Escaping for HTML blocks.

function esc_html( $text ) {
	$safe_text = wp_check_invalid_utf8( $text );
	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
	/**
	 * Filters a string cleaned and escaped for output in HTML.
	 *
	 * Text passed to esc_html() is stripped of invalid or special characters
	 * before output.
	 *
	 * @since 2.8.0
	 *
	 * @param string $safe_text The text after it has been escaped.
	 * @param string $text      The text prior to being escaped.
	 */
	return apply_filters( 'esc_html', $safe_text, $text );
}