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1. 单文件上传

<?php
// 可以将判断的信息异常捕获放入try...catch...模块中
echo '<pre>'.print_r($_FILES,true).'</pre>';
// 1. 自定义上传异常类（继承系统的Exception）
class UploadException extends Exception
{
    public function __toString()
    {
        // 将捕获的异常信息放入表格中
        return <<< ERROR
            <table>
                <tr>
                    <td>异常编号</td>
                    <td>异常信息</td>
                    <td>异常文件</td>
                    <td>异常行数</td>
                </tr>
                <tr>
                    <td>$this->code</td>
                    <td>$this->message</td>
                    <td>$this->file</td>
                    <td>$this->line</td>
                </tr>
            </table>
            <style>
                table{border-collapse: collapse;border: 1px solid black;text-align: center;}
                td{padding: 8px;border: 1px solid black;}
                tr:first-of-type{background-color: gray;color: white;}
                tr:last-of-type{color: red;}
            </style>
        ERROR;
    }
}
try {
    // 2. 判断错误代码值，抛出相应的异常信息
    $errorCode = $_FILES['file_name']['error'] ?? null;
    if ($errorCode > UPLOAD_ERR_OK) {
        switch ($errorCode) {
            case  UPLOAD_ERR_INI_SIZE :
                throw new UploadException('文件超过`php.ini`中`upload_max_filesize`值',1);
            break;
            case UPLOAD_ERR_FORM_SIZE :
                throw new UploadException('文件大小超过表单中`MAX_FILE_SIZE`指定的值',2);
            break;
            case UPLOAD_ERR_PARTIAL :
                throw new UploadException('文件只有部分被上传',3);
            break;
            case UPLOAD_ERR_NO_FILE :
                throw new UploadException('没有文件被上传',4);
            break;
            case UPLOAD_ERR_NO_TMP_DIR :
                throw new UploadException('找不到临时文件夹',6);
            break;
            default:
            throw new UploadException("未知错误，上传失败", 7);
        }
    }
    // 3. 判断临时文件上传方式是否正确，抛出相应异常信息
    $tempFileName = $_FILES['file_name']['tmp_name'] ?? null;
    // 如果不是POST方式上传，抛出异常
    if($_POST['btn'] === 1){
        if (!($tempFileName && is_uploaded_file($tempFileName))){
            throw new UploadException('上传方式有误',8);
        }
    } 
    // 如果上传方式正确，将临时文件储存到uploads目录下
    if ($tempFileName && is_uploaded_file($tempFileName)){
        $originalFileName = $_FILES['file_name']['name'] ?? null;
        $destination = 'uploads/'.md5(time()).mt_rand(1,10000).strstr($originalFileName,".");
        if(move_uploaded_file($tempFileName,$destination)){
            echo "<br>临时文件储存在： ".$tempFileName;
            echo "<br>现在文件被移动到： ".$destination;
            echo "<br>文件上传成功";
            echo "<br><img src='{$destination}' width='180'>";
        }
    }
    // 4. 判断文件类型是否正确，抛出相应异常信息
    $fileType = $_FILES['file_name']['type'] ?? null;
    $endType = strstr($fileType,"/",true);
    if (!is_null($fileType)){
        if($endType !== "image")
        throw new UploadException('上传文件格式错误，请上传image类型的图片',9);                   
    }
} catch (UploadException $e) {
    echo $e;
}
?>
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>文件上传异常处理</title>
  </head>
  <body>
    <form action="" method="POST" enctype="multipart/form-data">
      <fieldset>
        <legend>单文件上传</legend>
        <!-- 设置前端上传文件的大小 -->
        <input type="hidden" name="MAX_FILE_SIZE" value="380000">
        <input type="file" name="file_name"  /> 
        <button name="btn" value="1">上传</button>
      </fieldset>
    </form>
  </body>
</html>

