functions.php

<?php
declare(strict_types=1);

/**
 * Sanitiza contenido para dispositivos móviles antiguos
 */
function mobile_cleanup(string $input, string $encoding): string {
    $cleaned = strip_tags($input);
    $cleaned = html_entity_decode($cleaned, ENT_QUOTES | ENT_HTML5, $encoding);
    return htmlspecialchars($cleaned, ENT_XML1 | ENT_QUOTES, $encoding);
}

/**
 * Obtiene y parsea un feed XML con manejo robusto de errores
 */
function curl_get_xml(string $url, string $encoding): SimpleXMLElement {
    $ch = curl_init();
    
    $options = [
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_FAILONERROR => true,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_MAXREDIRS => 3,
        CURLOPT_TIMEOUT => 15,
        CURLOPT_SSL_VERIFYPEER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_USERAGENT => 'Mozilla/5.0 (compatible; XMLConverter/2.0)',
        CURLOPT_HTTPHEADER => [
            "Accept-Charset: $encoding",
            "Accept: application/xml, text/xml;q=0.9,*/*;q=0.8"
        ]
    ];

    curl_setopt_array($ch, $options);
    
    $response = curl_exec($ch);
    
    if (curl_errno($ch)) {
        throw new RuntimeException('Error CURL: ' . curl_error($ch));
    }

    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if ($httpCode !== 200) {
        throw new RuntimeException("Error HTTP: $httpCode");
    }

    curl_close($ch);

    libxml_use_internal_errors(true);
    $xml = simplexml_load_string((string)$response);
    
    if ($xml === false) {
        $errors = implode("\n", array_map(
            fn($error) => $error->message,
            libxml_get_errors()
        ));
        libxml_clear_errors();
        throw new RuntimeException("Errores XML:\n$errors");
    }

    return $xml;
}