Why can't I delete a sentence to upload a file using curl in php?

{Code ...} the code is as above. Why can't post be executed if & amp; lt; inputtype & quot; text & quot; name & quot; fname & quot; & amp; gt; is deleted?

   
  '@'.realpath($path).";filename=".$filename);        $ch = curl_init();        curl_setopt($ch, CURLOPT_URL, $url);        curl_setopt($ch, CURLOPT_POST, true );        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);        curl_setopt($ch, CURLOPT_HEADER, false);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);        $return_data = curl_exec($ch);        curl_close($ch);        $decode = json_decode($return_data);        echo $decode->original_pic;         }    if ($_POST) {        $url = 'https://127.0.0.1/img.php';        $tmpname = $_FILES['fname']['name'];        $tmpfile = $_FILES['fname']['tmp_name'];        upload_file($url,$tmpname,$tmpfile);        exit;    }    echo '';?>

Why do I delete the code above?Cannot execute post?

Reply content:

   
  '@'.realpath($path).";filename=".$filename);        $ch = curl_init();        curl_setopt($ch, CURLOPT_URL, $url);        curl_setopt($ch, CURLOPT_POST, true );        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);        curl_setopt($ch, CURLOPT_HEADER, false);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);        $return_data = curl_exec($ch);        curl_close($ch);        $decode = json_decode($return_data);        echo $decode->original_pic;         }    if ($_POST) {        $url = 'https://127.0.0.1/img.php';        $tmpname = $_FILES['fname']['name'];        $tmpfile = $_FILES['fname']['tmp_name'];        upload_file($url,$tmpname,$tmpfile);        exit;    }    echo '';?>

Why do I delete the code above?Cannot execute post?

Is there any error message! Paste it to see

... There should be an error. is it null to return the result? You can only open a breakpoint to see if there is a problem at that step.

The uploaded file information should be put in $ _ FILES instead of $ _ POST. then, there will be nothing in your post and $ _ POST will be printed in advance.

No documentation found. it's just a test. you can set a name for submit.