转载

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>