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Back Back Up Advanced Editor

<?php
/**
 * Facilitates adding of the WordPress editor as used on the Write and Edit screens.
 *
 * @package WordPress
 * @since 3.3.0
 *
 * Private, not included by default. See wp_editor() in wp-includes/general-template.php.
 */

#[AllowDynamicProperties]
final class _WP_Editors {
	public static $mce_locale;

private static $mce_settings = array();
	private static $qt_settings  = array();
	private static $plugins      = array();
	private static $qt_buttons   = array();
	private static $ext_plugins;
	private static $baseurl;
	private static $first_init;
	private static $this_tinymce       = false;
	private static $this_quicktags     = false;
	private static $has_tinymce        = false;
	private static $has_quicktags      = false;
	private static $has_medialib       = false;
	private static $editor_buttons_css = true;
	private static $drag_drop_upload   = false;
	private static $translation;
	private static $tinymce_scripts_printed = false;
	private static $link_dialog_printed     = false;

private function __construct() {}

/**
	 * Parse default arguments for the editor instance.
	 *
	 * @since 3.3.0
	 *
	 * @param string $editor_id HTML ID for the textarea and TinyMCE and Quicktags instances.
	 *                          Should not contain square brackets.
	 * @param array  $settings {
	 *     Array of editor arguments.
	 *
	 *     @type bool       $wpautop           Whether to use wpautop(). Default true.
	 *     @type bool       $media_buttons     Whether to show the Add Media/other media buttons.
	 *     @type string     $default_editor    When both TinyMCE and Quicktags are used, set which
	 *                                         editor is shown on page load. Default empty.
	 *     @type bool       $drag_drop_upload  Whether to enable drag & drop on the editor uploading. Default false.
	 *                                         Requires the media modal.
	 *     @type string     $textarea_name     Give the textarea a unique name here. Square brackets
	 *                                         can be used here. Default $editor_id.
	 *     @type int        $textarea_rows     Number rows in the editor textarea. Default 20.
	 *     @type string|int $tabindex          Tabindex value to use. Default empty.
	 *     @type string     $tabfocus_elements The previous and next element ID to move the focus to
	 *                                         when pressing the Tab key in TinyMCE. Default ':prev,:next'.
	 *     @type string     $editor_css        Intended for extra styles for both Visual and Text editors.
	 *                                         Should include `<style>` tags, and can use "scoped". Default empty.
	 *     @type string     $editor_class      Extra classes to add to the editor textarea element. Default empty.
	 *     @type bool       $teeny             Whether to output the minimal editor config. Examples include
	 *                                         Press This and the Comment editor. Default false.
	 *     @type bool       $dfw               Deprecated in 4.1. Unused.
	 *     @type bool|array $tinymce           Whether to load TinyMCE. Can be used to pass settings directly to
	 *                                         TinyMCE using an array. Default true.
	 *     @type bool|array $quicktags         Whether to load Quicktags. Can be used to pass settings directly to
	 *                                         Quicktags using an array. Default true.
	 * }
	 * @return array Parsed arguments array.
	 */
	public static function parse_settings( $editor_id, $settings ) {

/**
		 * Filters the wp_editor() settings.
		 *
		 * @since 4.0.0
		 *
		 * @see _WP_Editors::parse_settings()
		 *
		 * @param array  $settings  Array of editor arguments.
		 * @param string $editor_id Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
		 *                          when called from block editor's Classic block.
		 */
		$settings = apply_filters( 'wp_editor_settings', $settings, $editor_id );

$set = wp_parse_args(
			$settings,
			array(
				// Disable autop if the current post has blocks in it.
				'wpautop'             => ! has_blocks(),
				'media_buttons'       => true,
				'default_editor'      => '',
				'drag_drop_upload'    => false,
				'textarea_name'       => $editor_id,
				'textarea_rows'       => 20,
				'tabindex'            => '',
				'tabfocus_elements'   => ':prev,:next',
				'editor_css'          => '',
				'editor_class'        => '',
				'teeny'               => false,
				'_content_editor_dfw' => false,
				'tinymce'             => true,
				'quicktags'           => true,
			)
		);

self::$this_tinymce = ( $set['tinymce'] && user_can_richedit() );

