php 标签带特殊符号的xml转json

Question

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
            <soapenv:Header/>
            <soapenv:Body>
                <p237:getNewSampleSerialNumsOutput xmlns:p237="http://www.cat.com/sos/2008/07/15/EquipmentService/">
                    <Equipment>
                        <p463:serialNumber xmlns:p463="http://www.cat.com/dds/Equipment/2008/07/15">JEE10732</p463:serialNumber>
                        <p463:make xsi:nil="true" xmlns:p463="http://www.cat.com/dds/Equipment/2008/07/15"/>
                    </Equipment>
                    <Equipment>
                        <p463:serialNumber xmlns:p463="http://www.cat.com/dds/Equipment/2008/07/15">LBX10017</p463:serialNumber>
                        <p463:make xsi:nil="true" xmlns:p463="http://www.cat.com/dds/Equipment/2008/07/15"/>
                    </Equipment>
                    <Equipment>
                        <p463:serialNumber xmlns:p463="http://www.cat.com/dds/Equipment/2008/07/15">ZAE10029</p463:serialNumber>
                        <p463:make xsi:nil="true" xmlns:p463="http://www.cat.com/dds/Equipment/2008/07/15"/>
                    </Equipment>
                </p237:getNewSampleSerialNumsOutput>
            </soapenv:Body>
        </soapenv:Envelope>

获取的xml如上，按照正常的simplexml_load_string方法因为标签有特殊符号:导致无法返回空。
但是我将标签和属性上的：去掉后就能正常获取值。
所以想问一下如何将标签和属性名的特殊符号过滤掉或者有什么方法可以直接转成json格式

谢谢

Answer 1

$doc = new DOMDocument(); 
可以用这个