php学习笔记：文件的上传（包含设置文件的上传大小限制）

<?<span style="color: #000000;">php
</span><span style="color: #008000;">/*</span><span style="color: #008000;">*
 * Created by PhpStorm.
 * User: Administrator
 * Date: 16-9-12
 * Time: 上午10:01
 *
 * 文件上传
 *
 </span><span style="color: #008000;">*/</span>




?>


    <form action="upload.php" method="post" enctype="multipart/form-data"><span style="color: #000000;">
        上传文件：</span><input type="file" name="file" id="file">
        <br/>
        <input type="submit" name="subbtn" value="上传">
    </form>


<?<span style="color: #000000;">php

</span><span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">isset</span>(<span style="color: #800080;">$_POST</span>['subbtn'<span style="color: #000000;">])){

    </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$_FILES</span>['file']['type']."<br/>"<span style="color: #000000;">;

    </span><span style="color: #008000;">/*</span><span style="color: #008000;">
     * JPG image/jpeg
     * GIF image/gif
     * PNG image/png
     *
     </span><span style="color: #008000;">*/</span>



    <span style="color: #008000;">//</span><span style="color: #008000;">文件上传处理程序：
    //$_FILES['file']['type']  上传文件的类型
    //$_FILES['file']['size']  上传文件的大小

    //$_FILES['file']['error']  上传错误代码
    //$_FILES['file']['name']   上传文件名

    //$_FILES['file']['tmp_name'] 临时文件名
//$fileName="a.TXT";
//$pos = strrpos($fileName,".");
//$ext = strtolower(substr($fileName,$pos));
//</span>

    <span style="color: #800080;">$file</span> = <span style="color: #800080;">$_FILES</span>['file'<span style="color: #000000;">];
    </span><span style="color: #800080;">$fileName</span>=<span style="color: #800080;">$file</span>['name'<span style="color: #000000;">];
    </span><span style="color: #0000ff;">echo</span> '后缀切割前：'.  <span style="color: #800080;">$file</span>['name']."<br/>"<span style="color: #000000;">;
    </span><span style="color: #008000;">//</span><span style="color: #008000;">确定最后一个.出现的位置</span>
    <span style="color: #800080;">$pos</span> = <span style="color: #008080;">strrpos</span>(<span style="color: #800080;">$file</span>['name'],'.'<span style="color: #000000;">);
    </span><span style="color: #008000;">//</span><span style="color: #008000;">转换文件名为小写</span>
    <span style="color: #800080;">$ext</span> = <span style="color: #008080;">strtolower</span>(" <span style="color: #800080;">$fileName</span>"<span style="color: #000000;">);
    </span><span style="color: #008000;">//</span><span style="color: #008000;">提取文件名后缀</span>
    <span style="color: #800080;">$fileExten</span>=<span style="color: #008080;">substr</span>(<span style="color: #800080;">$ext</span>,<span style="color: #800080;">$pos</span>+2<span style="color: #000000;">);

    </span><span style="color: #008000;">//</span><span style="color: #008000;">判断文件后缀时候符合特定要求，这里设置为：jpg jpeg doc</span>
    <span style="color: #0000ff;">if</span>(<span style="color: #800080;">$fileExten</span>=='jpg'||<span style="color: #800080;">$fileExten</span>=='jpeg'||<span style="color: #800080;">$fileExten</span>=='doc'<span style="color: #000000;"> ){

        </span><span style="color: #0000ff;">echo</span> "文件后缀：". <span style="color: #800080;">$fileExten</span>. "<br/>"<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> "文件类型：". <span style="color: #800080;">$file</span>['type']."<br/>"<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> "文件大小：". <span style="color: #800080;">$file</span>['size']."<br/>"<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> "错误代码：". <span style="color: #800080;">$file</span>['error']."<br/>"<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> "文件名:". <span style="color: #800080;">$file</span>['name']."<br/>"<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> "临时文件名:". <span style="color: #800080;">$file</span>['tmp_name']."<br/>"<span style="color: #000000;">;

        </span><span style="color: #008080;">move_uploaded_file</span>(<span style="color: #800080;">$file</span>['tmp_name'], "files/".<span style="color: #800080;">$file</span>['name'<span style="color: #000000;">]);

    }</span><span style="color: #0000ff;">else</span>
        <span style="color: #0000ff;">echo</span> "文件格式不对"<span style="color: #000000;">;
}

</span>?>