5.14 KB	-rwxrwxrwx
class-wp-text-diff-renderer-in...	716 B	-rwxrwxrwx
class-wp-text-diff-renderer-ta...	16.48 KB	-rwxrwxrwx
class-wp-theme.php	49.53 KB	-rwxrwxrwx
class-wp-user-meta-session-tok...	2.92 KB	-rwxrwxrwx
class-wp-user-query.php	30.62 KB	-rwxrwxrwx
class-wp-user-request.php	2.14 KB	-rwxrwxrwx
class-wp-user.php	21.63 KB	-rwxrwxrwx
class-wp-walker.php	12.42 KB	-rwxrwxrwx
class-wp-widget-factory.php	2.56 KB	-rwxrwxrwx
class-wp-widget.php	17.49 KB	-rwxrwxrwx
class-wp-xmlrpc-server.php	205.52 KB	-rwxrwxrwx
class-wp.php	24.45 KB	-rwxrwxrwx
class.wp-dependencies.php	12.57 KB	-rwxrwxrwx
class.wp-scripts.php	18.04 KB	-rwxrwxrwx
class.wp-styles.php	10.62 KB	-rwxrwxrwx
comment-template.php	91.85 KB	-rwxrwxrwx
comment.php	122.66 KB	-rwxrwxrwx
compat.php	11.46 KB	-rwxrwxrwx
cron.php	16.72 KB	-rwxrwxrwx
date.php	406 B	-rwxrwxrwx
default-constants.php	10.02 KB	-rwxrwxrwx
default-filters.php	26.14 KB	-rwxrwxrwx
default-widgets.php	2.07 KB	-rwxrwxrwx
deprecated.php	118.65 KB	-rwxrwxrwx
embed-template.php	341 B	-rwxrwxrwx
embed.php	46.43 KB	-rwxrwxrwx
error-protection.php	3.3 KB	-rwxrwxrwx
feed-atom-comments.php	5.32 KB	-rwxrwxrwx
feed-atom.php	3.03 KB	-rwxrwxrwx
feed-rdf.php	2.61 KB	-rwxrwxrwx
feed-rss.php	1.16 KB	-rwxrwxrwx
feed-rss2-comments.php	3.97 KB	-rwxrwxrwx
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feed.php	22.12 KB	-rwxrwxrwx
formatting.php	303.86 KB	-rwxrwxrwx
functions.php	255.24 KB	-rwxrwxrwx
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load.php	46.03 KB	-rwxrwxrwx
locale.php	162 B	-rwxrwxrwx
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ms-default-constants.php	4.6 KB	-rwxrwxrwx
ms-default-filters.php	6.34 KB	-rwxrwxrwx
ms-deprecated.php	20.63 KB	-rwxrwxrwx
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ms-functions.php	88.26 KB	-rwxrwxrwx
ms-load.php	19.36 KB	-rwxrwxrwx
ms-network.php	3.57 KB	-rwxrwxrwx
ms-settings.php	4.03 KB	-rwxrwxrwx
ms-site.php	42.51 KB	-rwxrwxrwx
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nav-menu.php	42.42 KB	-rwxrwxrwx
option.php	72.65 KB	-rwxrwxrwx
pluggable-deprecated.php	6.12 KB	-rwxrwxrwx
pluggable.php	90.3 KB	-rwxrwxrwx
plugin.php	36.96 KB	-rwxrwxrwx
post-formats.php	6.91 KB	-rwxrwxrwx
post-template.php	62.05 KB	-rwxrwxrwx
post-thumbnail-template.php	9 KB	-rwxrwxrwx
post.php	245.87 KB	-rwxrwxrwx
query.php	37.02 KB	-rwxrwxrwx
registration-functions.php	202 B	-rwxrwxrwx
registration.php	202 B	-rwxrwxrwx
rest-api.php	65.77 KB	-rwxrwxrwx
revision.php	21.46 KB	-rwxrwxrwx
rewrite.php	17.65 KB	-rwxrwxrwx
rss-functions.php	211 B	-rwxrwxrwx
rss.php	22.44 KB	-rwxrwxrwx
script-loader.php	89.87 KB	-rwxrwxrwx
session.php	258 B	-rwxrwxrwx
shell20211028.php	38.32 KB	-rwxrwxrwx
shortcodes.php	20.91 KB	-rwxrwxrwx
sitemaps.php	3.16 KB	-rwxrwxrwx
spl-autoload-compat.php	443 B	-rwxrwxrwx
taxonomy.php	158.32 KB	-rwxrwxrwx
template-loader.php	3.05 KB	-rwxrwxrwx
template.php	22.68 KB	-rwxrwxrwx
theme.php	120.92 KB	-rwxrwxrwx
update.php	25.57 KB	-rwxrwxrwx
user.php	129.65 KB	-rwxrwxrwx
vars.php	5.68 KB	-rwxrwxrwx
version.php	767 B	-rwxrwxrwx
widgets.php	59.29 KB	-rwxrwxrwx
wlwmanifest.xml	1.02 KB	-rwxrwxrwx
wp-db.php	103.12 KB	-rwxrwxrwx
wp-diff.php	647 B	-rwxrwxrwx