2. 多文件上传方式一：使用多个<input>

<?php
error_reporting(E_ALL);
echo '<pre>'.print_r($_FILES,true).'</pre>';
// 1. 自定义异常
class UploadException extends Exception
{
    public function __toString()
    {
        // 将捕获的异常信息放入表格中
        return <<< ERROR
            <table>
                <tr>
                    <td>异常编号</td>
                    <td>异常信息</td>
                    <td>异常文件</td>
                    <td>异常行数</td>
                </tr>
                <tr>
                    <td>$this->code</td>
                    <td>$this->message</td>
                    <td>$this->file</td>
                    <td>$this->line</td>
                </tr>
            </table>
            <style>
                table{border-collapse: collapse;border: 1px solid black;text-align: center;}
                td{padding: 8px;border: 1px solid black;}
                tr:first-of-type{background-color: gray;color: white;}
                tr:last-of-type{color: red;}
            </style>
        ERROR;
    }
}
try {
    // 多文件上传时，先遍历$_FILES
    foreach($_FILES as $file){
        // 2. 判断错误代码值，抛出相应的异常信息
        $errorCode = $file['error'] ?? null;
        if ($errorCode > UPLOAD_ERR_OK) {
            switch ($errorCode) {
                case  UPLOAD_ERR_INI_SIZE :
                    throw new UploadException('文件超过`php.ini`中`upload_max_filesize`值',1);
                break;
                case UPLOAD_ERR_FORM_SIZE :
                    throw new UploadException('文件大小超过表单中`MAX_FILE_SIZE`指定的值',2);
                break;
                case UPLOAD_ERR_PARTIAL :
                    throw new UploadException('文件只有部分被上传',3);
                break;
                case UPLOAD_ERR_NO_FILE :
                    throw new UploadException('没有文件被上传',4);
                break;
                case UPLOAD_ERR_NO_TMP_DIR :
                    throw new UploadException('找不到临时文件夹',6);
                break;
                default:
                throw new UploadException("未知错误，上传失败", 7);
            }
        }
        // 3. 判断临时文件上传方式是否正确，抛出相应异常信息
        $tmpFileName = $file['tmp_name'] ?? null;
        // 如果不是POST方式上传，抛出异常
        if($_POST['btn'] === 1){
            if (!($tmpFileName && is_uploaded_file($tmpFileName))){
                throw new UploadException('上传方式有误',8);
            }
        } 
        // 如果上传方式正确，将临时文件储存到uploads目录下
        if ($tmpFileName && is_uploaded_file($tmpFileName)){
            $originalFileName = $file['name'] ?? null;
            $destination = 'uploads/'.md5(time()).mt_rand(1,10000).strstr($originalFileName,".");
            if(move_uploaded_file($tmpFileName,$destination)){
                echo "<img src='{$destination}' width='180'>";
                echo "<span style='color:red;font-size:1.5rem;'>{$originalFileName} 上传成功 </span><hr>";
            }
        }
         // 4. 判断文件类型是否正确，抛出相应异常信息
        $fileType = $file['type'] ?? null;
        $endType = strstr($fileType,"/",true);
        if (!is_null($fileType)){
            if($endType !== "image")
            throw new UploadException('上传文件格式错误，请上传image类型的图片',9);                   
        }
    }
} catch (UploadException $e) {
    echo $e;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>多文件上传</title>
</head>
<body>
    <form action="" method="POST" enctype="multipart/form-data">
        <fieldset>
            <legend>批量上传文件</legend>
            <!-- 隐藏域设置上传文件大小,必须写到input:file之前 -->
            <!-- <input type="hidden" name="MAX_FILE_SIZE" value="55000"> -->
            <input type="file" name="file1" > <br>
            <input type="file" name="file2" > <br>
            <input type="file" name="file3" >
            <button name="btn" value="1">上传</button>
        </fieldset>
    </form>
</body>
</html>

3. 多文件上传方式二：只有一个<input>

upload.php:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>多文件上传批量处理</title>
  </head>
  <body>
    <form action="check.php" method="POST" enctype="multipart/form-data">
      <fieldset>
        <legend>多文件上传</legend>
        <!-- 设置前端上传文件的大小 -->
        <!-- <input type="hidden" name="MAX_FILE_SIZE" value="380000"> -->
        <input type="file" name="file[]" multiple /> 
        <button name="btn" value="1">上传</button>
      </fieldset>
    </form>
  </body>
</html>

check.php:

