Common Usage Scenarios and Tips for is_dir During File Movement

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echo "<h1>Common Usage Scenarios and Tips for is_dir During File Movement</h1>";

echo "<p>In PHP development, file and directory operations are very common tasks, especially file movements (moving or renaming files). During file movement, <code>is_dir

3. Avoid Overwriting Existing Files

If a file with the same name already exists in the target directory, you can use is_dir along with file_exists to check and avoid overwriting:

$destinationDir = 'backup/2025/';
$destination = $destinationDir . basename($source);

if (is_dir($destinationDir)) {
    if (!file_exists($destination)) {
        rename($source, $destination);
    } else {
        echo 'Target file already exists, move failed';
    }
} else {
    echo 'Target directory does not exist';
}

4. Directory Check During Batch File Movement

When moving multiple files, you can check whether each target directory exists before moving the corresponding file:

$files = ['file1.txt', 'file2.txt'];
$baseDir = 'backup/2025/';

foreach ($files as $file) {
    $destinationDir = $baseDir . pathinfo($file, PATHINFO_FILENAME) . '/';
    if (!is_dir($destinationDir)) {
        mkdir($destinationDir, 0777, true);
    }
    rename('uploads/' . $file, $destinationDir . $file);
}

5. Helpful Tips

• Before using is_dir, you can combine it with realpath() to get the absolute path and avoid relative path errors.
• In high-concurrency file movement scenarios, is_dir can be combined with a locking mechanism to prevent directory creation conflicts.
• When moving directories instead of files, is_dir is a necessary step to check the operation object.

In summary, is_dir is an indispensable function in the file movement process. It ensures that the directory exists, prevents operation errors, and, when combined with other functions (like mkdir and file_exists), can create a more robust file movement logic.