PHP file upload (implemented using global array $_FILES)

This article mainly talks about using the global array $_FILES in PHP to implement file upload. It has certain reference value. Interested friends can learn about it.

The PHP global array $_FILES is used here to implement file upload:

• $_FILES["file"]["name"] - Uploaded file The name of
• $_FILES["file"]["type"] - The type of file being uploaded
• $_FILES["file"][" size"] - Size of the file being uploaded, in bytes
• $_FILES["file"]["tmp_name"] - Temporary copy of the file stored on the server Name
• $_FILES["file"]["error"] - Error code caused by file upload

HTML code:

<form action="upload_file.php" method="post" enctype="multipart/form-data">
    <label for="file">Filename:</label>
    <input type="file" name="file" id="file" /><br />
    <input type="submit" name="submit" value="Submit" /></form>

PHP code:

if (!empty($_FILES)) { 
    // 限制文件大小
    $file_size = $_FILES["file"]["size"];    // 限制2M大小
    if ($file_size > 1024 * 1024 * 2) {        echo '文件大小超过限制';        exit;
    } 
    // 限制文件上传类型
    $file_type = $_FILES["file"]["type"];    $file_type_arr = ['image/jpg', 'image/jpeg', 'image/png', 'image/pjpeg', 'image/gif'];    if (!in_array($file_type, $file_type_arr)) {        echo '上传文件类型错误';        exit;
    } 
    // 文件上传到服务器临时文件夹之后的文件名
    $tem_name = $_FILES['file']['tmp_name'];    // 取得文件后缀名
    $file_fix = explode('.', $_FILES['file']['name'])[1] ? explode('.', $_FILES['file']['name'])[1] : 'png';    // 文件重命名，这里自动生成一个不重复的名字，方便使用
    $name = md5(uniqid(md5(microtime(true)), true)) . '.' . $file_fix;    // 要存放文件的目录定义，这里按日期分开存储
    $file_dir = dirname(__FILE__) . '/upload/' . date('Ymd') . '/';    // 检测要存放文件的目录是否存在，不存在则创建
    if (!is_dir($file_dir)) {        mkdir($file_dir, 0755, true);
    }    // 移动文件到指定目录下
    @ move_uploaded_file($tem_name, $file_dir . $name); 
    echo '上传成功';    exit;
} else {    echo '文件上传失败';    exit;
}

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