PHP snippet not executing polylang

I am using Polylang on Local developed wordpress website. I am trying to create a shortcode and later invoke it for Polylang flags with slugs in Neve theme header.

This is my code:

<?php
	function polylang_shortcode() {
		ob_start();		 
pll_the_languages(array(‘show_flags’=>1,’show_names’=>1,‘display_names_as’ => ‘slug’));
		$flags = ob_get_clean();
		return $flags;
}

if (function_exists('pll_the_languages'))
{
add_shortcode(‘polylang’, ‘polylang_shortcode’);
};
?>

I invoke it with [polylang], but it does nothing but print exact string, “[polylang]”.

Does anyone know what to do?