if ( self::$this_tinymce ) {
			if ( str_contains( $editor_id, '[' ) ) {
				self::$this_tinymce = false;
				_deprecated_argument( 'wp_editor()', '3.9.0', 'TinyMCE editor IDs cannot have brackets.' );
			}
		}

self::$this_quicktags = (bool) $set['quicktags'];

if ( self::$this_tinymce ) {
			self::$has_tinymce = true;
		}

if ( self::$this_quicktags ) {
			self::$has_quicktags = true;
		}

if ( empty( $set['editor_height'] ) ) {
			return $set;
		}

if ( 'content' === $editor_id && empty( $set['tinymce']['wp_autoresize_on'] ) ) {
			// A cookie (set when a user resizes the editor) overrides the height.
			$cookie = (int) get_user_setting( 'ed_size' );

if ( $cookie ) {
				$set['editor_height'] = $cookie;
			}
		}

if ( $set['editor_height'] < 50 ) {
			$set['editor_height'] = 50;
		} elseif ( $set['editor_height'] > 5000 ) {
			$set['editor_height'] = 5000;
		}

return $set;
	}

/**
	 * Outputs the HTML for a single instance of the editor.
	 *
	 * @since 3.3.0
	 *
	 * @global WP_Screen $current_screen WordPress current screen object.
	 *
	 * @param string $content   Initial content for the editor.
	 * @param string $editor_id HTML ID for the textarea and TinyMCE and Quicktags instances.
	 *                          Should not contain square brackets.
	 * @param array  $settings  See _WP_Editors::parse_settings() for description.
	 */
	public static function editor( $content, $editor_id, $settings = array() ) {
		$set            = self::parse_settings( $editor_id, $settings );
		$editor_class   = ' class="' . trim( esc_attr( $set['editor_class'] ) . ' wp-editor-area' ) . '"';
		$tabindex       = $set['tabindex'] ? ' tabindex="' . (int) $set['tabindex'] . '"' : '';
		$default_editor = 'html';
		$buttons        = '';
		$autocomplete   = '';
		$editor_id_attr = esc_attr( $editor_id );

if ( $set['drag_drop_upload'] ) {
			self::$drag_drop_upload = true;
		}

if ( ! empty( $set['editor_height'] ) ) {
			$height = ' style="height: ' . (int) $set['editor_height'] . 'px"';
		} else {
			$height = ' rows="' . (int) $set['textarea_rows'] . '"';
		}

if ( ! current_user_can( 'upload_files' ) ) {
			$set['media_buttons'] = false;
		}

if ( self::$this_tinymce ) {
			$autocomplete = ' autocomplete="off"';

if ( self::$this_quicktags ) {
				$default_editor = $set['default_editor'] ? $set['default_editor'] : wp_default_editor();
				// 'html' is used for the "Text" editor tab.
				if ( 'html' !== $default_editor ) {
					$default_editor = 'tinymce';
				}

$buttons .= '<button type="button" id="' . $editor_id_attr . '-tmce" class="wp-switch-editor switch-tmce"' .
					' data-wp-editor-id="' . $editor_id_attr . '">' . _x( 'Visual', 'Name for the Visual editor tab' ) . "</button>\n";
				$buttons .= '<button type="button" id="' . $editor_id_attr . '-html" class="wp-switch-editor switch-html"' .
					' data-wp-editor-id="' . $editor_id_attr . '">' . _x( 'Text', 'Name for the Text editor tab (formerly HTML)' ) . "</button>\n";
			} else {
				$default_editor = 'tinymce';
			}
		}

$switch_class = 'html' === $default_editor ? 'html-active' : 'tmce-active';
		$wrap_class   = 'wp-core-ui wp-editor-wrap ' . $switch_class;

if ( $set['_content_editor_dfw'] ) {
			$wrap_class .= ' has-dfw';
		}

echo '<div id="wp-' . $editor_id_attr . '-wrap" class="' . $wrap_class . '">';

if ( self::$editor_buttons_css ) {
			wp_print_styles( 'editor-buttons' );
			self::$editor_buttons_css = false;
		}

if ( ! empty( $set['editor_css'] ) ) {
			echo $set['editor_css'] . "\n";
		}

if ( ! empty( $buttons ) || $set['media_buttons'] ) {
			echo '<div id="wp-' . $editor_id_attr . '-editor-tools" class="wp-editor-tools hide-if-no-js">';

if ( $set['media_buttons'] ) {
				self::$has_medialib = true;

if ( ! function_exists( 'media_buttons' ) ) {
					require ABSPATH . 'wp-admin/includes/media.php';
				}

echo '<div id="wp-' . $editor_id_attr . '-media-buttons" class="wp-media-buttons">';

