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);
    }
}

在PHP中删除文件夹中的所有文件的简单和最好的方法

$files = glob('my_folder/*'); //get all file names
foreach($files as $file){
    if(is_file($file))
    unlink($file); //delete file
}

从这里得到这个源代码- http://www.codexworld.com/delete-all-files-from-folder-using-php/

 <?
//delete all files from folder  & sub folders
function listFolderFiles($dir)
{
    $ffs = scandir($dir);
    echo '<ol>';
    foreach ($ffs as $ff) {
        if ($ff != '.' && $ff != '..') {
            if (file_exists("$dir/$ff")) {
                unlink("$dir/$ff");
            }
            echo '<li>' . $ff;
            if (is_dir($dir . '/' . $ff)) {
                listFolderFiles($dir . '/' . $ff);
            }
            echo '</li>';
        }
    }
    echo '</ol>';
}
$arr = array(
    "folder1",
    "folder2"
);
for ($x = 0; $x < count($arr); $x++) {
    $mm = $arr[$x];
    listFolderFiles($mm);
}
//end
?> 

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

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);
    }
}

foreach (new DirectoryIterator('/path/to/directory') as $fileInfo) {
    if(!$fileInfo->isDot()) {
        unlink($fileInfo->getPathname());
    }
}