PHP基础：单文件上传、多文件上传、批量上传

1.单文件上传

// 自定义上传异常类
class UploadException extends Exception
{
    // 在异常子类中,可以访问并重写Exception中的四个属性,通过__toString()格式化异常输出信息
    public function __toString()
    {
        return <<< UPLOAD
<style>
table {border-collapse: collapse;border:1px solid black;text-align: center;}
td {border:1px solid black;padding: 5px;}
tr:first-of-type {background-color:#eee;}
tr:last-of-type td {color: coral;}
</style>
<table>
<tr><td>代码</td><td>信息</td><td>文件</td><td>行号</td></tr>
<tr><td>$this->code</td><td>$this->message</td><td>$this->file</td><td>$this->line</td></tr>
</table>
UPLOAD;
    }
}
///////////////////////////////////////////////////////////////////////
try {
    // 上传出错的代码
    $errorCode = $_FILES['my_pic']['error'];
    if ($errorCode > UPLOAD_ERR_OK) {
        switch ($errorCode) {
            case UPLOAD_ERR_INI_SIZE:
                throw new UploadException('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值', 1);
            break;
            case UPLOAD_ERR_FORM_SIZE:
                throw new UploadException('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值', 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;
            case UPLOAD_ERR_CANT_WRITE:
                throw new UploadException('文件写入失败', 7);
                break;
            default:
                // 测试时建议关掉default: 避免误报影响
                throw new UploadException('未知类型错误', 8);
        }
    }
    // 判断文件类型
    $fileType = $_FILES['my_pic']['type'];
    if (strstr($fileType, '/', true) !== 'image') throw new UploadException('文件类型错误',9);
    // 将文件从临时目录 移动到用户自定义的目标目录中
 // 临时文件名
    $tempFileName = $_FILES['my_pic']['tmp_name'];
    if (is_uploaded_file($tempFileName)) {
        // 原始文件名
        $originalFileName = $_FILES['my_pic']['name'];
        // 目录文件名
       $destFileName =  'uploads/'.md5(time().mt_rand(1,1000)).strstr($originalFileName, '.');
       // 移动文件到目标目录使用的函数
        if (move_uploaded_file($tempFileName, $destFileName)) {
            echo "<p>$originalFileName: 上传成功~~</p>";
            // 预览
            echo "<img src='{$destFileName}' width='200'>";
        }
    }
} catch (UploadException $e) {
    echo $e;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>文件上传变量$_FILES</title>
</head>
<body>
    <hr>
    <form action="" method="POST" enctype="multipart/form-data">
    <fieldset>
        <legend>单文件上传: 异常处理</legend>
        <input type="hidden" name="MAX_FILE_SIZE" value="3000000">
        <input type="file" name="my_pic">
        <button>上传</button>
    </fieldset>
    </form>
</body>
</html>

上传成功运行效果：

上传错误运行效果：

2.多文件上传

<?php
class UploadException extends Exception
{
    // 在异常子类中,可以访问并重写Exception中的四个属性,通过__toString()格式化异常输出信息
    public function __toString()
    {
        return <<< UPLOAD
<style>
table {border-collapse: collapse;border:1px solid black;text-align: center;}
td {border:1px solid black;padding: 5px;}
tr:first-of-type {background-color:#eee;}
tr:last-of-type td {color: coral;}
</style>
<table>
<tr><td>代码</td><td>信息</td><td>文件</td><td>行号</td></tr>
<tr><td>$this->code</td><td>$this->message</td><td>$this->file</td><td>$this->line</td></tr>
</table>
UPLOAD;
    }
}
try {
    foreach ($_FILES as $file) {
    // 上传出错的代码
    $errorCode = $file['error'];
    if ($errorCode > UPLOAD_ERR_OK) {
        switch ($errorCode) {
            case UPLOAD_ERR_INI_SIZE:
                throw new UploadException('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值', 1);
            break;
            case UPLOAD_ERR_FORM_SIZE:
                throw new UploadException('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值', 2);
                break;
            case UPLOAD_ERR_PARTIAL:
                throw new UploadException('文件只有部分被上传', 3);
                break;
            case UPLOAD_ERR_NO_FILE:
                throw new UploadException('没有文件被上传', 4);
                break;
            case UPLOAD_ERR_NO_TMP_DIR:
                throw new UploadException('找不到临时文件夹', 6);
                break;
            case UPLOAD_ERR_CANT_WRITE:
                throw new UploadException('文件写入失败', 7);
                break;
            default:
                // 测试时建议关掉default: 避免误报影响
                throw new UploadException('未知类型错误', 8);
        }
    }
    // 只要判断 error === 0 
    if ($file['error'] === 0) {
        // 判断文件类型
        // print_r($file) ;
    $fileType = $file['type'];
    if (strstr($fileType, '/', true) !== 'image') throw new UploadException('文件类型错误',9);
        $tempFileName = $file['tmp_name'];
    if (is_uploaded_file($tempFileName)) {
        // 原始文件名
        $originalFileName = $file['name'];
        // 目录文件名
       $destFileName =  'uploads/'.md5(time().mt_rand(1,1000)).strstr($originalFileName, '.');
       // 移动文件到目标目录使用的函数
        if (move_uploaded_file($tempFileName, $destFileName)) {
            echo "<p>$originalFileName: 上传成功~~</p>";
            // 预览
            echo "<img src='{$destFileName}' width='200'>";
        }
    }
    }
}
} catch (UploadException $e) {
    echo $e;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>文件上传变量$_FILES</title>
</head>
<body>
    <hr>
    <form action="" method="POST" enctype="multipart/form-data">
    <fieldset>
        <legend>多文件上传: 逐个上传(一)</legend>
        <input type="hidden" name="MAX_FILE_SIZE" value="3000000">
        <input type="file" name="my_pic1">
        <input type="file" name="my_pic2">
        <input type="file" name="my_pic3">
        <button>上传</button>
    </fieldset>
    </form>
</body>
</html>

