Falsches Parsen, wenn eine nicht eingerückte XML-Zeichenfolge bereitgestellt wird

Question

Ich versuche, das XML zu analysieren, indem ich den Wert der Knoten und ihrer Attribute in einem assoziativen Array abrufe. In der folgenden Klasse ist convert_simple_xml_element_object_into_array vorgesehen, um den Job zu erledigen.

Aber es passiert etwas Besonderes. Wenn die angegebene Eingabe ein ordnungsgemäß eingerücktes xml ist, ist das zurückgegebene assoziative Array korrekt. Wenn jedoch eine nicht eingerückte xml-Zeichenfolge übergeben wird, wird ein falsches assoziatives Array mit leeren Indizes zurückgegeben. Was könnte der Grund dafür sein?

Probe xml string:

<?xml version="1.0"?> 
<StreamWebInfo><UserInfo Username="a@b.com" AccountId="19"/><JobInfo Id="594" QualifiedFilePath="https://s.com/main_DIS_23009_1_v_2_1c2_2011_08_30.mpd" ParentContainerType="0" ContainerType="10" EndTime="2016-10-05 11:45:09"/><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="320" Height="240" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="320" Height="240" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="320" Height="240" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="480" Height="368" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="480" Height="368" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="480" Height="368" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="480" Height="368" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="480" Height="368" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="864" Height="480" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="864" Height="480" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1280" Height="720" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1280" Height="720" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1280" Height="720" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1280" Height="720" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1920" Height="1088" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1920" Height="1088" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1920" Height="1088" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1920" Height="1088" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1920" Height="1088" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo><ProfileInfo><VideoTrackWebInfo CodecType="3" Width="1920" Height="1088" Bitrate="0" TrackDurationInMin="199" FeaturesUsed="0"/></ProfileInfo></StreamWebInfo> 

Klasse, die das Verfahren aufweist:

<?php 

class _xml_parser { 

    const EMPTY_STRING = ''; 
    const MAX_RECURSION_DEPTH_ALLOWED = 200; 
    const SIMPLE_XML_ELEMENT_OBJECT_PROPERTY_FOR_ATTRIBUTES = '@attributes'; 


    /** 
    * Get the SimpleXMLElement representation of the function input 
    * parameter that contains XML string. Convert the XML string 
    * contents to SimpleXMLElement type. SimpleXMLElement type is 
    * nothing but an object that can be processed with normal property 
    * selectors and (associative) array iterators. 
    * 
    * @param string $xmlStringContents 
    * @return SimpleXMLElement get_simple_xml_element returns a SimpleXMLElement object which 
    * contains an instance variable which itself is an associative array of 
    * several SimpleXMLElement objects. 
    * 
    * 
    * @version 1.0.0 
    */ 
    public static function get_simple_xml_element($xmlStringContents) { 
     $simpleXmlElementObject = self::EMPTY_STRING; 
     if('string' == gettype($xmlStringContents)) { 
      $simpleXmlElementObject = simplexml_load_string($xmlStringContents); 
     } 
     return $simpleXmlElementObject; 
    } 

    /** 
    * This function accepts a SimpleXmlElementObject as a single argument and 
    * converts the XML object into a PHP associative array. 
    * If the input XML is in tree (i.e. nested) format, this function will return an associative 
    * array (tree/nested) representation of that XML. 
    * 
    * Note: It is a recursive a function 
    * 
    * @param string $simpleXmlElementObject 
    * @param number $recursionDepth 
    * 
    * @return If everything is successful, it returns an associate array containing 
    * the data collected from the XML format. Otherwise, it returns null. 
    * 
    * 
    */ 
    public static function convert_simple_xml_element_object_into_array($simpleXmlElementObject, &$recursionDepth=0) { 
     // Keep an eye on how deeply we are involved in recursion. 
     if ($recursionDepth > self::MAX_RECURSION_DEPTH_ALLOWED) { 
      // Fatal error. Exit now. 
      return(null); 
     } 

     if ($recursionDepth == 0) { 
      if (!($simpleXmlElementObject instanceof SimpleXMLElement)) { 
       // If the external caller doesn't call this function initially 
       // with a SimpleXMLElement object, return now. 
       return(null); 
      } else { 
       // Store the original SimpleXmlElementObject sent by the caller. 
       // We will need it at the very end when we return from here. 
       $callerProvidedSimpleXmlElementObject = $simpleXmlElementObject; 
      } 
     } 

     if ($simpleXmlElementObject instanceof SimpleXMLElement) { 
      // Get a copy of the simpleXmlElementObject 
      $copyOfsimpleXmlElementObject = $simpleXmlElementObject; 
      // Get the object variables in the SimpleXmlElement object for us to iterate. 
      $simpleXmlElementObject = get_object_vars($simpleXmlElementObject); 
     } 