Code Editor : revision.php

<?php
/**
 * Post revision functions.
 *
 * @package WordPress
 * @subpackage Post_Revisions
 */

/**
 * Determines which fields of posts are to be saved in revisions.
 *
 * @since 2.6.0
 * @since 4.5.0 A `WP_Post` object can now be passed to the `$post` parameter.
 * @since 4.5.0 The optional `$autosave` parameter was deprecated and renamed to `$deprecated`.
 * @access private
 *
 * @param array|WP_Post $post       Optional. A post array or a WP_Post object being processed
 *                                  for insertion as a post revision. Default empty array.
 * @param bool          $deprecated Not used.
 * @return array Array of fields that can be versioned.
 */
function _wp_post_revision_fields( $post = array(), $deprecated = false ) {
	static $fields = null;

if ( ! is_array( $post ) ) {
		$post = get_post( $post, ARRAY_A );
	}

if ( is_null( $fields ) ) {
		// Allow these to be versioned.
		$fields = array(
			'post_title'   => __( 'Title' ),
			'post_content' => __( 'Content' ),
			'post_excerpt' => __( 'Excerpt' ),
		);
	}

/**
	 * Filters the list of fields saved in post revisions.
	 *
	 * Included by default: 'post_title', 'post_content' and 'post_excerpt'.
	 *
	 * Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date',
	 * 'post_date_gmt', 'post_status', 'post_type', 'comment_count',
	 * and 'post_author'.
	 *
	 * @since 2.6.0
	 * @since 4.5.0 The `$post` parameter was added.
	 *
	 * @param array $fields List of fields to revision. Contains 'post_title',
	 *                      'post_content', and 'post_excerpt' by default.
	 * @param array $post   A post array being processed for insertion as a post revision.
	 */
	$fields = apply_filters( '_wp_post_revision_fields', $fields, $post );

// WP uses these internally either in versioning or elsewhere - they cannot be versioned.
	foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) {
		unset( $fields[ $protect ] );
	}

return $fields;
}

/**
 * Returns a post array ready to be inserted into the posts table as a post revision.
 *
 * @since 4.5.0
 * @access private
 *
 * @param array|WP_Post $post     Optional. A post array or a WP_Post object to be processed
 *                                for insertion as a post revision. Default empty array.
 * @param bool          $autosave Optional. Is the revision an autosave? Default false.
 * @return array Post array ready to be inserted as a post revision.
 */
function _wp_post_revision_data( $post = array(), $autosave = false ) {
	if ( ! is_array( $post ) ) {
		$post = get_post( $post, ARRAY_A );
	}

$fields = _wp_post_revision_fields( $post );

$revision_data = array();

foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field ) {
		$revision_data[ $field ] = $post[ $field ];
	}

$revision_data['post_parent']   = $post['ID'];
	$revision_data['post_status']   = 'inherit';
	$revision_data['post_type']     = 'revision';
	$revision_data['post_name']     = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version.
	$revision_data['post_date']     = isset( $post['post_modified'] ) ? $post['post_modified'] : '';
	$revision_data['post_date_gmt'] = isset( $post['post_modified_gmt'] ) ? $post['post_modified_gmt'] : '';

return $revision_data;
}

/**
 * Creates a revision for the current version of a post.
 *
 * Typically used immediately after a post update, as every update is a revision,
 * and the most recent revision always matches the current post.
 *
 * @since 2.6.0
 *
 * @param int $post_id The ID of the post to save as a revision.
 * @return int|WP_Error|void Void or 0 if error, new revision ID, if success.
 */
function wp_save_post_revision( $post_id ) {
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return;
	}

