Custom rewrite rules for /quote/:ticker/ WordPress route that uses a single custom page template for all tickers

functions.php

function custom_quote_rewrite_rule() {
    add_rewrite_rule(
        '^quote/([^/]+)/?$',
        'index.php?pagename=quote&quote_ticker=$matches[1]',
        'top'
    );
}
add_action('init', 'custom_quote_rewrite_rule');

function custom_quote_query_vars($vars) {
    $vars[] = 'quote_ticker';
    return $vars;
}
add_filter('query_vars', 'custom_quote_query_vars');

function custom_quote_template_include($template) {
    if (get_query_var('quote_ticker') && get_query_var('pagename') === 'quote') {
        $custom_template = locate_template('quote-template.php');
        if ($custom_template) {
            return $custom_template;
        }
    }
    return $template;
}
add_filter('template_include', 'custom_quote_template_include');

quote-template.php

<?php
/* Template Name: Quote Template */
get_header();

$ticker = get_query_var('quote_ticker'); // Get the 'quote_ticker' query variable
?>

<div class="quote-container">
    <h1>Quote Details for: <?php echo esc_html($ticker); ?></h1>
    
    <?php if ($ticker): ?>
        <div class="quote-details">
            <p>Displaying information for ticker: <strong><?php echo esc_html($ticker); ?></strong></p>
            <!-- Add custom logic here, such as fetching API data or database content -->
        </div>
    <?php else: ?>
        <p>No ticker specified. Please provide a valid ticker in the URL.</p>
    <?php endif; ?>
</div>

<?php get_footer(); ?>