/**
				 * Fires after the default media button(s) are displayed.
				 *
				 * @since 2.5.0
				 *
				 * @param string $editor_id Unique editor identifier, e.g. 'content'.
				 */
				do_action( 'media_buttons', $editor_id );
				echo "</div>\n";
			}

echo '<div class="wp-editor-tabs">' . $buttons . "</div>\n";
			echo "</div>\n";
		}

$quicktags_toolbar = '';

if ( self::$this_quicktags ) {
			if ( 'content' === $editor_id && ! empty( $GLOBALS['current_screen'] ) && 'post' === $GLOBALS['current_screen']->base ) {
				$toolbar_id = 'ed_toolbar';
			} else {
				$toolbar_id = 'qt_' . $editor_id_attr . '_toolbar';
			}

$quicktags_toolbar = '<div id="' . $toolbar_id . '" class="quicktags-toolbar hide-if-no-js"></div>';
		}

/**
		 * Filters the HTML markup output that displays the editor.
		 *
		 * @since 2.1.0
		 *
		 * @param string $output Editor's HTML markup.
		 */
		$the_editor = apply_filters(
			'the_editor',
			'<div id="wp-' . $editor_id_attr . '-editor-container" class="wp-editor-container">' .
			$quicktags_toolbar .
			'<textarea' . $editor_class . $height . $tabindex . $autocomplete . ' cols="40" name="' . esc_attr( $set['textarea_name'] ) . '" ' .
			'id="' . $editor_id_attr . '">%s</textarea></div>'
		);

// Prepare the content for the Visual or Text editor, only when TinyMCE is used (back-compat).
		if ( self::$this_tinymce ) {
			add_filter( 'the_editor_content', 'format_for_editor', 10, 2 );
		}

/**
		 * Filters the default editor content.
		 *
		 * @since 2.1.0
		 *
		 * @param string $content        Default editor content.
		 * @param string $default_editor The default editor for the current user.
		 *                               Either 'html' or 'tinymce'.
		 */
		$content = apply_filters( 'the_editor_content', $content, $default_editor );

// Remove the filter as the next editor on the same page may not need it.
		if ( self::$this_tinymce ) {
			remove_filter( 'the_editor_content', 'format_for_editor' );
		}

// Back-compat for the `htmledit_pre` and `richedit_pre` filters.
		if ( 'html' === $default_editor && has_filter( 'htmledit_pre' ) ) {
			/** This filter is documented in wp-includes/deprecated.php */
			$content = apply_filters_deprecated( 'htmledit_pre', array( $content ), '4.3.0', 'format_for_editor' );
		} elseif ( 'tinymce' === $default_editor && has_filter( 'richedit_pre' ) ) {
			/** This filter is documented in wp-includes/deprecated.php */
			$content = apply_filters_deprecated( 'richedit_pre', array( $content ), '4.3.0', 'format_for_editor' );
		}

if ( false !== stripos( $content, 'textarea' ) ) {
			$content = preg_replace( '%</textarea%i', '&lt;/textarea', $content );
		}

printf( $the_editor, $content );
		echo "\n</div>\n\n";

self::editor_settings( $editor_id, $set );
	}

/**
	 * @since 3.3.0
	 *
	 * @param string $editor_id Unique editor identifier, e.g. 'content'.
	 * @param array  $set       Array of editor arguments.
	 */
	public static function editor_settings( $editor_id, $set ) {
		if ( empty( self::$first_init ) ) {
			if ( is_admin() ) {
				add_action( 'admin_print_footer_scripts', array( __CLASS__, 'editor_js' ), 50 );
				add_action( 'admin_print_footer_scripts', array( __CLASS__, 'force_uncompressed_tinymce' ), 1 );
				add_action( 'admin_print_footer_scripts', array( __CLASS__, 'enqueue_scripts' ), 1 );
			} else {
				add_action( 'wp_print_footer_scripts', array( __CLASS__, 'editor_js' ), 50 );
				add_action( 'wp_print_footer_scripts', array( __CLASS__, 'force_uncompressed_tinymce' ), 1 );
				add_action( 'wp_print_footer_scripts', array( __CLASS__, 'enqueue_scripts' ), 1 );
			}
		}