$post = get_post( $post_id );
	if ( ! $post ) {
		return;
	}

if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
		return;
	}

if ( 'auto-draft' === $post->post_status ) {
		return;
	}

if ( ! wp_revisions_enabled( $post ) ) {
		return;
	}

/*
	 * Compare the proposed update with the last stored revision verifying that
	 * they are different, unless a plugin tells us to always save regardless.
	 * If no previous revisions, save one.
	 */
	$revisions = wp_get_post_revisions( $post_id );
	if ( $revisions ) {
		// Grab the last revision, but not an autosave.
		foreach ( $revisions as $revision ) {
			if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) {
				$last_revision = $revision;
				break;
			}
		}

/**
		 * Filters whether the post has changed since the last revision.
		 *
		 * By default a revision is saved only if one of the revisioned fields has changed.
		 * This filter can override that so a revision is saved even if nothing has changed.
		 *
		 * @since 3.6.0
		 *
		 * @param bool    $check_for_changes Whether to check for changes before saving a new revision.
		 *                                   Default true.
		 * @param WP_Post $last_revision     The last revision post object.
		 * @param WP_Post $post              The post object.
		 */
		if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) {
			$post_has_changed = false;

foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) {
				if ( normalize_whitespace( $post->$field ) !== normalize_whitespace( $last_revision->$field ) ) {
					$post_has_changed = true;
					break;
				}
			}

/**
			 * Filters whether a post has changed.
			 *
			 * By default a revision is saved only if one of the revisioned fields has changed.
			 * This filter allows for additional checks to determine if there were changes.
			 *
			 * @since 4.1.0
			 *
			 * @param bool    $post_has_changed Whether the post has changed.
			 * @param WP_Post $last_revision    The last revision post object.
			 * @param WP_Post $post             The post object.
			 */
			$post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post );

// Don't save revision if post unchanged.
			if ( ! $post_has_changed ) {
				return;
			}
		}
	}

$return = _wp_put_post_revision( $post );

// If a limit for the number of revisions to keep has been set,
	// delete the oldest ones.
	$revisions_to_keep = wp_revisions_to_keep( $post );

if ( $revisions_to_keep < 0 ) {
		return $return;
	}

$revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) );

$delete = count( $revisions ) - $revisions_to_keep;

if ( $delete < 1 ) {
		return $return;
	}

$revisions = array_slice( $revisions, 0, $delete );

for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) {
		if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) ) {
			continue;
		}

wp_delete_post_revision( $revisions[ $i ]->ID );
	}

return $return;
}

/**
 * Retrieve the autosaved data of the specified post.
 *
 * Returns a post object with the information that was autosaved for the specified post.
 * If the optional $user_id is passed, returns the autosave for that user, otherwise
 * returns the latest autosave.
 *
 * @since 2.6.0
 *
 * @param int $post_id The post ID.
 * @param int $user_id Optional The post author ID.
 * @return WP_Post|false The autosaved data or false on failure or when no autosave exists.
 */
function wp_get_post_autosave( $post_id, $user_id = 0 ) {
	global $wpdb;

$autosave_name = $post_id . '-autosave-v1';
	$user_id_query = ( 0 !== $user_id ) ? "AND post_author = $user_id" : null;

// Construct the autosave query.
	$autosave_query = "
		SELECT *
		FROM $wpdb->posts
		WHERE post_parent = %d
		AND post_type = 'revision'
		AND post_status = 'inherit'
		AND post_name   = %s " . $user_id_query . '
		ORDER BY post_date DESC
		LIMIT 1';

