上传文件报错解决办法

<?php<br />if ($_FILES["upload_file"]["error"] > 0)<br />    {<br />    echo "Return Code: " . $_FILES["upload_file"]["error"] . "<br />";<br />    }<br />  else<br />    {<br />    echo "Upload: " . $_FILES["upload_file"]["name"] . "<br />";<br />    echo "Type: " . $_FILES["upload_file"]["type"] . "<br />";<br />    echo "Size: " . ($_FILES["upload_file"]["size"] / 1024/1024) . " MB<br />";<br />    echo "Temp file: " . $_FILES["upload_file"]["tmp_name"] . "<br />";<br /><br />      move_uploaded_file($_FILES["upload_file"]["tmp_name"],<br />      "D:/xampp/htdocs/ca/doc/" . $_FILES["upload_file"]["name"]);<br />      echo "Stored in: " . "D:/xampp/htdocs/ca/doc/" . $_FILES["upload_file"]["name"];<br />    }<br />	$name=$_FILES["upload_file"]["name"];<br />	$size=floor($_FILES["upload_file"]["size"] / 1024/1024 )."MB";<br />	$loc="doc/" . $_FILES["upload_file"]["name"];<br />	echo "<br/>";<br />?>