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  <portType name="HelloPort">
    <operation name="doHello">
	  <input message="tns:doHello" />
	  <output message="tns:doHelloResponse" />
	</operation>
  </portType>

To look relationship with messages, see below:

a port type element contains any number of child operation elements. An operation element exists for each operation that will exposed by web services named through its name attribute. The value of the name of attribute is the name of the corresponding PHP function.

At the client side, the name attribute is the name of the function you will be calling.

Next, we will talk about Binding.