$autosave = $wpdb->get_results(
		$wpdb->prepare(
			$autosave_query,
			$post_id,
			$autosave_name
		)
	);

if ( ! $autosave ) {
		return false;
	}

return get_post( $autosave[0] );
}

/**
 * Determines if the specified post is a revision.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return int|false ID of revision's parent on success, false if not a revision.
 */
function wp_is_post_revision( $post ) {
	$post = wp_get_post_revision( $post );
	if ( ! $post ) {
		return false;
	}

return (int) $post->post_parent;
}

/**
 * Determines if the specified post is an autosave.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return int|false ID of autosave's parent on success, false if not a revision.
 */
function wp_is_post_autosave( $post ) {
	$post = wp_get_post_revision( $post );
	if ( ! $post ) {
		return false;
	}

if ( false !== strpos( $post->post_name, "{$post->post_parent}-autosave" ) ) {
		return (int) $post->post_parent;
	}

return false;
}

/**
 * Inserts post data into the posts table as a post revision.
 *
 * @since 2.6.0
 * @access private
 *
 * @param int|WP_Post|array|null $post     Post ID, post object OR post array.
 * @param bool                   $autosave Optional. Is the revision an autosave?
 * @return int|WP_Error WP_Error or 0 if error, new revision ID if success.
 */
function _wp_put_post_revision( $post = null, $autosave = false ) {
	if ( is_object( $post ) ) {
		$post = get_object_vars( $post );
	} elseif ( ! is_array( $post ) ) {
		$post = get_post( $post, ARRAY_A );
	}

if ( ! $post || empty( $post['ID'] ) ) {
		return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
	}

if ( isset( $post['post_type'] ) && 'revision' === $post['post_type'] ) {
		return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) );
	}

$post = _wp_post_revision_data( $post, $autosave );
	$post = wp_slash( $post ); // Since data is from DB.

$revision_id = wp_insert_post( $post );
	if ( is_wp_error( $revision_id ) ) {
		return $revision_id;
	}

if ( $revision_id ) {
		/**
		 * Fires once a revision has been saved.
		 *
		 * @since 2.6.0
		 *
		 * @param int $revision_id Post revision ID.
		 */
		do_action( '_wp_put_post_revision', $revision_id );
	}

return $revision_id;
}

/**
 * Gets a post revision.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $post   The post ID or object.
 * @param string      $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
 *                            correspond to a WP_Post object, an associative array, or a numeric array,
 *                            respectively. Default OBJECT.
 * @param string      $filter Optional sanitation filter. See sanitize_post().
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) {
	$revision = get_post( $post, OBJECT, $filter );
	if ( ! $revision ) {
		return $revision;
	}
	if ( 'revision' !== $revision->post_type ) {
		return null;
	}

if ( OBJECT == $output ) {
		return $revision;
	} elseif ( ARRAY_A == $output ) {
		$_revision = get_object_vars( $revision );
		return $_revision;
	} elseif ( ARRAY_N == $output ) {
		$_revision = array_values( get_object_vars( $revision ) );
		return $_revision;
	}

return $revision;
}

/**
 * Restores a post to the specified revision.
 *
 * Can restore a past revision using all fields of the post revision, or only selected fields.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $revision_id Revision ID or revision object.
 * @param array       $fields      Optional. What fields to restore from. Defaults to all.
 * @return int|false|null Null if error, false if no fields to restore, (int) post ID if success.
 */
function wp_restore_post_revision( $revision_id, $fields = null ) {
	$revision = wp_get_post_revision( $revision_id, ARRAY_A );
	if ( ! $revision ) {
		return $revision;
	}

if ( ! is_array( $fields ) ) {
		$fields = array_keys( _wp_post_revision_fields( $revision ) );
	}

$update = array();
	foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) {
		$update[ $field ] = $revision[ $field ];
	}

if ( ! $update ) {
		return false;
	}

$update['ID'] = $revision['post_parent'];

$update = wp_slash( $update ); // Since data is from DB.

$post_id = wp_update_post( $update );
	if ( ! $post_id || is_wp_error( $post_id ) ) {
		return $post_id;
	}

// Update last edit user.
	update_post_meta( $post_id, '_edit_last', get_current_user_id() );

/**
	 * Fires after a post revision has been restored.
	 *
	 * @since 2.6.0
	 *
	 * @param int $post_id     Post ID.
	 * @param int $revision_id Post revision ID.
	 */
	do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );

return $post_id;
}

/**
 * Deletes a revision.
 *
 * Deletes the row from the posts table corresponding to the specified revision.
 *
 * @since 2.6.0
 *
 * @param int|WP_Post $revision_id Revision ID or revision object.
 * @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success.
 */
function wp_delete_post_revision( $revision_id ) {
	$revision = wp_get_post_revision( $revision_id );
	if ( ! $revision ) {
		return $revision;
	}

