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function is not described

format_for_editor() WP 4.3.0

Formats text for the editor.

Generally the browsers treat everything inside a textarea as text, but it is still a good idea to HTML entity encode <, > and & in the content.

The filter format_for_editor is applied here. If $text is empty the filter will be applied to an empty string.

Hooks from the function

Return

String. The formatted text after filter is applied.

Usage

format_for_editor( $text, $default_editor );
$text(string) (required)
The text to be formatted.
$default_editor(string)
The default editor for the current user. It is usually either 'html' or 'tinymce'.
Default: null

Notes

Code of format_for_editor() WP 5.8.3

function format_for_editor( $text, $default_editor = null ) {
	if ( $text ) {
		$text = htmlspecialchars( $text, ENT_NOQUOTES, get_option( 'blog_charset' ) );
	}

	/**
	 * Filters the text after it is formatted for the editor.
	 *
	 * @since 4.3.0
	 *
	 * @param string $text           The formatted text.
	 * @param string $default_editor The default editor for the current user.
	 *                               It is usually either 'html' or 'tinymce'.
	 */
	return apply_filters( 'format_for_editor', $text, $default_editor );
}