PHP file operation tips: various copy methods

PHP is a widely used open source server-side programming language that is ideal for file operations. In PHP, file copying is a relatively common operation. It can not only back up files, but also perform operations such as data transfer and backup.

This article will introduce you to various copy methods in PHP, I hope it will be helpful to you.

1. Copy the entire folder

If you need to copy the entire folder, you can use the following method:

function copyDir($dirFrom, $dirTo) {
    // 检查是否存在目录。
    if(!is_dir($dirTo)) mkdir($dirTo);
    // 打开目录。
    $handle = opendir($dirFrom);
    // 读取目录中的文件。
    while(false !== ($file = readdir($handle))) {
        // 忽略 . 和 .. 文件夹。
        if($file != "." && $file != "..") {
            // 复制文件。
            if(is_file($dirFrom."/".$file)) {
                copy($dirFrom."/".$file, $dirTo."/".$file);
            }
            // 递归复制子目录。
            if(is_dir($dirFrom."/".$file)) {
                copyDir($dirFrom."/".$file, $dirTo."/".$file);
            }
        }
    }
    // 关闭目录。
    closedir($handle);
}

This method will copy the entire folder, including all subdirectories and documents.

2. Copy a single file

If you only need to copy a single file, you can use the following code:

// 复制文件。
$srcFile = "file1.txt";
$destFile = "file2.txt";
if(!copy($srcFile, $destFile)) {
    echo "无法复制 $srcFile...
";
}

3. Copy the relative path

below The code will copy the file using a relative path (for example, if both files are in the same folder):

// 复制文件。
$srcFile = "file1.txt";
$destFile = "file2.txt";
if(!copy("../".$srcFile, "../".$destFile)) {
    echo "无法复制 $srcFile...
";
}

4. Use file stream copy

If you wish to copy the file contents to another In a file, you can use the following code:

// 打开源文件。
$srcFile = fopen("file1.txt", "r");
// 打开目标文件。
$destFile = fopen("file2.txt", "w");
// 从源文件读取，并写入目标文件。
while (($buffer = fgets($srcFile, 4096)) !== false) {
    fwrite($destFile, $buffer);
}
// 关闭文件。
fclose($srcFile);
fclose($destFile);

5. Copy to remote server

The following code will copy the file to the remote server:

// 远程服务器地址。
$remoteServer = "example.com";
// 远程服务器用户名。
$remoteUser = "user";
// 远程服务器密码。
$remotePass = "password";
// 远程服务器文件夹。
$remotePath = "/path/to/remote/folder/";
// 本地文件。
$localFile = "file1.txt";
// 连接到远程服务器。
$conn = ftp_connect($remoteServer);
// 登录到远程服务器。
$login = ftp_login($conn, $remoteUser, $remotePass);
// 上传文件。
if (ftp_put($conn, $remotePath."/".basename($localFile), $localFile, FTP_BINARY)) {
    echo "文件上传成功";
} else {
    echo "文件上传失败";
}
// 关闭FTP连接。
ftp_close($conn);

6. Copy multiple files

If you wish to copy multiple files, you can use the following code:

// 复制多个文件。
$srcFiles = array("file1.txt", "file2.txt", "file3.txt");
$destFolder = "backup/";
// 循环复制文件。
foreach($srcFiles as $file) {
    $destFile = $destFolder.basename($file);
    if(!copy($file, $destFile)) {
        echo "无法复制 $file...
";
    }
}

As mentioned above, here are some common PHP file copy methods. Each method is specific to different situations and I hope this article can help you.

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