php上传功能集后缀名判断和随机命名(强力推荐)

更新时间：2026-08-08 17:50:39作者：yezheng

不废话了，具体请看下文代码示例讲解。

form.php

<html>

<head>

<title>Upload Image</title>

</head>

<body>

</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>

<title>Upload Image</title>

</head>

<body>

</form>

</body>

</html>

以上内容就是给大家讲解的php上传功能集后缀名判断和随机命名(强力推荐)，希望大家喜欢。