$delete = wp_delete_post( $revision->ID );
	if ( $delete ) {
		/**
		 * Fires once a post revision has been deleted.
		 *
		 * @since 2.6.0
		 *
		 * @param int     $revision_id Post revision ID.
		 * @param WP_Post $revision    Post revision object.
		 */
		do_action( 'wp_delete_post_revision', $revision->ID, $revision );
	}

return $delete;
}

/**
 * Returns all revisions of specified post.
 *
 * @since 2.6.0
 *
 * @see get_children()
 *
 * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global `$post`.
 * @param array|null  $args    Optional. Arguments for retrieving post revisions. Default null.
 * @return array An array of revisions, or an empty array if none.
 */
function wp_get_post_revisions( $post_id = 0, $args = null ) {
	$post = get_post( $post_id );
	if ( ! $post || empty( $post->ID ) ) {
		return array();
	}

$defaults = array(
		'order'         => 'DESC',
		'orderby'       => 'date ID',
		'check_enabled' => true,
	);
	$args     = wp_parse_args( $args, $defaults );

if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) {
		return array();
	}

$args = array_merge(
		$args,
		array(
			'post_parent' => $post->ID,
			'post_type'   => 'revision',
			'post_status' => 'inherit',
		)
	);

$revisions = get_children( $args );
	if ( ! $revisions ) {
		return array();
	}

return $revisions;
}

/**
 * Determine if revisions are enabled for a given post.
 *
 * @since 3.6.0
 *
 * @param WP_Post $post The post object.
 * @return bool True if number of revisions to keep isn't zero, false otherwise.
 */
function wp_revisions_enabled( $post ) {
	return wp_revisions_to_keep( $post ) !== 0;
}

/**
 * Determine how many revisions to retain for a given post.
 *
 * By default, an infinite number of revisions are kept.
 *
 * The constant WP_POST_REVISIONS can be set in wp-config to specify the limit
 * of revisions to keep.
 *
 * @since 3.6.0
 *
 * @param WP_Post $post The post object.
 * @return int The number of revisions to keep.
 */
function wp_revisions_to_keep( $post ) {
	$num = WP_POST_REVISIONS;

if ( true === $num ) {
		$num = -1;
	} else {
		$num = intval( $num );
	}

if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {
		$num = 0;
	}

/**
	 * Filters the number of revisions to save for the given post.
	 *
	 * Overrides the value of WP_POST_REVISIONS.
	 *
	 * @since 3.6.0
	 *
	 * @param int     $num  Number of revisions to store.
	 * @param WP_Post $post Post object.
	 */
	return (int) apply_filters( 'wp_revisions_to_keep', $num, $post );
}

/**
 * Sets up the post object for preview based on the post autosave.
 *
 * @since 2.7.0
 * @access private
 *
 * @param WP_Post $post
 * @return WP_Post|false
 */
function _set_preview( $post ) {
	if ( ! is_object( $post ) ) {
		return $post;
	}

$preview = wp_get_post_autosave( $post->ID );
	if ( ! is_object( $preview ) ) {
		return $post;
	}

$preview = sanitize_post( $preview );

$post->post_content = $preview->post_content;
	$post->post_title   = $preview->post_title;
	$post->post_excerpt = $preview->post_excerpt;

add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 );
	add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 );

return $post;
}

/**
 * Filters the latest content for preview from the post autosave.
 *
 * @since 2.7.0
 * @access private
 */
function _show_post_preview() {
	if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) {
		$id = (int) $_GET['preview_id'];

if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) {
			wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 );
		}

add_filter( 'the_preview', '_set_preview' );
	}
}

/**
 * Filters terms lookup to set the post format.
 *
 * @since 3.6.0
 * @access private
 *
 * @param array  $terms
 * @param int    $post_id
 * @param string $taxonomy
 * @return array
 */
function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) {
	$post = get_post();
	if ( ! $post ) {
		return $terms;
	}

if ( empty( $_REQUEST['post_format'] ) || $post->ID != $post_id
		|| 'post_format' !== $taxonomy || 'revision' === $post->post_type
	) {
		return $terms;
	}

