对一个字符串键进行净化。

键被用作内部标识符。允许小写字母数字字符、破折号和下划线。

function sanitize_key( $key ) {
	$sanitized_key = '';

	if ( is_scalar( $key ) ) {
		$sanitized_key = strtolower( $key );
		$sanitized_key = preg_replace( '/[^a-z0-9_-]/', '', $sanitized_key );
	}

	/**
	 * Filters a sanitized key string.
	 *
	 * @since 3.0.0
	 *
	 * @param string $sanitized_key Sanitized key.
	 * @param string $key           The key prior to sanitization.
	 */
	return apply_filters( 'sanitize_key', $sanitized_key, $key );
}