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Friday, June 5, 2009

PHP call external cgi and process responses

This is tough for me. First time to code in PHP with cgi and don't know how to start. Thanks google for this.

My task is call a cgi script to execute some function and process the return data. Well, here i'll mention on how to call external cgi and the process part can be settled using PHP string processing.

Let's start by example:

cgi domain location:

The code will strip header below and return the content of the response data.

HTTP/1.1 200 OK
Date: Sat, 06 Jun 2009 02:23:33 GMT
Server: Apache
X-returncode: 0
X-returndesc: Access denied
Cache-control: no-cache
Pragma: no-cache
Connection: close
Transfer-Encoding: chunked
Content-Type: text/plain

We can do anything we want to get the information we need in $content.


/* sample for calling cgi */
$host = '';
$path = '/scripts/handler/API.cgi';

$data_to_send = 'action=GetSupportedData';

PostToHost($host, $path, $data_to_send);

/* function that will call cgi */
function PostToHost($host, $path, $data_to_send) {

$header = "not yet";
$content = '';
$fp = fsockopen($host,80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)\n";
else {
fputs($fp, "POST $path HTTP/1.1\n");
fputs($fp, "Host: $host\n");
fputs($fp, "Content-type: application/x-www-form-urlencoded\n");
fputs($fp, "Content-length: ".strlen($data_to_send)."\n");
fputs($fp, "Connection: close\n\n");
fputs($fp, $data_to_send);

while(!feof($fp)) {
//echo fgets($fp, 4000);
$line = fgets( $fp, 4000 );
if( $line == "\r\n" && $header == "not yet" ) {
$header = "passed";
if( $header == "passed" ) {
$content .= $line;
echo $content;

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