Building XML Web Services with PHP NuSOAP - Walkthrough Example 2 (Page 4 of 5 ) Create a Web Service that will provide a list of all ATM machines for a given zip code and develop a web site with PHP that consumes this service. Upon providing a ZIP code, user can get a list of ATM services (Figure 3). 
Figure 3You can find a Web Service named GeoCash, which provide similar services. You may use this service for development purpose for 60 days with a trial key, for trial key check here. Let’s walk through an example, which consumes (client.php) this service. Step 1: Check WSDL file (if any) for this service. Prepare a request for the service with ZIP code, i.e., make a SOAP envelope (use PHP NuSOAP) Step 2: Get the response (XML document) and parse it with XML parser PHP EXPAT. Step 3: Display data (Figure 3) Listing: Client.php <html>
<head>
<title> AtM INFO</title>
<body>
<?
$xml_file = ‘az.xml’;
require(‘nusoap.php’);
// Prepare SOAP envelop requesting the service
$wsdlfile="http://ws2.serviceobjects.net/gc/GeoCash.asmx?WSDL";
$msg='<GetATMLocations xmlns="http://www.serviceobjects.com/"><PostalCode>20191</PostalCode>
<LicenseKey>WS2-BPN4-AFV4</LicenseKey></GetATMLocations>';
$s=new soapclient($wsdlfile,'wsdl');
// Invoking operation
$s->call('GetATMLocations',array($msg));
// Get the response
$theXML= $s->response;
// To see the response, uncomment the following lines
//echo ‘<xmp>’.$theXML.’</xmp>’;
echo "<table border=5 cellpadding=5>"; echo "<tr><th colspan=2>ATM Info</th></tr>";
// write this response to a file for future pursing
$fp = fopen ($xml_file, "w");
fwrite($fp, $theXML);
fclose($fp);
//Delete 1st 8 Lines which is not a part of XML file
$filename = $xml_file;
$fd = fopen ($filename, "r");
$query_str="HTTP/1.1 200 OK";
$m_line=7;$tmp_line=0;$line=0;
$m_filename = "result2.txt";
$m_fd = fopen($m_filename, "w");
while (!feof ($fd))
{
$buffer = fgets($fd, 4096);
$pos = strpos ($buffer, $query_str);
if ($pos === false and $line==0)
{
fputs ($m_fd,$buffer);
}
else
{
if ($tmp_line < $m_line)
{
$tmp_line = $tmp_line + 1;
$line = 1;
}
else
{
$line = 0;
}
}
}
fclose($fd);
fclose($m_fd);
copy("result2.txt","result.txt");
$xml_file=$m_filename;
//create xml parser object
$parser = xml_parser_create();
/* Define what to do when the parser encounters a start or end tag. Note that “startElement” and “endElement” are user-defined functions, which we will look at in a minute. You can name them whatever you want, but these names are the standard convention. */
xml_set_element_handler($parser,"startElement","endElement"); xml_set_character_data_handler($parser, "characterData");
if (!($filehandler = fopen($xml_file, "r"))) {
die("could not open XML input");
}
/* We start reading the contents of the file, 4K at a time, and put it in the variable “$data” until we reach the end of the file. We use xml_parse to parse each chunk as we go. */
while ($data = fread($filehandler, 4096)) {
if (!xml_parse($parser, $data, feof($filehandler))) {
die(sprintf("XML error:%s at line %d",
xml_error_string(xml_get_error_code($parser)),
xml_get_current_line_number($parser)));
}
}
fclose($filehandler); xml_parser_free($parser);
echo "</table>";
?>
</font>
</body>
</html>
<?php
// Functions
// When the parser encounters the start element of a tag
function startElement($parser_instance, $element_name, $attrs)
{
switch($element_name) {
case "BANK" : echo "<tr><td><b><font face=verdana size=2 color=blue>";
break;
case "ADDRESS" : echo "<b>";
break;
case "LOCATION" : echo "<b>";
break;
case "CITY" : echo "<b>";
break;
case "STATE" : echo "<b>";
break;
case "LATITUDE" : echo "<b>";
break;
case "LONGITUDE" :echo "<b>";
break;
case "NOTES" : echo "<b>";
break;
}
}
// When the parser encounters the data within the start and end tag
function characterData($parser_instance, $xml_data) {
echo $xml_data;
}
// When the parser encounters the end element of a tag
function endElement($parser_instance, $element_name) {
switch($element_name) {
case "BANK" : echo ", </font>";
break;
case "ADDRESS" : echo ", </b>";
break;
case "LOCATION" : echo ", </b>";
break;
case "CITY" : echo ", </b>";
break;
case "STATE" : echo " </b>";
break;
case "LATITUDE" : echo ", </b>";
break;
case "LONGITUDE" : echo ", </b>";
break;
case "NOTES" : echo " </b><tr><td><b>";
break;
}
}
?>Next: Conclusion >>
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