执行
<html>
<head></head>
<body>
<form enctype="multipart/form-data" action="high.php" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
Choose an image to upload:<br /><br />
<input name="uploaded" type="file" /><br/>
<br />
<input type="submit" name="upload" value="upload" />
</form>
</body>
</html>
low
<?php
if(isset($_POST['upload'])){
$target_path = "./";
$target_path .= basename($_FILES['uploaded']['name']);
echo $target_path."<br>";
if(!move_uploaded_file($_FILES['uploaded']['tmp_name'],$target_path)){
echo "上传失败";
}else{
echo "{$target_path}上传成功";
}
}
?>
medium
<?php
if(isset($_POST['upload'])){
$target_path = "./";
$target_path .= basename($_FILES['uploaded']['name']);
$uploaded_name = $_FILES['uploaded']['name'];
$uploaded_type = $_FILES['uploaded']['type'];
if(($uploaded_type == "image/jpeg") || ($uploaded_type == "image/png")){
if(!move_uploaded_file($_FILES['uploaded']['tmp_name'],$target_path)){
echo "上传失败";
}else{
echo "{$target_path}上传成功";
}
}else{
echo '<pre>Your image was not uploaded. We can only accept JPEG or PNG images.</pre>';
}
}
?>
high
<?php
if(isset($_POST['upload'])){
$target_path = "./";
$target_path .= basename($_FILES['uploaded']['name']);
$uploaded_name = $_FILES['uploaded']['name'];
$uploaded_ext = substr($uploaded_name,strrpos($uploaded_name,'.')+1);
echo $uploaded_ext;
$uploaded_type = $_FILES['uploaded']['type'];
$uploaded_tmp = $_FILES['uploaded']['tmp_name'];
if((strtolower($uploaded_ext) == "jpg" || strtolower($uploaded_ext) == "jpeg" || strtolower($uploaded_ext) == "png") && getimagesize($uploaded_tmp) ){
if(($uploaded_type == "image/jpeg") || ($uploaded_type == "image/png")){
if(!move_uploaded_file($_FILES['uploaded']['tmp_name'],$target_path)){
echo "上传失败";
}else{
echo "{$target_path}上传成功";
}
}else{
echo '<pre>Your image was not uploaded. We can only accept JPEG or PNG images.</pre>';
}
}else{
echo '<pre>Your image was not uploaded. We can only accept JPEG or PNG images.</pre>';
}
}
?>
PHP知识点
basename() 函数返回路径中的文件名部分。
move_uploaded_file() 函数将上传的文件移动到新位置。若成功，则返回 true，否则返回 false。
语法
move_uploaded_file(file,newloc)
参数 描述
file 必需。规定要移动的文件。
newloc 必需。规定文件的新位置。
PHP Filesystem 函数 $file https://www.cnblogs.com/laijinquan/p/8682282.html
PHP substr()
PHP strrpos() 查找 "php" 在字符串中最后一次出现的位置：
定义和用法
strrpos() 查找字符串在另一字符串中最后一次出现的位置。strrpos() 对大小写敏感。
PHP strtolower() 把所有字符转换为小写：
PHP uniqid() 基于以微秒计的当前时间，生成一个唯一的 ID。