how post a file via curl function in php?

i want to write a script which post a form automatically. it is not a spammer! there is a picture field in form. i want to write the script with php and using curl() function. how can i implement file uploading? and is the php suitable for this purpose? i mean 开发者_JAVA技巧form posting?

To upload a file that's on your server, yes, curl can do the trick.

You'll want to use the CURLOPT_POSTFIELDS option, passing it to the curl_setopt function (quoting) :

The full data to post in a HTTP "POST" operation.
To post a file, prepend a filename with @ and use the full path.

Not tested, but I suppose that something like this should work :

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.yoursite.com/destination-of-upload.php");
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setpopt($ch, CURLOPT_POSTFIELDS, array(
        'file' => '@/..../some-file.txt',    // you'll need to adapt this
        // some other fields ?
));
$result = curl_exec($ch);
curl_close($ch);