if ( self::$this_quicktags ) {

$qt_init = array(
				'id'      => $editor_id,
				'buttons' => '',
			);

if ( is_array( $set['quicktags'] ) ) {
				$qt_init = array_merge( $qt_init, $set['quicktags'] );
			}

if ( empty( $qt_init['buttons'] ) ) {
				$qt_init['buttons'] = 'strong,em,link,block,del,ins,img,ul,ol,li,code,more,close';
			}

if ( $set['_content_editor_dfw'] ) {
				$qt_init['buttons'] .= ',dfw';
			}

/**
			 * Filters the Quicktags settings.
			 *
			 * @since 3.3.0
			 *
			 * @param array  $qt_init   Quicktags settings.
			 * @param string $editor_id Unique editor identifier, e.g. 'content'.
			 */
			$qt_init = apply_filters( 'quicktags_settings', $qt_init, $editor_id );

self::$qt_settings[ $editor_id ] = $qt_init;

self::$qt_buttons = array_merge( self::$qt_buttons, explode( ',', $qt_init['buttons'] ) );
		}

if ( self::$this_tinymce ) {

if ( empty( self::$first_init ) ) {
				$baseurl     = self::get_baseurl();
				$mce_locale  = self::get_mce_locale();
				$ext_plugins = '';

if ( $set['teeny'] ) {

/**
					 * Filters the list of teenyMCE plugins.
					 *
					 * @since 2.7.0
					 * @since 3.3.0 The `$editor_id` parameter was added.
					 *
					 * @param array  $plugins   An array of teenyMCE plugins.
					 * @param string $editor_id Unique editor identifier, e.g. 'content'.
					 */
					$plugins = apply_filters(
						'teeny_mce_plugins',
						array(
							'colorpicker',
							'lists',
							'fullscreen',
							'image',
							'wordpress',
							'wpeditimage',
							'wplink',
						),
						$editor_id
					);
				} else {

/**
					 * Filters the list of TinyMCE external plugins.
					 *
					 * The filter takes an associative array of external plugins for
					 * TinyMCE in the form 'plugin_name' => 'url'.
					 *
					 * The url should be absolute, and should include the js filename
					 * to be loaded. For example:
					 * 'myplugin' => 'http://mysite.com/wp-content/plugins/myfolder/mce_plugin.js'.
					 *
					 * If the external plugin adds a button, it should be added with
					 * one of the 'mce_buttons' filters.
					 *
					 * @since 2.5.0
					 * @since 5.3.0 The `$editor_id` parameter was added.
					 *
					 * @param array  $external_plugins An array of external TinyMCE plugins.
					 * @param string $editor_id        Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
					 *                                 when called from block editor's Classic block.
					 */
					$mce_external_plugins = apply_filters( 'mce_external_plugins', array(), $editor_id );

$plugins = array(
						'charmap',
						'colorpicker',
						'hr',
						'lists',
						'media',
						'paste',
						'tabfocus',
						'textcolor',
						'fullscreen',
						'wordpress',
						'wpautoresize',
						'wpeditimage',
						'wpemoji',
						'wpgallery',
						'wplink',
						'wpdialogs',
						'wptextpattern',
						'wpview',
					);

if ( ! self::$has_medialib ) {
						$plugins[] = 'image';
					}

/**
					 * Filters the list of default TinyMCE plugins.
					 *
					 * The filter specifies which of the default plugins included
					 * in WordPress should be added to the TinyMCE instance.
					 *
					 * @since 3.3.0
					 * @since 5.3.0 The `$editor_id` parameter was added.
					 *
					 * @param array  $plugins   An array of default TinyMCE plugins.
					 * @param string $editor_id Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
					 *                          when called from block editor's Classic block.
					 */
					$plugins = array_unique( apply_filters( 'tiny_mce_plugins', $plugins, $editor_id ) );

