Random Quote generator using api.quotable.io in PHP

quote.php

<?php
function get_random_quotes() {
	$api_url  = 'https://api.quotable.io/random';
	$response = @file_get_contents( $api_url );
	$error    = error_get_last();

	if ( $error ) {
		echo 'no quotes available at the moment';
	} else {
		$quotes_output = json_decode( $response, true );

		if ( isset( $quotes_output['content'], $quotes_output['author'] ) ) {
			return $quotes_output['content'] . '<br>' . $quotes_output['author'];
		} else {
			echo 'no quotes available at the moment';
		}
	}
}
$display_quote = get_random_quotes();
?>

<strong>  <?php echo $display_quote; ?> </strong>