使用PHP的XML特殊字符

function ords_to_unistr($ords,$encoding = 'UTF-8'){
    // Turns an array of ordinal values into a string of unicode characters
    $str = '';
    for($i = 0; $i < sizeof($ords); $i++){
        // Pack this number into a 4-byte string
        // (Or multiple one-byte strings,depending on context.)               
        $v = $ords[$i];
        $str .= pack("N",$v);
    }
    $str = mb_convert_encoding($str,$encoding,"UCS-4BE");
    return($str);           
}

function unistr_to_ords($str,$encoding = 'UTF-8'){       
    // Turns a string of unicode characters into an array of ordinal values,// Even if some of those characters are multibyte.
    $str = mb_convert_encoding($str,"UCS-4BE",$encoding);
    $ords = array();

    // Visit each unicode character
    for($i = 0; $i < mb_strlen($str,"UCS-4BE"); $i++){       
        // Now we have 4 bytes. Find their total
        // numeric value.
        $s2 = mb_substr($str,$i,1,"UCS-4BE");                   
        $val = unpack("N",$s2);           
        $ords[] = $val[1];               
    }       
    return($ords);
}

这里不需要编码这些字符. XML字符串可以使用UTF-8或其他编码.根据编码,序列化器将根据需要进行编码.

$foo = new SimpleXmlElement('<?xml version="1.0" encoding="UTF-8"?><foo/>');
$foo->addChild('bar','μmol/l,x10³ cells/µl'); 
echo $foo->asXml();

输出(未编码的特殊字符)：

<?xml version="1.0" encoding="UTF-8"?>
<foo><bar>μmol/l,x10³ cells/µl</bar></foo>

要强制实体使用特殊字符,您需要更改编码：

$foo = new SimpleXmlElement('<?xml version="1.0" encoding="ASCII"?><foo/>');
$foo->addChild('bar',x10³ cells/µl');
echo $foo->asXml();

输出(特殊字符编码)：

<?xml version="1.0" encoding="ASCII"?>
<foo><bar>&#956;mol/l,x10&#179; cells/&#181;l</bar></foo>

我建议你将自定义编码转换回UTF-8.这样,XML Api可以处理它.如果您想使用自定义编码存储字符串,则需要在a bug左右工作.

类似&#120&#49&#48&#60&#115&#117的字符串会触发SimpleXML / DOM中的错误. SimpleXMLElement :: addChild()和DOMDocument :: createElement()的第二个参数有一个断开的转义.您需要将内容创建为文本节点并附加它.

这是一个扩展SimpleXMLElement的小类,并添加了一个解决方法：

class MySimpleXMLElement extends SimpleXMLElement {

  public function addChild($nodeName,$content = NULL) {
    $child = parent::addChild($nodeName);
    if (isset($content)) {
      $node = dom_import_simplexml($child);
      $node->appendChild($node->ownerDocument->createTextNode($content));
    }
    return $child;
  }
}

$foo = new MySimpleXmlElement('<?xml version="1.0" encoding="UTF-8"?><foo/>');
$foo->addChild('bar','&#120&#49&#48&#60&#115&#117'); 
echo $foo->asXml();

输出：

<?xml version="1.0" encoding="UTF-8"?>
<foo><bar>&amp;#120&amp;#49&amp;#48&amp;#60&amp;#115&amp;#117</bar></foo>

&来自您的自定义编码作为实体& amp; – 因为它是XML中的特殊字符. XML解析器将对其进行解码.

$xml = <<<'XML'
<?xml version="1.0" encoding="UTF-8"?>
<foo><bar>&amp;#120&amp;#49&amp;#48&amp;#60&amp;#115&amp;#117</bar></foo>
XML;

$foo = new SimpleXMLElement($xml);
var_dump((string)$foo->bar);

输出：

string(27) "&#120&#49&#48&#60&#115&#117"