$key = array_search( 'spellchecker', $plugins, true );
					if ( false !== $key ) {
						/*
						 * Remove 'spellchecker' from the internal plugins if added with 'tiny_mce_plugins' filter to prevent errors.
						 * It can be added with 'mce_external_plugins'.
						 */
						unset( $plugins[ $key ] );
					}

if ( ! empty( $mce_external_plugins ) ) {

/**
						 * Filters the translations loaded for external TinyMCE 3.x plugins.
						 *
						 * The filter takes an associative array ('plugin_name' => 'path')
						 * where 'path' is the include path to the file.
						 *
						 * The language file should follow the same format as wp_mce_translation(),
						 * and should define a variable ($strings) that holds all translated strings.
						 *
						 * @since 2.5.0
						 * @since 5.3.0 The `$editor_id` parameter was added.
						 *
						 * @param array  $translations Translations for external TinyMCE plugins.
						 * @param string $editor_id    Unique editor identifier, e.g. 'content'.
						 */
						$mce_external_languages = apply_filters( 'mce_external_languages', array(), $editor_id );

$loaded_langs = array();
						$strings      = '';

if ( ! empty( $mce_external_languages ) ) {
							foreach ( $mce_external_languages as $name => $path ) {
								if ( @is_file( $path ) && @is_readable( $path ) ) {
									include_once $path;
									$ext_plugins   .= $strings . "\n";
									$loaded_langs[] = $name;
								}
							}
						}

foreach ( $mce_external_plugins as $name => $url ) {
							if ( in_array( $name, $plugins, true ) ) {
								unset( $mce_external_plugins[ $name ] );
								continue;
							}

$url                           = set_url_scheme( $url );
							$mce_external_plugins[ $name ] = $url;
							$plugurl                       = dirname( $url );
							$strings                       = '';

// Try to load langs/[locale].js and langs/[locale]_dlg.js.
							if ( ! in_array( $name, $loaded_langs, true ) ) {
								$path = str_replace( content_url(), '', $plugurl );
								$path = realpath( WP_CONTENT_DIR . $path . '/langs/' );

if ( ! $path ) {
									continue;
								}

$path = trailingslashit( $path );

if ( @is_file( $path . $mce_locale . '.js' ) ) {
									$strings .= @file_get_contents( $path . $mce_locale . '.js' ) . "\n";
								}

if ( @is_file( $path . $mce_locale . '_dlg.js' ) ) {
									$strings .= @file_get_contents( $path . $mce_locale . '_dlg.js' ) . "\n";
								}

if ( 'en' !== $mce_locale && empty( $strings ) ) {
									if ( @is_file( $path . 'en.js' ) ) {
										$str1     = @file_get_contents( $path . 'en.js' );
										$strings .= preg_replace( '/([\'"])en\./', '$1' . $mce_locale . '.', $str1, 1 ) . "\n";
									}

if ( @is_file( $path . 'en_dlg.js' ) ) {
										$str2     = @file_get_contents( $path . 'en_dlg.js' );
										$strings .= preg_replace( '/([\'"])en\./', '$1' . $mce_locale . '.', $str2, 1 ) . "\n";
									}
								}

if ( ! empty( $strings ) ) {
									$ext_plugins .= "\n" . $strings . "\n";
								}
							}

$ext_plugins .= 'tinyMCEPreInit.load_ext("' . $plugurl . '", "' . $mce_locale . '");' . "\n";
						}
					}
				}

self::$plugins     = $plugins;
				self::$ext_plugins = $ext_plugins;

$settings            = self::default_settings();
				$settings['plugins'] = implode( ',', $plugins );

if ( ! empty( $mce_external_plugins ) ) {
					$settings['external_plugins'] = wp_json_encode( $mce_external_plugins );
				}

/** This filter is documented in wp-admin/includes/media.php */
				if ( apply_filters( 'disable_captions', '' ) ) {
					$settings['wpeditimage_disable_captions'] = true;
				}

$mce_css = $settings['content_css'];

/*
				 * The `editor-style.css` added by the theme is generally intended for the editor instance on the Edit Post screen.
				 * Plugins that use wp_editor() on the front-end can decide whether to add the theme stylesheet
				 * by using `get_editor_stylesheets()` and the `mce_css` or `tiny_mce_before_init` filters, see below.
				 */
				if ( is_admin() ) {
					$editor_styles = get_editor_stylesheets();

if ( ! empty( $editor_styles ) ) {
						// Force urlencoding of commas.
						foreach ( $editor_styles as $key => $url ) {
							if ( str_contains( $url, ',' ) ) {
								$editor_styles[ $key ] = str_replace( ',', '%2C', $url );
							}
						}

