php学习3----上传原理_php3 上传-优快云博客

(1)，enctype是form表单中的编码格式属性

<form enctype="multipart/form-data" method="post" name="upform">

<input type=”file”>

(2)$_FILES函数

（1） move_uploaded_file()上传后文件移动目标位置

move_uploaded_file(临时文件，目标位置和文件名);

is_uploaded_file()判断文件上传类型是否为http post

3，客户端的限制：

<form action="doaction.php" method="post" enctype="multipart/form-data">
   <input type="hidden" name="MAX_FILE_SIZE" value="512000"><!--限制文件大小-->
   请选择文件：<input type="file" name="file"><!--accept="image/*,text/*,audio/*,vedio/*,application/*"限制文件类型-->
   <input type="submit" value="上传文件">
</form>

上传源码：

 <php>：
       <?php
     $ok=0;
    $_FILES["upfile"]=!empty($_FILES["upfile"])?$_FILES["upfile"]:null;
$_FILES["upfile"]["tmp_name"]=!empty($_FILES["upfile"]["tmp_name"])?$_FILES["upfile"]["tmp_name"]:null;
  if(is_uploaded_file($_FILES["upfile"]["tmp_name"])){
	$upfile=$_FILES["upfile"];
	$name=$upfile["name"];
	$type=$upfile["type"];
	$size=$upfile["size"];
	$tmp_name=$upfile["tmp_name"];
	switch($type){
		case 'image/pjpeg':$ok=1;break;
		case 'image/jpeg':$ok=1;break;
		case 'image/jpg':$ok=1;break;
		case 'image/png':$ok=1;break;
		case 'image/gif':$ok=1;break;
		}
	if($ok){
		move_uploaded_file($tmp_name,'img/'.$name);
		echo "success!!";
		}else{
			echo "TYPE wrong!!";}
 }
?>
<html>;
   <form enctype="multipart/form-data" action=" " method="post" name="jform">
        <input type="file" name="upfile" />
        <input type="submit" name="jsubmit" value="上传头像" /><br />
    </form>