SN_SoapClient.class.php

<?php

class SN_SoapClient extends SoapClient
{
 // ...
	protected function fixArgs($function_name, $arguments)
	{
            // get the arguments for the function
	    $parameters = array_flip($this->getFunctionArguments($function_name));

            if ($invalidParameters = array_diff_key($arguments, $parameters)) {
                throw new Exception("Soap function $function_name does not support the following parameters: ". implode(', ', array_keys($invalidParameters)));
            }

            //Use the parameter names as keys
            $orderedArguments = array_merge($parameters, $arguments);
        
            return $orderedArguments;
	}

	protected function getFunctionArguments($function_name)
	{
	    $functions = $this->__getFunctions();
	    $listRegex = '/list\(([^)]+)\) ([^(]+)\(([^)]+)/';
	    $singleRegex = '/([^ ]+) ([^(]+)\(([^)]+)/';

	    foreach ($functions as $function) {
	       $regex = ('list(' === substr($function, 0, 5)) ? $listRegex : $singleRegex;
	       preg_match($regex, $function, $matches);

	       if ($matches[2] === $function_name) {
               $output = explode(', ', $matches[1]); // not being used, but maybe later
               $input  = explode(', ', $matches[3]);
               $orderedParameters = array();

               foreach ($input as $key => $value) {
                   $orderedParameters[] = substr($value, strpos($value, '$') + 1);
               }

               return $orderedParameters;
	       }
	    }

	    throw new Exception("Soap function $function_name does not exist");
	}