$mce_css .= ',' . implode( ',', $editor_styles );
					}
				}

/**
				 * Filters the comma-delimited list of stylesheets to load in TinyMCE.
				 *
				 * @since 2.1.0
				 *
				 * @param string $stylesheets Comma-delimited list of stylesheets.
				 */
				$mce_css = trim( apply_filters( 'mce_css', $mce_css ), ' ,' );

if ( ! empty( $mce_css ) ) {
					$settings['content_css'] = $mce_css;
				} else {
					unset( $settings['content_css'] );
				}

self::$first_init = $settings;
			}

if ( $set['teeny'] ) {
				$mce_buttons = array(
					'bold',
					'italic',
					'underline',
					'blockquote',
					'strikethrough',
					'bullist',
					'numlist',
					'alignleft',
					'aligncenter',
					'alignright',
					'undo',
					'redo',
					'link',
					'fullscreen',
				);

/**
				 * Filters the list of teenyMCE buttons (Text tab).
				 *
				 * @since 2.7.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_buttons An array of teenyMCE buttons.
				 * @param string $editor_id   Unique editor identifier, e.g. 'content'.
				 */
				$mce_buttons   = apply_filters( 'teeny_mce_buttons', $mce_buttons, $editor_id );
				$mce_buttons_2 = array();
				$mce_buttons_3 = array();
				$mce_buttons_4 = array();
			} else {
				$mce_buttons = array(
					'formatselect',
					'bold',
					'italic',
					'bullist',
					'numlist',
					'blockquote',
					'alignleft',
					'aligncenter',
					'alignright',
					'link',
					'wp_more',
					'spellchecker',
				);

if ( ! wp_is_mobile() ) {
					if ( $set['_content_editor_dfw'] ) {
						$mce_buttons[] = 'wp_adv';
						$mce_buttons[] = 'dfw';
					} else {
						$mce_buttons[] = 'fullscreen';
						$mce_buttons[] = 'wp_adv';
					}
				} else {
					$mce_buttons[] = 'wp_adv';
				}

/**
				 * Filters the first-row list of TinyMCE buttons (Visual tab).
				 *
				 * @since 2.0.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_buttons First-row list of buttons.
				 * @param string $editor_id   Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
				 *                            when called from block editor's Classic block.
				 */
				$mce_buttons = apply_filters( 'mce_buttons', $mce_buttons, $editor_id );

$mce_buttons_2 = array(
					'strikethrough',
					'hr',
					'forecolor',
					'pastetext',
					'removeformat',
					'charmap',
					'outdent',
					'indent',
					'undo',
					'redo',
				);

if ( ! wp_is_mobile() ) {
					$mce_buttons_2[] = 'wp_help';
				}

/**
				 * Filters the second-row list of TinyMCE buttons (Visual tab).
				 *
				 * @since 2.0.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_buttons_2 Second-row list of buttons.
				 * @param string $editor_id     Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
				 *                              when called from block editor's Classic block.
				 */
				$mce_buttons_2 = apply_filters( 'mce_buttons_2', $mce_buttons_2, $editor_id );

/**
				 * Filters the third-row list of TinyMCE buttons (Visual tab).
				 *
				 * @since 2.0.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_buttons_3 Third-row list of buttons.
				 * @param string $editor_id     Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
				 *                              when called from block editor's Classic block.
				 */
				$mce_buttons_3 = apply_filters( 'mce_buttons_3', array(), $editor_id );

/**
				 * Filters the fourth-row list of TinyMCE buttons (Visual tab).
				 *
				 * @since 2.5.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_buttons_4 Fourth-row list of buttons.
				 * @param string $editor_id     Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
				 *                              when called from block editor's Classic block.
				 */
				$mce_buttons_4 = apply_filters( 'mce_buttons_4', array(), $editor_id );
			}

$body_class = $editor_id;

