PHP解析SOAP XML响应：获取pinBlocked标签的值

```php
$xml = new SimpleXMLElement($result);
```

其中，`$result`变量存储了包含SOAP XML响应的字符串。

```php
$xml->registerXPathNamespace('a', 'http://theapi.com');
```

这里，我们使用前缀`a`来代表`http://theapi.com`命名空间。你可以选择任何你喜欢的合法前缀。

```php
$item = $xml->xpath('//a:pinBlocked');
```

该XPath表达式`//a:pinBlocked`表示查找所有命名空间为`http://theapi.com`（前缀为`a`）的`pinBlocked`元素。

```php
echo (string)$item[0];
```

注意，这里我们将结果强制转换为字符串类型。

<?php

$result = '<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Body>
    <ReadCardStatusResponse xmlns="http://theapi.com">
      <result>1</result>
      <errorMessage>ok</errorMessage>
      <status>
        <terminalID>123456789</terminalID>
        <profileNumber>123456789</profileNumber>
        <reference>37292141</reference>
        <valid>true</valid>
        <pinBlocked>true</pinBlocked>
        <activated>true</activated>
        <retired>false</retired>
        <loaded>true</loaded>
        <redeemed>true</redeemed>
        <empty>true</empty>
        <cancelled>false</cancelled>
        <stopped>true</stopped>
        <lost>false</lost>
        <stolen>false</stolen>
        <expired>false</expired>
        <transactionID>blahblah</transactionID>
        <transactionDate>2004-10-28T08:54:27</transactionDate>
        <checksum>blahblah</checksum>
        <resultCode>1</resultCode>
        <resultText>ok</resultText>
      </status>
    </ReadCardStatusResponse>
  </soap:Body>
</soap:Envelope>';

$xml = new SimpleXMLElement($result);
$xml->registerXPathNamespace('a', 'http://theapi.com');
$item = $xml->xpath('//a:pinBlocked');

echo (string)$item[0]; // 输出: true

?>