Если мы хотим записать xml-строку в логи с помощью пакета monolog, то строка запишется в одну строку с пробелами между xml-узлов.

Пример:

$xmlString = <<<EOF
<?xml version="1.0"?>
<catalog>
   <book id="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <genre>Computer</genre>
      <price>44.95</price>
      <publish_date>2000-10-01</publish_date>
      <description>An in-depth look at creating applications with XML.</description>
   </book>
   <book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.</description>
   </book>
</catalog>
EOF;
;
 
 
$xml = simplexml_load_string($xmlString);
 
dlog(
    sprintf('xml response: "%s"', trim($xml->asXML()))
);

В логах будет запись:

[2018-02-17 18:26:45] app.DEBUG: xml response: "<?xml version="1.0"?> <catalog>    <book id="bk101">       <author>Gambardella, Matthew</author>       <title>XML Developer's Guide</title>       <genre>Computer</genre>       <price>44.95</price>       <publish_date>2000-10-01</publish_date>       <description>An in-depth look at creating applications with XML.</description>    </book>    <book id="bk102">       <author>Ralls, Kim</author>       <title>Midnight Rain</title>       <genre>Fantasy</genre>       <price>5.95</price>       <publish_date>2000-12-16</publish_date>       <description>A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.</description>    </book> </catalog>" [] []

Запись не выглядит единым целым, что мешает чтению логов (по крайней мере мне).

Желаемого можно достичь с помощью \DOMDocument.

Пример:

$xmlString = <<<EOF
<?xml version="1.0"?>
<catalog>
   <book id="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <genre>Computer</genre>
      <price>44.95</price>
      <publish_date>2000-10-01</publish_date>
      <description>An in-depth look at creating applications
      with XML.</description>
   </book>
   <book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies,
      an evil sorceress, and her own childhood to become queen
      of the world.</description>
   </book>
</catalog>
EOF;
;
 
$xml = simplexml_load_string($xmlString);
 
dlog(
    sprintf('Xml-ответ после закупки товаров из 1С: "%s"', trim(
        call_user_func(
            function (\SimpleXMLElement $xml) {
                $dom = new \DOMDocument('1.0');
                $dom->preserveWhiteSpace = false;
                $dom->loadXML($xml->asXML());
                return $dom->saveXML();
            },
            $xml
        )
    ))
);

В логах уже будет приятная запись:

[2018-02-17 18:26:45] app.DEBUG: xml response: "<?xml version="1.0"?> <catalog><book id="bk101"><author>Gambardella, Matthew</author><title>XML Developer's Guide</title><genre>Computer</genre><price>44.95</price><publish_date>2000-10-01</publish_date><description>An in-depth look at creating applications with XML.</description></book><book id="bk102"><author>Ralls, Kim</author><title>Midnight Rain</title><genre>Fantasy</genre><price>5.95</price><publish_date>2000-12-16</publish_date><description>A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.</description></book></catalog>" [] []

Примечание: в заметке опущена реализация функции dlog() и предполагается, что к вам прилетает xml в виде \SimpleXMLElement.