php上传功能集后缀名判断和随机命名，php上传后缀命名

php上传功能集后缀名判断和随机命名，php上传后缀命名

form.php

html>
head>
    meta http-equiv="content-type" content="text/html" charset="utf-8">
    title>Upload Imagetitle>
head>
body>
form method="post" action="upload.php" enctype="multipart/form-data">
    input type="hidden" name="MAX_FILE_SEZE" value="2000000">
    input type="file" name="file" value="view">
    input type="submit" value="upload" name="B1">
form>
body>
html>

upload.php

php
include("check.php"); // 引入自定义函数文件
$type = array("jpg", "gif", "bmp", "jpeg", "png");
// 判断上传文件类型
$fileext = strtolower(fileext($_FILES['file']['name']));
$uploadfilename = random(8);
if(in_array($fileext, $type)){
    $filename = explode(".", $_FILES['file']['name']);

        if(is_uploaded_file($_FILES['file']['tmp_name'])){
//        echo $_FILES['file']['tmp_name'];
        $flag = move_uploaded_file($_FILES['file']['tmp_name'], "/Library/WebServer/Documents/test/".$uploadfilename.".".$fileext);
        if($flag){
            echo "上传成功！";
        }else{
            echo "Error.";
        }
        echo "Back";
    }
}

check.php

php
header("Content-type:text/html;charset=utf8");
// 获取文件后缀名函数
function fileext($filename){
    $sTemp = strrchr($filename, ".");
    return substr($sTemp, 1);
}
function fileext2($filename){
    $sTemp = explode(".", $filename);
    return $sTemp[count($sTemp)-1];

}
// 生成随机文件名函数
function random($length){
    $captchaSource = "0123456789abcdefghijklmnopqrstuvwxyz这是一个随机打印输出字符串的例子";

    $captchaResult = "2015"; // 随机数返回值
    $captchaSentry = ""; // 随机数中间变量
    for($i=0;$i$length