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Image and file upload using PHP and XML

WBOYOriginal: 2023-08-08 16:16:451203browse

Using PHP and XML to implement image and file upload

Introduction:
With the development of the Internet, image and file upload functions have become common on many websites need. This article will introduce how to use PHP and XML to implement image and file upload functions. Through code examples, we will show how to write a simple upload function and how to use XML to store information about uploaded files.

1. PHP implements image and file upload
PHP provides a wealth of functions to process uploaded files. The following is a simple code example:

<!DOCTYPE html>
<html>
<head>
    <title>上传文件</title>
</head>
<body>
    <form action="upload.php" method="post" enctype="multipart/form-data">
        <label for="file">选择文件：</label>
        <input type="file" name="file" id="file">
        <input type="submit" name="submit" value="上传">
    </form>
</body>
</html>

<?php
if(isset($_POST['submit'])){
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["file"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
    
    // 检查文件类型
    if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
    && $imageFileType != "gif" && $imageFileType != "pdf" && $imageFileType != "docx") {
        echo "只允许上传 JPG, JPEG, PNG, GIF, PDF, DOCX 格式的文件";
        $uploadOk = 0;
    }
    
    // 检查文件大小
    if ($_FILES["file"]["size"] > 500000) {
        echo "文件过大，最大允许上传500KB";
        $uploadOk = 0;
    }
    
    // 如果上述检查都通过了，就开始上传文件
    if ($uploadOk == 0) {
        echo "上传失败";
    } else {
        if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
            echo "文件上传成功";
        } else {
            echo "上传失败";
        }
    }
}
?>

2. XML storage of uploaded file information
XML is a commonly used data storage format. We can save the relevant information of uploaded files in XML format. The following is a simple code example:

<?php
// 保存文件信息到XML
function saveFileInfoToXML($filename, $type, $size){
    $xmlFile = 'files.xml';
    $xml = simplexml_load_file($xmlFile);
    
    // 创建文件元素
    $file = $xml->addChild('file');
    $file->addChild('name', $filename);
    $file->addChild('type', $type);
    $file->addChild('size', $size);
    
    // 保存XML文件
    $xml->asXML($xmlFile);
}

if(isset($_POST['submit'])){
    // 上传文件
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["file"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

    // 省略文件类型和大小检查的代码

    if ($uploadOk == 0) {
        echo "上传失败";
    } else {
        if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
            echo "文件上传成功";
            
            // 保存文件信息到XML
            saveFileInfoToXML($_FILES["file"]["name"], $imageFileType, $_FILES["file"]["size"]);
        } else {
            echo "上传失败";
        }
    }
}
?>

In the above code, we define a saveFileInfoToXML function to create an XML file and save relevant information about the uploaded file. After successfully uploading the file, we call this function to save the name, type and size of the file to the XML file.

Conclusion:
By using PHP and XML, we can easily implement the upload function of images and files, and save the relevant information of the uploaded files in XML format. This feature is very useful for many websites, I hope this article can be helpful to you.

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