php实例四之文件的上传

<form method = "post" action = "upload.php" enctype="multipart/form-data">;
<input type = "hidden" name = "MAX_FILE_SIZE" value ="10000000">
需求上传：<input type = "file" name = "myfile" >;
<p> <input type = "submit" name = "submit" value = "确定上传"></p>;
</form>;

<?php
$allowtype = array("gif","png","jpg","doc","txt");     //上传图片的格式
$size = 10000000;                         //允许最大上传是10M
$path = "./uploads";                     //上传后的路径

//判断是否成功的上传了服务器，0表示上传成功
if($_FILES['myfile']['error'] > 0)
{
echo '上传错误：';
switch($_FILES['myfile']['error']){
case 1: die('上传大小超过了限定值：upload_max_filesize');
case 2: die('上传大小超过了表单中的约定值：MAX_FILE_SIZE');
case 3: die('文件只有部分上传！');
case 4: die('没有上传任何文件！');
default：die('未知错误');
}
}
$linshi =explode(".",$_FILES['myfile']['name']);
//判断上传的文件是否符合允许的格式
$hz = array_pop($linshi);//数组获取文件的名称包括扩展名
//方法是判断后缀
if(!in_array($hz,$allowtype))
{
die("这个后缀<b>{$hz}</b>不是允许的文件类型");
}

//判断大小是否符合
if($_FILES['myfile']['size']>$size)
{
die('超过了允许的<b>{$size}</b>字节大小');

}
//$filename = date("YmdHis").rand(100,999).".".$hz;

if(is_uploaded_file($_FILES['myfile']['tmp_name']))
{
if(!move_uploaded_file($_FILES['myfile']['tmp_name'],$path.'/'.$_FILES['myfile']['name']))
{
die('不能将文件移至指定目录！');
}

}else
{
die('不是指定文件！');
}

echo"<center>";
echo "您好!</br>";
echo "您的文件:{$_FILES['myfile']['name']}已上传成功！大小为{$_FILES['myfile']['size']}字节！";
echo"我们会及时处理并联系您,请您耐心等待。";
echo "</br>";
echo "<a href = 'index.php'>返回首页</a>";

echo "</center>";

?>