upload file via curl [closed]

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I try to upload file via curl in php, this is my sample code

set_time_limit(0);
$url = 'http://localhost/curltest/upload.php';
$field_name = 'file'; 
if (isset($_FILES['file']))
{
$ch = curl_init($url);
curl_setopt($ch,CURLOPT_POSTFIELDS,array("$field_name"=>"@".$_FILES['file']['tmp_name']));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($ch);
curl_close($ch);
echo $result;
}

I set permission to 777,but i开发者_Python百科t doesn't work. where is the problem? (it doesn't show any result)

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I think there is a problem here : $_FILES['file'['tmp_name'] it should be $_FILES['file']['tmp_name'] or something like this. You forget to close the ['file' bracket