Скачать или смотреть how to make a php soap call using the soapclient class

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Okay, let's dive deep into making PHP SOAP calls using the `SoapClient` class. This tutorial will cover everything from the basics to more advanced scenarios, including handling namespaces, headers, authentication, and errors. I'll provide plenty of code examples along the way.

*What is SOAP?*

SOAP (Simple Object Access Protocol) is an XML-based messaging protocol for exchanging structured information in the implementation of web services in computer networks. It's a standardized way for applications to communicate over the internet. Think of it as a structured way to send requests and receive responses between two applications.

*What is `SoapClient` in PHP?*

The `SoapClient` class in PHP is the workhorse for interacting with SOAP web services. It allows you to:

*Describe the service:* Automatically discover the service's methods, parameters, and return types by reading a WSDL (Web Services Description Language) file.
*Make requests:* Call the service's methods by creating properly formatted SOAP messages.
*Receive responses:* Parse the SOAP responses into PHP data structures.

*Prerequisites:*

*PHP with SOAP extension enabled:* Make sure you have the SOAP extension installed and enabled in your `php.ini` file. You may need to uncomment a line like `extension=soap` or install the extension using your system's package manager (`apt-get install php-soap` on Debian/Ubuntu, `yum install php-soap` on CentOS/RHEL, etc.).

*Basic Example: Calling a Simple SOAP Service*

Let's start with a simple example using a publicly available SOAP service. I'll use the `http://www.dneonline.com/calculator.a...` service, which provides basic calculator functions.



*Explanation:*

1. *`new SoapClient($wsdl)`:* This creates a new `SoapClient` object. The `$wsdl` variable holds the URL of the WSDL file. The WSDL file describes the service, its methods, the parameters they accept, and the data types they return. The `SoapClient` uses ...

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