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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 240 |           } | 
| 241 |  | 
| 242 |           /** | 
| 243 |            * Filter the HTML markup output that displays the editor. | 
| 244 |            * | 
| 245 |            * @since 2.1.0 | 
| 246 |            * | 
| 247 |            * @param string $output Editor's HTML markup. | 
| 248 |            */ | 
| 249 |           $the_editor = apply_filters( 'the_editor', '<div id="wp-' . $editor_id_attr . '-editor-container" class="wp-editor-container">' . | 
| 250 |                $quicktags_toolbar . | 
| 251 |                '<textarea' . $editor_class . $height . $tabindex . $autocomplete . ' cols="40" name="' . esc_attr( $set['textarea_name'] ) . '" ' . | 
| 252 |                'id="' . $editor_id_attr . '">%s</textarea></div>' ); | 
| 253 |  | 
| 254 |           // Prepare the content for the Visual or Text editor, only when TinyMCE is used (back-compat). | 
| 255 |           if ( self::$this_tinymce ) { | 
| 256 |                add_filter( 'the_editor_content', 'format_for_editor', 10, 2 ); | 
| 257 |           } | 
| 258 |  |