Polylang shortcode for lang switcher

polylang-langswitcher-shortcode.php

<?php
/**
 * Polylang Shortcode - https://wordpress.org/plugins/polylang/
 * Add this code in your functions.php
 * Put shortcode [polylang_langswitcher] to post/page for display flags inline-block
 *
 * @return string
 */
function custom_polylang_langswitcher() {
	$output = '';
	if ( function_exists( 'pll_the_languages' ) ) {
		$args   = [
			'show_flags' => 1,
			'show_names' => 0,
			'echo'       => 0,
		];
		$output = '<style> .polylang_langswitcher {margin:0; list-style:none;}
				   .polylang_langswitcher li {display:inline-block; float:none; margin-left:0px;}
				   .polylang_langswitcher li:not(:last-child) {margin-right:20px;}
				   .polylang_langswitcher li a span {margin-left:0em !important;}
			   </style>
			   <ul class="polylang_langswitcher">'.pll_the_languages( $args ). '</ul>';
	}

	return $output;
}

add_shortcode( 'polylang_langswitcher', 'custom_polylang_langswitcher' );