Call custom function from shortcode

wp-shortcode-function.php

add_shortcode( 'call_function', 'custom_function_call' );

/**
 * @param $attributes
 * $attributes['name'] - function name to call
 * $attributes['args'] - arguments to be passed
 * @return string
 */
function custom_function_call( $attributes ) {
	$pattern = false;
	$attributes = shortcode_atts( array(
		'name' => false,
		'args' => '',
	), $attributes );

	$name = $attributes['name'];

	if(
		$name &&
		function_exists($name) &&
		(!$pattern || preg_match($pattern, $name ))
	){
		$params = array_map('trim', explode(',', $attributes['args']));
		ob_start();
		echo call_user_func_array($name, $params);
		return ob_get_clean();
	}

	return '';
}