检查xml是否存在(simplexml_load_file)

$xml_file = 'example.xml';
$xml = simplexml_load_file($xml_file);

$xml_file = 'example.xml';
$xml = simplexml_load_file($xml_file);
if ($xml === false) {
    echo 'Error: ' . error_get_last()['message'];
    exit;
}

$xml_file = 'example.xml';
$xml = simplexml_load_file($xml_file);
foreach ($xml->children() as $child) {
    echo $child->getName() . ' = ' . $child . "\n";
}