了解CURLOPT_POSTFIELDS

Question

你好，任何人都可以帮助我理解这一行的含义

curl_setopt($ch, CURLOPT_POSTFIELDS, array("binFile" => "@".realpath($myf)));

其中

$myf = 'test.txt';

这条线取自：

 $ch = curl_init(); 
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_USERAGENT, $agent);
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS,array("binFile"=>"@".realpath($myf)));
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
 curl_setopt($ch, CURLOPT_REFERER, $reffer);
 curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_file_path); 
 curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file_path); 
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
 $result = curl_exec($ch);
 curl_close($ch);