php上传功能集后缀名判断和随机命名

form.php

<html>

<head>

    <meta http-equiv="content-type" content="text/html" charset="utf-8">

    <title>Upload Image</title>

</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 "<a href='javascript:history.go(-1)'>Back</a>";

    }

}

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<$length;$i++){

        $n = rand(0, 35); #strlen($captchaSource));

        if($n >= 36){

            $n = 36 + ceil(($n-36)/3) * 3;

            $captchaResult .= substr($captchaSource, $n, 3);

        }else{

            $captchaResult .= substr($captchaSource, $n, 1);

        }

    }

    return $captchaResult;

}

?>

将三个文件整合成一个：

<?php

// 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<$length;$i++){

        $n = rand(0, 35); #strlen($captchaSource));

        if($n >= 36){

            $n = 36 + ceil(($n-36)/3) * 3;

            $captchaResult .= substr($captchaSource, $n, 3);

        }else{

            $captchaResult .= substr($captchaSource, $n, 1);

        }

    }

    return $captchaResult;

}

$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 "<a href='javascript:history.go(-1)'>Back</a>";

    }

}

?>

<html>

<head>

    <meta http-equiv="content-type" content="text/html" charset="utf-8">

    <title>Upload Image</title>

</head>

<body>

<form method="post" action="" 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>