Using PHP and SOAP Protocol for Web Service Communication

Web services enable cross‑platform communication, and the SOAP protocol provides an XML‑based method for such interactions.

Using PHP’s built‑in SOAP extension, developers can create a SoapClient object, verify the extension with phpinfo(), and call remote methods.

<?php
$wsdl = "http://example.com/webservice?wsdl"; // WSDL URL
$client = new SoapClient($wsdl);
$param1 = "参数1";
$param2 = "参数2";
try {
    $response = $client->WebServiceMethod($param1, $param2);
    var_dump($response);
} catch (SoapFault $e) {
    echo "出错信息：" . $e->getMessage();
}
?>

The client can also send complex parameters such as associative arrays, and handle the returned results.

<?php
$wsdl = "http://example.com/webservice?wsdl";
$client = new SoapClient($wsdl);
$person = [
    "name" => "张三",
    "age" => 25,
    "address" => "北京市"
];
try {
    $response = $client->WebServiceMethod($person);
    var_dump($response);
} catch (SoapFault $e) {
    echo "出错信息：" . $e->getMessage();
}
?>

For services that require authentication, a SoapHeader containing username and password can be attached to the client.

<?php
$wsdl = "http://example.com/webservice?wsdl";
$client = new SoapClient($wsdl);
$username = "用户名";
$password = "密码";
$auth = "<auth><username>{$username}</username><password>{$password}</password></auth>";
$header = new SoapHeader("http://example.com", "Authentication", $auth);
$client->__setSoapHeaders($header);
try {
    $response = $client->WebServiceMethod();
    var_dump($response);
} catch (SoapFault $e) {
    echo "出错信息：" . $e->getMessage();
}
?>

In summary, implementing SOAP communication with PHP involves creating a client, preparing parameters (including complex structures and authentication headers), invoking service methods, and handling responses and exceptions.