多文件上传成功运行效果：

多文件上传错误运行效果：

3.多文件批量上传

<?php
class UploadException extends Exception
{
    // 在异常子类中,可以访问并重写Exception中的四个属性,通过__toString()格式化异常输出信息
    public function __toString()
    {
        return <<< UPLOAD
<style>
table {border-collapse: collapse;border:1px solid black;text-align: center;}
td {border:1px solid black;padding: 5px;}
tr:first-of-type {background-color:#eee;}
tr:last-of-type td {color: coral;}
</style>
<table>
<tr><td>代码</td><td>信息</td><td>文件</td><td>行号</td></tr>
<tr><td>$this->code</td><td>$this->message</td><td>$this->file</td><td>$this->line</td></tr>
</table>
UPLOAD;
    }
}
try {
if ($_FILES['my_pic'])
// print_r($_FILES['my_pic']);
foreach ($_FILES['my_pic']['error'] as $key => $error) {
    // 只要判断 error === 0 
    // 上传出错的代码
    $errorCode=$_FILES['my_pic']['error'][$key];
    if ($error === UPLOAD_ERR_OK) {
    // 临时文件名
      $tmpFileName = $_FILES['my_pic']['tmp_name'][$key];
      // 原始文件名
      $originalFileName = $_FILES['my_pic']['name'][$key];
       // 目标文件名
       $destFileName = 'uploads/'. $originalFileName;
       // 移动文件
       move_uploaded_file($tmpFileName, $destFileName);
       // 预览
       echo "<img src='{$destFileName}' width='200'>";
    }else{
        switch ($error) {
            case UPLOAD_ERR_INI_SIZE:
                throw new UploadException('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值', 1);
            break;
            case UPLOAD_ERR_FORM_SIZE:
                throw new UploadException('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值', 2);
                break;
            case UPLOAD_ERR_PARTIAL:
                throw new UploadException('文件只有部分被上传', 3);
                break;
            case UPLOAD_ERR_NO_FILE:
                throw new UploadException('没有文件被上传', 4);
                break;
            case UPLOAD_ERR_NO_TMP_DIR:
                throw new UploadException('找不到临时文件夹', 6);
                break;
            case UPLOAD_ERR_CANT_WRITE:
                throw new UploadException('文件写入失败', 7);
                break;
            default:
                // 测试时建议关掉default: 避免误报影响
                // throw new UploadException('未知类型错误', 8);
        }
    }
    // if ($errorCode > UPLOAD_ERR_OK) {
    //     switch ($errorCode) {
    //         case UPLOAD_ERR_INI_SIZE:
    //             throw new UploadException('上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值', 1);
    //         break;
    //         case UPLOAD_ERR_FORM_SIZE:
    //             throw new UploadException('上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值', 2);
    //             break;
    //         case UPLOAD_ERR_PARTIAL:
    //             throw new UploadException('文件只有部分被上传', 3);
    //             break;
    //         case UPLOAD_ERR_NO_FILE:
    //             throw new UploadException('没有文件被上传', 4);
    //             break;
    //         case UPLOAD_ERR_NO_TMP_DIR:
    //             throw new UploadException('找不到临时文件夹', 6);
    //             break;
    //         case UPLOAD_ERR_CANT_WRITE:
    //             throw new UploadException('文件写入失败', 7);
    //             break;
    //         default:
    //             // 测试时建议关掉default: 避免误报影响
    //             // throw new UploadException('未知类型错误', 8);
    //     }
    // }else{
    // }
    // if ($error === UPLOAD_ERR_OK) {
    //   // 临时文件名
    //   $tmpFileName = $_FILES['my_pic']['tmp_name'][$key];
    //   // 原始文件名
    //   $originalFileName = $_FILES['my_pic']['name'][$key];
    //    // 目标文件名
    //    $destFileName = 'uploads/'. $originalFileName;
    //    // 移动文件
    //    move_uploaded_file($tmpFileName, $destFileName);
    //    // 预览
    //    echo "<img src='{$destFileName}' width='200'>";
    // }
}
} catch (UploadException $e) {
    echo $e;
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>文件上传变量$_FILES</title>
</head>
<body>
    <hr>
    <form action="" method="POST" enctype="multipart/form-data">
    <fieldset>
        <legend>多文件上传: 批量上传</legend>
        <input type="hidden" name="MAX_FILE_SIZE" value="3000000">
        <!-- 将name属性值能数组的形式提供 -->
        <input type="file" name="my_pic[]" multiple>
        <button>上传</button>
    </fieldset>
    </form>
</body>
</html>