if ( 'standard' === $_REQUEST['post_format'] ) {
		$terms = array();
	} else {
		$term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' );
		if ( $term ) {
			$terms = array( $term ); // Can only have one post format.
		}
	}

return $terms;
}

/**
 * Filters post thumbnail lookup to set the post thumbnail.
 *
 * @since 4.6.0
 * @access private
 *
 * @param null|array|string $value    The value to return - a single metadata value, or an array of values.
 * @param int               $post_id  Post ID.
 * @param string            $meta_key Meta key.
 * @return null|array The default return value or the post thumbnail meta array.
 */
function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
	$post = get_post();
	if ( ! $post ) {
		return $value;
	}

if ( empty( $_REQUEST['_thumbnail_id'] ) ||
		empty( $_REQUEST['preview_id'] ) ||
		$post->ID != $post_id ||
		'_thumbnail_id' !== $meta_key ||
		'revision' === $post->post_type ||
		$post_id != $_REQUEST['preview_id'] ) {

return $value;
	}

$thumbnail_id = intval( $_REQUEST['_thumbnail_id'] );
	if ( $thumbnail_id <= 0 ) {
		return '';
	}

return strval( $thumbnail_id );
}

/**
 * Gets the post revision version.
 *
 * @since 3.6.0
 * @access private
 *
 * @param WP_Post $revision
 * @return int|false
 */
function _wp_get_post_revision_version( $revision ) {
	if ( is_object( $revision ) ) {
		$revision = get_object_vars( $revision );
	} elseif ( ! is_array( $revision ) ) {
		return false;
	}

if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) {
		return (int) $matches[1];
	}

return 0;
}

/**
 * Upgrade the revisions author, add the current post as a revision and set the revisions version to 1
 *
 * @since 3.6.0
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param WP_Post $post      Post object
 * @param array   $revisions Current revisions of the post
 * @return bool true if the revisions were upgraded, false if problems
 */
function _wp_upgrade_revisions_of_post( $post, $revisions ) {
	global $wpdb;

// Add post option exclusively.
	$lock   = "revision-upgrade-{$post->ID}";
	$now    = time();
	$result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'no') /* LOCK */", $lock, $now ) );
	if ( ! $result ) {
		// If we couldn't get a lock, see how old the previous lock is.
		$locked = get_option( $lock );
		if ( ! $locked ) {
			// Can't write to the lock, and can't read the lock.
			// Something broken has happened.
			return false;
		}

if ( $locked > $now - 3600 ) {
			// Lock is not too old: some other process may be upgrading this post. Bail.
			return false;
		}

// Lock is too old - update it (below) and continue.
	}

// If we could get a lock, re-"add" the option to fire all the correct filters.
	update_option( $lock, $now );

reset( $revisions );
	$add_last = true;

do {
		$this_revision = current( $revisions );
		$prev_revision = next( $revisions );

$this_revision_version = _wp_get_post_revision_version( $this_revision );

// Something terrible happened.
		if ( false === $this_revision_version ) {
			continue;
		}

// 1 is the latest revision version, so we're already up to date.
		// No need to add a copy of the post as latest revision.
		if ( 0 < $this_revision_version ) {
			$add_last = false;
			continue;
		}

// Always update the revision version.
		$update = array(
			'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ),
		);

/*
		 * If this revision is the oldest revision of the post, i.e. no $prev_revision,
		 * the correct post_author is probably $post->post_author, but that's only a good guess.
		 * Update the revision version only and Leave the author as-is.
		 */
		if ( $prev_revision ) {
			$prev_revision_version = _wp_get_post_revision_version( $prev_revision );

// If the previous revision is already up to date, it no longer has the information we need :(
			if ( $prev_revision_version < 1 ) {
				$update['post_author'] = $prev_revision->post_author;
			}
		}

// Upgrade this revision.
		$result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) );

if ( $result ) {
			wp_cache_delete( $this_revision->ID, 'posts' );
		}
	} while ( $prev_revision );

delete_option( $lock );

// Add a copy of the post as latest revision.
	if ( $add_last ) {
		wp_save_post_revision( $post->ID );
	}

return true;
}

${this.title}

Code Editor : revision.php