Sanitizes a string from user input or from the database.

– Checks for invalid UTF-8,
– Converts single `
– Strips all tags
– Removes line breaks, tabs, and extra whitespace
– Strips octets

function sanitize_text_field( $str ) {
	$filtered = _sanitize_text_fields( $str, false );

	/**
	 * Filters a sanitized text field string.
	 *
	 * @since 2.9.0
	 *
	 * @param string $filtered The sanitized string.
	 * @param string $str      The string prior to being sanitized.
	 */
	return apply_filters( 'sanitize_text_field', $filtered, $str );
}