     // It needs to be an array of object variables. 
     if (is_array($simpleXmlElementObject)) { 
      // Initialize the result array. 
      $resultArray = array(); 
      // Is the input array size 0? Then, we reached the rare CDATA text if any. 
      if (count($simpleXmlElementObject) <= 0) { 
       // Let us return the lonely CDATA. It could even be whitespaces. 
       return (trim(strval($copyOfsimpleXmlElementObject))); 
      } 

      // Let us walk through the child elements now. 
      foreach($simpleXmlElementObject as $key=>$value) { 
       // Uncomment the following block of code if XML attributes are 
       // NOT required to be returned as part of the result array. 
       /* 
       if((is_string($key)) && ($key == self::SIMPLE_XML_ELEMENT_OBJECT_PROPERTY_FOR_ATTRIBUTES)) { 
        continue; 
       } 
       */ 
       // Let us recursively process the current element we just visited. 
       // Increase the recursion depth by one. 
       $recursionDepth++; 
       $resultArray[$key] = self::convert_simple_xml_element_object_into_array($value, $recursionDepth); 
       // Decrease the recursion depth by one. 
       $recursionDepth--; 
      } 

      if ($recursionDepth == 0) { 
       // That is it. Heading to the exit now. 
       // Set the XML root element name as the root [top-level] key of 
       // the associative array that we are going to return to the caller of this 
       // recursive function. 
       $tempArray = $resultArray; 
       $resultArray = array(); 
       $resultArray[$callerProvidedSimpleXmlElementObject->getName()] = $tempArray; 
      } 

      return ($resultArray); 
     } else { 
      // We are now looking at either the XML attribute text or 
      // the text between the XML tags. 
      return (trim(strval($simpleXmlElementObject))); 
     } // End of else 
    } 

    /** 
    * Converts XML to JSON 
    * @param SimpleXMLElement $simpleXmlElementObject 
    * @return JSON string 
    * 
    */ 
    public static function xml2json($simpleXmlElementObject) { 
     $json_from_xml = null; 
     if($simpleXmlElementObject instanceof SimpleXMLElement) { 
      $xml_map = self::convert_simple_xml_element_object_into_array($simpleXmlElementObject); 
      $json_from_xml = json_encode($xmlMap); 
     } 
     return $json_from_xml; 
    } 

} 

In der obigen xml kehrte das Array ein Schlüssel ProfileInfo benannt hat, aber es enthält eine Karte, die ein leeres hat Schlüsselwertpaar.

Answer 1

In der convert_simple_xml_element_object_into_array Funktion müssen Sie überprüfen, ob ein SimpleXMLElement Objekt, das keine Attribute hat Kinder haben. Wenn ja, müssen Sie für jedes Kind erneut die convert_simple_xml_element_object_into_array rekursiv aufrufen.

mit dem neuen den alten Code austauschen sollte eine korrekte Array zurück:

OLD Code:

// Is the input array size 0? Then, we reached the rare CDATA text if any. 
if (count($simpleXmlElementObject) <= 0) { 
    // Let us return the lonely CDATA. It could even be whitespaces. 
    return (trim(strval($copyOfsimpleXmlElementObject))); 
} 

NEW Code:

// Is the input array size 0? Then, we reached the rare CDATA text if any. 
if (count($simpleXmlElementObject) <= 0) { 
    //Check if the Object have children. If so, call again the function 
    if(($copyOfsimpleXmlElementObject instanceof SimpleXMLElement) && (count($copyOfsimpleXmlElementObject->children()) >=1)) { 
    foreach($copyOfsimpleXmlElementObject->children() as $child){ 
     $recursionDepth++; 
     $resultArray[$child->getName()] = self::convert_simple_xml_element_object_into_array($child, $recursionDepth); 
     $recursionDetph--; 
    }      
    } 
    else{ 
    // Let us return the lonely CDATA. It could even be whitespaces. 
    return (trim(strval($copyOfsimpleXmlElementObject))); 
    } 
}