$dir = 'your/directory/';
foreach(glob($dir.'*.*') as $v){
    unlink($v);
}

对我来说，使用readdir的解决方案是最好的，而且非常有效。对于glob，该函数在某些情况下会失败。

// Remove a directory recursively
function removeDirectory($dirPath) {
    if (! is_dir($dirPath)) {
        return false;
    }

    if (substr($dirPath, strlen($dirPath) - 1, 1) != '/') {
        $dirPath .= '/';
    }

    if ($handle = opendir($dirPath)) {

        while (false !== ($sub = readdir($handle))) {
            if ($sub != "." && $sub != ".." && $sub != "Thumb.db") {
                $file = $dirPath . $sub;

                if (is_dir($file)) {
                    removeDirectory($file);
                } else {
                    unlink($file);
                }
            }
        }

        closedir($handle);
    }

    rmdir($dirPath);
}

以下代码来自http://php.net/unlink:

/**
 * Delete a file or recursively delete a directory
 *
 * @param string $str Path to file or directory
 */
function recursiveDelete($str) {
    if (is_file($str)) {
        return @unlink($str);
    }
    elseif (is_dir($str)) {
        $scan = glob(rtrim($str,'/').'/*');
        foreach($scan as $index=>$path) {
            recursiveDelete($path);
        }
        return @rmdir($str);
    }
}

下面是一种使用标准PHP库(SPL)的更现代的方法。

$dir = "path/to/directory";
if(file_exists($dir)){
    $di = new RecursiveDirectoryIterator($dir, FilesystemIterator::SKIP_DOTS);
    $ri = new RecursiveIteratorIterator($di, RecursiveIteratorIterator::CHILD_FIRST);
    foreach ( $ri as $file ) {
        $file->isDir() ?  rmdir($file) : unlink($file);
    }
}

$dir = 'your/directory/';
foreach(glob($dir.'*.*') as $v){
    unlink($v);
}

另一个解决方案: 该类删除所有文件、子目录和子目录中的文件。

class Your_Class_Name {
    /**
     * @see http://php.net/manual/de/function.array-map.php
     * @see http://www.php.net/manual/en/function.rmdir.php 
     * @see http://www.php.net/manual/en/function.glob.php
     * @see http://php.net/manual/de/function.unlink.php
     * @param string $path
     */
    public function delete($path) {
        if (is_dir($path)) {
            array_map(function($value) {
                $this->delete($value);
                rmdir($value);
            },glob($path . '/*', GLOB_ONLYDIR));
            array_map('unlink', glob($path."/*"));
        }
    }
}