$post = get_post();
			if ( $post ) {
				$body_class .= ' post-type-' . sanitize_html_class( $post->post_type ) . ' post-status-' . sanitize_html_class( $post->post_status );

if ( post_type_supports( $post->post_type, 'post-formats' ) ) {
					$post_format = get_post_format( $post );
					if ( $post_format && ! is_wp_error( $post_format ) ) {
						$body_class .= ' post-format-' . sanitize_html_class( $post_format );
					} else {
						$body_class .= ' post-format-standard';
					}
				}

$page_template = get_page_template_slug( $post );

if ( false !== $page_template ) {
					$page_template = empty( $page_template ) ? 'default' : str_replace( '.', '-', basename( $page_template, '.php' ) );
					$body_class   .= ' page-template-' . sanitize_html_class( $page_template );
				}
			}

$body_class .= ' locale-' . sanitize_html_class( strtolower( str_replace( '_', '-', get_user_locale() ) ) );

if ( ! empty( $set['tinymce']['body_class'] ) ) {
				$body_class .= ' ' . $set['tinymce']['body_class'];
				unset( $set['tinymce']['body_class'] );
			}

$mce_init = array(
				'selector'          => "#$editor_id",
				'wpautop'           => (bool) $set['wpautop'],
				'indent'            => ! $set['wpautop'],
				'toolbar1'          => implode( ',', $mce_buttons ),
				'toolbar2'          => implode( ',', $mce_buttons_2 ),
				'toolbar3'          => implode( ',', $mce_buttons_3 ),
				'toolbar4'          => implode( ',', $mce_buttons_4 ),
				'tabfocus_elements' => $set['tabfocus_elements'],
				'body_class'        => $body_class,
			);

// Merge with the first part of the init array.
			$mce_init = array_merge( self::$first_init, $mce_init );

if ( is_array( $set['tinymce'] ) ) {
				$mce_init = array_merge( $mce_init, $set['tinymce'] );
			}

/*
			 * For people who really REALLY know what they're doing with TinyMCE
			 * You can modify $mceInit to add, remove, change elements of the config
			 * before tinyMCE.init. Setting "valid_elements", "invalid_elements"
			 * and "extended_valid_elements" can be done through this filter. Best
			 * is to use the default cleanup by not specifying valid_elements,
			 * as TinyMCE checks against the full set of HTML 5.0 elements and attributes.
			 */
			if ( $set['teeny'] ) {

/**
				 * Filters the teenyMCE config before init.
				 *
				 * @since 2.7.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_init  An array with teenyMCE config.
				 * @param string $editor_id Unique editor identifier, e.g. 'content'.
				 */
				$mce_init = apply_filters( 'teeny_mce_before_init', $mce_init, $editor_id );
			} else {

/**
				 * Filters the TinyMCE config before init.
				 *
				 * @since 2.5.0
				 * @since 3.3.0 The `$editor_id` parameter was added.
				 *
				 * @param array  $mce_init  An array with TinyMCE config.
				 * @param string $editor_id Unique editor identifier, e.g. 'content'. Accepts 'classic-block'
				 *                          when called from block editor's Classic block.
				 */
				$mce_init = apply_filters( 'tiny_mce_before_init', $mce_init, $editor_id );
			}

if ( empty( $mce_init['toolbar3'] ) && ! empty( $mce_init['toolbar4'] ) ) {
				$mce_init['toolbar3'] = $mce_init['toolbar4'];
				$mce_init['toolbar4'] = '';
			}

self::$mce_settings[ $editor_id ] = $mce_init;
		} // End if self::$this_tinymce.
	}

/**
	 * @since 3.3.0
	 *
	 * @param array $init
	 * @return string
	 */
	private static function _parse_init( $init ) {
		$options = '';

foreach ( $init as $key => $value ) {
			if ( is_bool( $value ) ) {
				$val      = $value ? 'true' : 'false';
				$options .= $key . ':' . $val . ',';
				continue;
			} elseif ( ! empty( $value ) && is_string( $value ) && (
				( '{' === $value[0] && '}' === $value[ strlen( $value ) - 1 ] ) ||
				( '[' === $value[0] && ']' === $value[ strlen( $value ) - 1 ] ) ||
				preg_match( '/^\(?function ?\(/', $value ) ) ) {

$options .= $key . ':' . $value . ',';
				continue;
			}
			$options .= $key . ':"' . $v