Essential Books

Deleting files and directories

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Deleting files

The unlink function deletes a single file and returns whether the operation was successful. 

$filename = '/path/to/file.txt';

if (file_exists($filename)) {
    $success = unlink($filename);
    
    if (!$success) {
         throw new Exception("Cannot delete $filename");
    }
}

Deleting directories, with recursive deletion

On the other hand, directories should be deleted with rmdir. However, this function only deletes empty directories. To delete a directory with files, delete the files in the directories first. If the directory contains subdirectories, recursion may be needed.

The following example scans files in a directory, deletes member files/directories recursively, and returns the number of files (not directories) deleted. 

function recurse_delete_dir(string $dir) : int {
    $count = 0;

    // ensure that $dir ends with a slash so that we can concatenate it with the filenames directly
    $dir = rtrim($dir, "/\\") . "/";

    // use dir() to list files
    $list = dir($dir);

    // store the next file name to $file. if $file is false, that's all -- end the loop.
    while(($file = $list->read()) !== false) {
        if($file === "." || $file === "..") continue;
        if(is_file($dir . $file)) {
            unlink($dir . $file);
            $count++;
        } elseif(is_dir($dir . $file)) {
            $count += recurse_delete_dir($dir . $file);
        }
    }

    // finally, safe to delete directory!
    rmdir($dir);

    return $count;
}
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File handling:
* File handling
* Deleting files and directories
* Convenience functions
* Getting file information
* Minimize memory usage when dealing with large files
* Stream-based file IO
* Moving and Copying files and directories
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