<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div class="container">
<form enctype="multipart/form-data" action="upload.php?action=img" method="post" name="imge">
<input value="导入文件" type="file" name="img" id="file" />
<input type="submit" id="imgbut" class="btn" value="上传图片" />
</form>
</div>
</body>
</html>
<?php
header("Content-Type:text/html;charset=utf-8");
if (isset($_GET["action"]) == "img") {
//step 1 使用$_FILES['pic']["error"] 检查错误
if ($_FILES["img"]["error"] > 0) {
switch ($_FILES["img"]["error"]) {
case 1 :
echo "<script type='text/javascript'>alert('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值<br>');history.back();</script>";
break;
case 2 :
echo "<script type='text/javascript'>alert('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值');history.back();</script>";
break;
case 3 :
echo "<script type='text/javascript'>alert('文件只有部分被上传');history.back();</script>";
break;
case 4 :
echo "<script type='text/javascript'>alert('没有文件被上传');history.back();</script>";
break;
default :
echo "<script type='text/javascript'>alert('末知错误');history.back();</script>";
}
exit;
}
$maxsize = 1000000000;
//step 2 使用$_FILES["pic"]["size"] 限制大小 单位字节 2M=2000000
if ($_FILES["img"]["size"] > $maxsize) {
echo "<script type='text/javascript'>alert('上传的文件太大，不能超过{$maxsize}字节');history.back();</script>";
exit;
}
//step 3 使用$_FILES["pic"]["type"]或是文件的扩展名 限制类型 MIME image/gif image/png gif png jpg
$allowtype = array("png", "gif", "jpg", "jpeg");
$arr = explode(".", $_FILES["img"]["name"]);
$hz = $arr[count($arr) - 1];
if (!in_array($hz, $allowtype)) {
echo "<script type='text/javascript'>alert('这是不允许的类型');history.back();</script>";
exit;
}
//step 4 将让传后的文件名改名
$filepath = "uploads/";
//为了符合UBB的路径
$randname = date("Y") . date("m") . date("d") . date("H") . date("i") . date("s") . rand(100, 999) . "." . $hz;
//将临时位置的文件移动到指定的目录上即可
if (is_uploaded_file($_FILES["img"]["tmp_name"])) {
if (move_uploaded_file($_FILES["img"]["tmp_name"], $filepath . $randname)) {
echo "<script type='text/javascript'>alert('上传成功');history.back();</script>";
session_start();
$_SESSION['images'] = $filepath . $randname;
//echo $_SESSION['images'];
} else {
echo "<script type='text/javascript'>alert('上传失败');history.back();</script>";
}
} else {
echo "<script type='text/javascript'>alert('不是一个上传文件');history.back();</script>";
}
}
?>