<?php
// 可以将判断的信息异常捕获放入try...catch...模块中
// 测试数据显示的代码，根据测试才有了以下的写法
// echo '<pre>'.print_r($_FILES['file'],true).'</pre>';
// print_r($_FILES['file']['name']);
// print_r($_FILES['file']['type']);
// print_r($names)
// echo $names[0];
// print_r( $types);
// 将三维数组全部转为一维数组，将$_FILES的键值直接保存下来，后期直接遍历相应的数组就可以取出值来
$names = $_FILES['file']['name'];
$types = $_FILES['file']['type'];
$tmp_names = $_FILES['file']['tmp_name'];
$errors = $_FILES['file']['error'];
$sizes = $_FILES['file']['size'];
// 1. 自定义上传异常类（继承系统的Exception）
class UploadException extends Exception
{
    public function __toString()
    {
        // 将捕获的异常信息放入表格中
        return <<< ERROR
            <table>
                <tr>
                    <td>异常编号</td>
                    <td>异常信息</td>
                    <td>异常文件</td>
                    <td>异常行数</td>
                </tr>
                <tr>
                    <td>$this->code</td>
                    <td>$this->message</td>
                    <td>$this->file</td>
                    <td>$this->line</td>
                </tr>
            </table>
            <style>
                table{border-collapse: collapse;border: 1px solid black;text-align: center;}
                td{padding: 8px;border: 1px solid black;}
                tr:first-of-type{background-color: gray;color: white;}
                tr:last-of-type{color: red;}
            </style>
        ERROR;
    }
}
try {
    // 2. 判断错误代码值，抛出相应的异常信息
    foreach($errors as $errorCode){
        if ($errorCode > UPLOAD_ERR_OK) {
            switch ($errorCode) {
                case  UPLOAD_ERR_INI_SIZE :
                    throw new UploadException('文件超过`php.ini`中`upload_max_filesize`值',1);
                break;
                case UPLOAD_ERR_FORM_SIZE :
                    throw new UploadException('文件大小超过表单中`MAX_FILE_SIZE`指定的值',2);
                break;
                case UPLOAD_ERR_PARTIAL :
                    throw new UploadException('文件只有部分被上传',3);
                break;
                case UPLOAD_ERR_NO_FILE :
                    throw new UploadException('没有文件被上传',4);
                break;
                case UPLOAD_ERR_NO_TMP_DIR :
                    throw new UploadException('找不到临时文件夹',6);
                break;
                default:
                throw new UploadException("未知错误，上传失败", 7);
            }
        }
    }
    // 3. 判断临时文件上传方式是否正确，抛出相应异常信息
    foreach($tmp_names as $index => $tmpFileName){
        // 如果不是POST方式上传，抛出异常
        if($_POST['btn'] === 1){
            if (!($tmpFileName && is_uploaded_file($tmpFileName))){
                throw new UploadException('上传方式有误',8);
            }
        } 
        // 如果上传方式正确，将临时文件储存到uploads目录下
        // 上面遍历的临时文件名中$index的作用就在这里，根据$tmp_names[$index]就可以取到$names[$index]
        // 因为它们的键名都是相对应的，所以可以通过$index拿到文件名的后缀
        if ($tmpFileName && is_uploaded_file($tmpFileName)){   
          $destination = 'uploads/'.md5(time()).mt_rand(1,10000).strstr($names[$index],".");
          if(move_uploaded_file($tmpFileName,$destination)){
              echo "<img src='{$destination}' width='180'>";
              echo "<span style='color:red;font-size:1.5rem;'> {$names[$index]}上传成功 </span><hr>";     
          }
        }
    }
    // 4. 判断文件类型是否正确，抛出相应异常信息
    foreach($types as $filetype){
      $endType = strstr($fileType,"/",true);
      if (!is_null($fileType)){
          if($endType !== "image")
          throw new UploadException('上传文件格式错误，请上传image类型的图片',9);                   
      }
    }
  } catch (UploadException $e) {
        echo $e;
}
?>

4. 封装一个类，支持单元件与多文件上传

index.php:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>多文件上传批量处理</title>
  </head>
  <body>
    <form action="check.php" method="POST" enctype="multipart/form-data">
      <fieldset>
        <legend>多文件上传</legend>
        <!-- 设置前端上传文件的大小 -->
        <!-- <input type="hidden" name="MAX_FILE_SIZE" value="380000"> -->
        <input type="file" name="file[]" multiple /> 
        <button name="btn" value="1">上传</button>
      </fieldset>
    </form>
  </body>
</html>

UploadFile.php:

