Solved

How do I call a web service from PHP

Posted on 2010-11-26
12
410 Views
Last Modified: 2012-05-10
My code is below.
I am using Ubunto Desktop and PHP Version 5.3.3-1ubuntu9.1.

Go to:
* http://www.ernstpublishing.com/ErnstCalculator/processxml.asmx in a browser
* Click the "Request" webmethod
* enter:  <Request></Request>
* Click "Invoke"
you will get back a DateTime XML response.

Using my code:
?php
$client = new SoapClient("http://www.ernstpublishing.com/ernstcalculator/processxml.asmx?WSDL", array('trace' => 1));

try{
  $result = $client->Request("<Request></Request>");
  echo "Call Worked";
} catch (Exception $e) {
  echo $e->getMessage();
}

?>

I get:  "Server was unable to process request. ---> Value cannot be null. Parameter name: s"

What do I need to do to in my PHP code be able to have my $result return a DateTime xml response string similar to the DateTime xml response string returned via the browser?
0
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Question by:famoso
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12 Comments
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34219180
The "Invoke" example uses HTTP POST, not SOAP.
0
 

Author Comment

by:famoso
ID: 34219190
It looks like It uses SOAP 1.1, SOAP 1.2 and HTTP POST.

Could I get a PHP code sample of how to accomplish what I need?
Can I use any of the code I have?
0
 

Author Comment

by:famoso
ID: 34219192
I am a PHP novice.
0
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LVL 110

Accepted Solution

by:
Ray Paseur earned 500 total points
ID: 34219205

<?PHP // RAY_temp_processxml.php
error_reporting(E_ALL);

// USAGE EXAMPLE CREATES ASSOCIATIVE ARRAY OF KEY=>VALUE PAIRS
$arg["xmlRequest"] = '<Request></Request>';

// SET THE URL
$url = 'http://www.ernstpublishing.com/ErnstCalculator/processxml.asmx/Request';

// CALL CURL TO POST THE DATA
$htm = curl_post($url, $arg, 3, TRUE);

// SHOW WHAT CAME BACK, IF ANYTHING
if ($htm)
{
	echo "USE BROWSER VIEW SOURCE TO SEE THE DATA<br/>" . PHP_EOL;
	echo $htm;
}
else
{
    echo "NO RESPONSE YET FROM $url -- MAYBE IT IS TOO SLOW OR RUNNING ASYNCHRONOUSLY";
}





// DEMONSTRATE HOW TO USE CURL POST
function curl_post($url, $post_array, $timeout=2, $error_report=FALSE)
{
    // PREPARE THE POST STRING
    $post_string = '';
    foreach ($post_array as $key => $val)
    {
        $post_string .= urlencode($key) . '=' . urlencode($val) . '&';
    }
    $post_string = rtrim($post_string, '&');

    // PREPARE THE CURL CALL
    $curl = curl_init();
    curl_setopt( $curl, CURLOPT_URL,            $url         );
    curl_setopt( $curl, CURLOPT_HEADER,         FALSE        );
    curl_setopt( $curl, CURLOPT_POST,           TRUE         );
    curl_setopt( $curl, CURLOPT_POSTFIELDS,     $post_string );
    curl_setopt( $curl, CURLOPT_TIMEOUT,        $timeout     );
    curl_setopt( $curl, CURLOPT_RETURNTRANSFER, TRUE         );

    // EXECUTE THE CURL CALL
    $htm = curl_exec($curl);
    $err = curl_errno($curl);
    $inf = curl_getinfo($curl);

    // ON FAILURE
    if (!$htm)
    {
        // PROCESS ERRORS HERE
        if ($error_report)
        {
            echo "CURL FAIL: $url TIMEOUT=$timeout, CURL_ERRNO=$err";
            echo "<pre>\n";
            var_dump($inf);
            echo "</pre>\n";
        }
        curl_close($curl);
        return FALSE;
    }

    // ON SUCCESS
    curl_close($curl);
    return $htm;
}

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0
 

Author Comment

by:famoso
ID: 34219241
My apache logs say, "Call to undefined function curl_init()"
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34219270
Looks like you need to install CURL.  
http://us.php.net/manual/en/curl.installation.php

We may be able to do it with fsockopen instead.  I'll see if I have an example.
0
 

