<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"); // 引入自定義函數(shù)文件
$type = array("jpg", "gif", "bmp", "jpeg", "png");
// 判斷上傳文件類(lèi)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 "上傳成功！";
    }else{
      echo "Error.";
    }
    echo "<a href='javascript:history.go(-1)'>Back</a>";
  }
}

check.php

<?php
header("Content-type:text/html;charset=utf8");
// 獲取文件后綴名函數(shù)
function fileext($filename){
  $sTemp = strrchr($filename, ".");
  return substr($sTemp, 1);
}
function fileext2($filename){
  $sTemp = explode(".", $filename);
  return $sTemp[count($sTemp)-1];
}
// 生成隨機(jī)文件名函數(shù)
function random($length){
  $captchaSource = "0123456789abcdefghijklmnopqrstuvwxyz這是一個(gè)隨機(jī)打印輸出字符串的例子";
  $captchaResult = "2015"; // 隨機(jī)數(shù)返回值
  $captchaSentry = ""; // 隨機(jī)數(shù)中間變量
  for($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;
}
?>

將三個(gè)文件整合成一個(gè)：

<?php
// 獲取文件后綴名函數(shù)
function fileext($filename){
  $sTemp = strrchr($filename, ".");
  return substr($sTemp, 1);
}
function fileext2($filename){
  $sTemp = explode(".", $filename);
  return $sTemp[count($sTemp)-1];
}
// 生成隨機(jī)文件名函數(shù)
function random($length){
  $captchaSource = "0123456789abcdefghijklmnopqrstuvwxyz這是一個(gè)隨機(jī)打印輸出字符串的例子";
  $captchaResult = "2015"; // 隨機(jī)數(shù)返回值
  $captchaSentry = ""; // 隨機(jī)數(shù)中間變量
  for($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");
// 判斷上傳文件類(lèi)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 "上傳成功！";
    }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>

以上內(nèi)容就是給大家講解的php上傳功能集后綴名判斷和隨機(jī)命名(強(qiáng)力推薦)，希望大家喜歡。

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