<?php
	function my_rating( $atts ) {
		$rating = shortcode_atts( array(
			'stars'  => '',
			'half'   => 'false',
		), $atts );

		$star      = esc_attr($rating['stars']);
		$stars     = str_repeat('<i class="fas fa-fw fa-star"></i>', $star);
		$half      = esc_attr($rating['half']);
		$halfstar  = '<i class="fas fa-fw fa-star-half-alt"></i>';
		$dif       = 5 - esc_attr($rating['stars']);
		$empty     = str_repeat('<i class="far fa-fw fa-star"></i>', $dif);
		$difhalf   = 4 - esc_attr($rating['stars']);
		$emptyhalf = str_repeat('<i class="far fa-fw fa-star"></i>', $difhalf);

		if ( $half == 'false' ) {
			return $stars . $empty . '<span class="hide" aria-hidden="false">' . $star .'.0 out of 5</span> <span class="lining" aria-hidden="true">' . $star .'.0</span>';
		}
		elseif ( ( $half == 'true' ) && ( $star < 5 ) ) {
			return $stars . $halfstar . $emptyhalf . '<span class="hide" aria-hidden="false">' . $star .'.5 out of 5</span> <span class="lining" aria-hidden="true">' . $star .'.5</span>';
		} else {
			// 5 stars is maximum. 5½ stars outputs 5 stars.
			return $stars . $empty . '<span class="hide" aria-hidden="false">5.0 out of 5</span> <span class="lining" aria-hidden="true">5.0</span>';
		}

	}

	add_shortcode( 'rating', 'my_rating' );