Author Comment

by:famoso
ID: 34219277
I've been using apt-get.  Can I install CURL with that or can we get the same results without CURL?
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34219320
Give this a try - it should return the HTTP headers and data.
<?PHP // RAY_temp_processxml.php
error_reporting(E_ALL);

// USAGE EXAMPLE CREATES ASSOCIATIVE ARRAY OF KEY=>VALUE PAIRS
$arg["xmlRequest"] = '<Request></Request>';

// SET THE URL AND REQUEST PATH
$server_url  = 'www.ernstpublishing.com';
$request_uri = '/ErnstCalculator/processxml.asmx/Request';

// CONSTRUCT THE RAW POST STRING
$postdata  = '';
foreach ($arg as $key => $val)
{
    $postdata .= '&' . $key . '=' . urlencode($val);
}
$postdata = ltrim($postdata, '&');

// CONSTRUCT THE HEADERS
$header = '';
$header .= "POST $request_uri HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($postdata) . "\r\n\r\n";

// SHOW WHAT WE ARE GOING TO DO
echo "<pre>";
echo "REQUEST DATA FOLLOWS:";
echo PHP_EOL;
var_dump($server_url);
var_dump($request_uri);
var_dump($postdata);
var_dump($header);


// OPEN THE SOCKET TO THE PAGE
$fp = fsockopen ($server_url, 80, $errno, $errstr, 30);

// TEST FOR VERIFICATION
if (!$fp)
{
	die("HTTP ERROR $server_url $request_uri fsockopen() FAILED ERRNO=$errno ERRSTR=$errstr");
}

// HTTP OPEN - WRITE HEADER AND REQUEST
fputs ($fp, $header . $postdata);

// HTTP OPEN - READ RESPONSE
$reply = '';
while (!feof($fp))
{
	$reply	.= fgets($fp, 1024);
}

// SEE WHAT THE FOREIGN SITE SAID
echo PHP_EOL . "USE VIEW SOURCE";
echo PHP_EOL . $reply;

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0
 

Author Comment

by:famoso
ID: 34219322
I sudo apt-get install php5-curl and  sudo /etc/init.d/apache2 restart and your solution worked.

Thanks.
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34219329
This will retrieve only the data string.  Line 51 discards everything but the last response line.

HTH, ~Ray
<?PHP // RAY_temp_processxml.php
error_reporting(E_ALL);

// USAGE EXAMPLE CREATES ASSOCIATIVE ARRAY OF KEY=>VALUE PAIRS
$arg["xmlRequest"] = '<Request></Request>';

// SET THE URL AND REQUEST PATH
$server_url  = 'www.ernstpublishing.com';
$request_uri = '/ErnstCalculator/processxml.asmx/Request';

// CONSTRUCT THE RAW POST STRING
$postdata  = '';
foreach ($arg as $key => $val)
{
    $postdata .= '&' . $key . '=' . urlencode($val);
}
$postdata = ltrim($postdata, '&');

// CONSTRUCT THE HEADERS
$header = '';
$header .= "POST $request_uri HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($postdata) . "\r\n\r\n";

// SHOW WHAT WE ARE GOING TO DO
echo "<pre>";
echo "REQUEST DATA FOLLOWS:";
echo PHP_EOL;
var_dump($server_url);
var_dump($request_uri);
var_dump($postdata);
var_dump($header);


// OPEN THE SOCKET TO THE PAGE
$fp = fsockopen ($server_url, 80, $errno, $errstr, 30);

// TEST FOR VERIFICATION
if (!$fp)
{
    die("HTTP ERROR $server_url $request_uri fsockopen() FAILED ERRNO=$errno ERRSTR=$errstr");
}

// HTTP OPEN - WRITE HEADER AND REQUEST
fputs ($fp, $header . $postdata);

// HTTP OPEN - READ RESPONSE
$reply = '';
while (!feof($fp))
{
    $reply = fgets($fp, 1024);
}

// SEE WHAT THE FOREIGN SITE SAID
echo PHP_EOL . "USE VIEW SOURCE";
echo PHP_EOL . $reply;

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0
 

Author Closing Comment

by:famoso
ID: 34219481
Thanks
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 34219713
Thanks for the points - it's a really good question! ~Ray
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