<?php
// 1. 自定义上传异常类（继承系统的Exception）
class UploadException extends Exception
{
    public function __toString()
    {
        // 将捕获的异常信息放入表格中
        return <<< ERROR
            <table>
                <tr>
                    <td>异常编号</td>
                    <td>异常信息</td>
                    <td>异常文件</td>
                    <td>异常行数</td>
                </tr>
                <tr>
                    <td>$this->code</td>
                    <td>$this->message</td>
                    <td>$this->file</td>
                    <td>$this->line</td>
                </tr>
            </table>
            <style>
                table{border-collapse: collapse;border: 1px solid black;text-align: center;}
                td{padding: 8px;border: 1px solid black;}
                tr:first-of-type{background-color: gray;color: white;}
                tr:last-of-type{color: red;}
            </style>
        ERROR;
    }
}
class UploadFile extends UploadException
{
    public $names;
    public $types; 
    public $tmp_names; 
    public $errors; 
    public $sizes;
    public function __construct($types,$tmp_names,$errors,$names,$sizes)
    {
        $this->names = $names;
        $this->types = $types;
        $this->tmp_names = $tmp_names;
        $this->errors = $errors;
        $this->sizes = $sizes;
        return $this->check();
    }
    public function check (){
        try {
            // 2. 判断错误代码值，抛出相应的异常信息
            foreach($this->errors as $errorCode){
                if ($errorCode > UPLOAD_ERR_OK) {
                    switch ($errorCode) {
                        case  UPLOAD_ERR_INI_SIZE :
                            throw new UploadException('文件超过`php.ini`中`upload_max_filesize`值',1);
                        break;
                        case UPLOAD_ERR_FORM_SIZE :
                            throw new UploadException('文件大小超过表单中`MAX_FILE_SIZE`指定的值',2);
                        break;
                        case UPLOAD_ERR_PARTIAL :
                            throw new UploadException('文件只有部分被上传',3);
                        break;
                        case UPLOAD_ERR_NO_FILE :
                            throw new UploadException('没有文件被上传',4);
                        break;
                        case UPLOAD_ERR_NO_TMP_DIR :
                            throw new UploadException('找不到临时文件夹',6);
                        break;
                        default:
                        throw new UploadException("未知错误，上传失败", 7);
                    }
                }
            }
            // 3. 判断临时文件上传方式是否正确，抛出相应异常信息
            foreach($this->tmp_names as $index => $tmpFileName){
                // 如果不是POST方式上传，抛出异常
                if($_POST['btn'] === 1){
                    if (!($tmpFileName && is_uploaded_file($tmpFileName))){
                        throw new UploadException('上传方式有误',8);
                    }
                } 
                // 如果上传方式正确，将临时文件储存到uploads目录下
                // 上面遍历的临时文件名中$index的作用就在这里，根据$tmp_names[$index]就可以取到$names[$index]
                // 因为它们的键名都是相对应的，所以可以通过$index拿到文件名的后缀
                if ($tmpFileName && is_uploaded_file($tmpFileName)){   
                  $destination = 'uploads/'.md5(time()).mt_rand(1,10000).strstr($this->names[$index],".");
                  if(move_uploaded_file($tmpFileName,$destination)){
                      echo "<img src='{$destination}' width='180'>";
                      echo "<span style='color:red;font-size:1.5rem;'> {$names[$index]}上传成功 </span><hr>";     
                  }
                }
            }
            // 4. 判断文件类型是否正确，抛出相应异常信息
            foreach($this->types as $filetype){
              $endType = strstr($fileType,"/",true);
              if (!is_null($fileType)){
                  if($endType !== "image")
                  throw new UploadException('上传文件格式错误，请上传image类型的图片',9);                   
              }
            }
          } catch (UploadException $e) {
                echo $e;
        }
    }
}
?>

check.php:

<?php
    spl_autoload_register('meth');
    function meth ($class){
        $file = __DIR__.'/'.$class.'.php';
        require_once $file;
    }
    $types = $_FILES['file']['type'] ?? null;
    $tmp_names = $_FILES['file']['tmp_name'] ?? null;
    $errors = $_FILES['file']['error'] ?? null;
    $sizes = $_FILES['file']['size'] ?? null;
    $names = $_FILES['file']['name'] ?? null;
    $obj = new UploadFile($types,$tmp_names,$errors,$names,$sizes);
?>