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php后缀名判断和随机命名实例详解

时间：2021-07-01 10:21:17 帮助过：18人阅读

具体请看下文代码示例

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

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>

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