php上传功能集后缀名判断和随机命名(强力推荐)

5年以前 | 阅读数：899 次 | 编程语言：PHP

不废话了，具体请看下文代码示例讲解。

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>

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。