PHP中通过post请求上传文件

 PHP中通过post请求上传文件的方法：

 

function send_file($url, $post = '', $file = '') {
	$eol = "\r\n";
	$mime_boundary = md5 ( time () );
	$data = '';
	$confirmation = '';
	
	date_default_timezone_set ( "Asia/Shanghai" );
	$time = date ( "Y-m-d H:i:s " );
	$post ["filename"] = $file [filename];
	
	foreach ( $post as $key => $value ) {
		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; ';
		$data .= "name=" . $key . $eol . $eol;
		$data .= $value . $eol;
	}

	$data .= '--' . $mime_boundary . $eol;
	$data .= 'Content-Disposition: form-data; name=' . $file [name] . '; filename=' . $file [filename] . $eol;
	$data .= 'Content-Type: text/plain' . $eol;
	$data .= 'Content-Transfer-Encoding: binary' . $eol . $eol;
	$data .= $file [filedata] . $eol;
	$data .= "--" . $mime_boundary . "--" . $eol . $eol;
	
	$params = array ('http' => array ('method' => 'POST', 'header' => 'Content-Type: multipart/form-data;boundary=' . $mime_boundary . $eol, 'content' => $data ) );
	$ctx = stream_context_create ( $params );
	$response = file_get_contents ( $url, FILE_TEXT, $ctx );
	return $response;
}