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PHP socket simulation POST request example_PHP tutorial
- WBOYOriginal
- 2016-07-13 10:44:491067browse
The most commonly used simulated POST requests are almost all implemented using php curl. We did not consider that PHP socket can also be implemented. Today I saw a friend wrote an article. Let me share with you how to simulate PHP socket Request instance.
In the past, I used PHP curl extension to simulate post requests. I never thought that PHP socket could also be implemented. I recently looked through the relevant information and found that it is not that profound. It is just that I have never fully understood the principle and essence of post. In fact, it is to send a protocol string marked as post to the destination program as follows:
POST/destination program url HTTP/1.1
Accept: Receive information format
Referer: url origin
Accept-Language: Accept language
Content-Type: application/x-www-form-urlencoded
Cookie: Website cookie, I don’t need to explain too much, right?
User-Agent: User agent, operating system and version, CPU type, browser and version and other information
Host: The host address to send to
Content-Length: The length of the sent data
Pragma: Whether there is a local cache
Cache-Control: Do you need web page caching
Connection: connection status
username=fengdingbo&password=bKjia.c0m //Post sent data
I think everyone should be most familiar with the post method of the form to submit data. For example, when we want to send the username and password to a certain page, fill in the corresponding input box, click the submit button, and finally submit the form What is sent to the action program is the above data. Knowing this, I think it won’t be difficult
At this time, we only need to use the PHP socket to open a port, such as port 80, and use this port to send the above information to the target program.
How do we establish a socket channel on a port?
It's so easy in PHP!
Official prototype:
resource fsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] )
The following is human understanding:
fsockopen (host name, port number, error number & variable, error prompt & variable, timeout)
The host name is the destination you need to send data to;
The port number is the port on which the destination program will wait for your data;
The & variable of the error number, this is the error number returned if the socket establishment is unsuccessful;
The & variable of the error message is the error message returned when an error occurs;
The timeout time is the maximum time to wait if the other party does not respond to the message after posting the data.
If nothing unexpected happens (you set the parameters of the fsockopen() function correctly), a socket channel has now been opened. The next step we need to do is to send the post request protocol to the destination program through this opened channel. , at this time, you can use either fwrite or fputs function to send the post request format to the resource handle opened by fsockopen(). At this time, a great socket simulated post request is born.
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Actually, when the socket channel is opened, if the COOKIE we pass is correct, (the php code running in the screenshot is from above. My user name appears on the web page returned after running, indicating that the other website has acknowledged that I have logged in. ) we can do many things, such as posting posts, replying, etc. You know, right?
Okay, if the above is not convincing enough, let’s look at a php socket to implement image uploading
There are two points to note about this code
First, it is an http post request;
The second is the form upload agreement,
The request string underis suitable for any language.
The code is as follows
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$remote_server = "bKjia.c0m";
$boundary = "---------------------".substr(md5(rand(0,32000)),0,10);
// Build the header
$header = "POST /api.php?action=twupload HTTP/1.0rn";
$header .= "Host: {$remote_server}rn";
$header .= "Content-type: multipart/form-data, boundary=$boundaryrn";
/*
// attach post vars
foreach($_POST AS $index => $value){
$data .="--$boundaryrn";
$data .= "Content-Disposition: form-data; name="".$index.""rn";
$data .= "rn".$value."rn";
$data .="--$boundaryrn";
}
*/
$file_name = "aaa.jpg";
$content_type = "image/jpg";
$data = '';
// and attach the file
$data .= "--$boundaryrn";
$content_file = file_get_contents('aaa.jpg');
$data .="Content-Disposition: form-data; name="userfile"; filename="$file_name"rn";
$data .= "Content-Type: $content_typernrn";
$data .= "".$content_file."rn";
$data .="--$boundary--rn";
$header .= "Content-length: " . strlen($data) . "rnrn";
// Open the connection
$fp = fsockopen($remote_server, 80);
// then just
fputs($fp, $header.$data);
// reader
While (!feof($fp)) {
echo fgets($fp, 128);
}
fclose($fp);