Description:
------------
Hi,

when parsing a wsdl file with _duplicate_ functions defined by <operation name..>, PHP SOAP parser stops with following error message:

"Parsing WSDL: <functionname> already defined"

The Problem is - duplicate functions are used with function overloading - and o.k. for the Java SOAP interface..

Other way, by automated file generation the following code would produce duplicate function definitions in wsdl, one with 1, second with 2 Params:

  function foofunction($a, $optional_b = null)


I append a bit of wsdl-code which dousn't work as expected as an example;
in php_sdl.c I found some lines where most probably the error message is generated, and zend_hash_add(..) fails.

Greetings,
Michael

Reproduce code:
---------------
// wdsl example - Problem:

[snip]

<message name="foofunction">
<part name="a" type="xsd:int"/>
<part name="optional_b" type="xsd:int"/>
</message>

<message name="foofunction">
<part name="a" type="xsd:int"/>
</message>

operation name="foofunction">
<input message="tns:foofunctionRequest"/>
<output message="tns:foofunctionResponse"/>
</operation>

[snip]




// extract from Source php_sdl.c

static void load_wsdl_ex(zval *this_ptr, char *struri, sdlCtx *ctx, int include TSRMLS_DC)
{
[snip]
} else if (node_is_equal(trav,"message")) {
	xmlAttrPtr name = get_attribute(trav->properties, "name");
	if (name && name->children && name->children->content) {
		if (zend_hash_add(&ctx->messages, (char*)name->children->content, xmlStrlen(name->children->content)+1,&trav, sizeof(xmlNodePtr), NULL) != SUCCESS) {
		soap_error1(E_ERROR, "Parsing WSDL: <message> '%s' already defined", name->children->content);
[snip]


Actual result:
--------------
Parsing WSDL: <functionname> already defined