如何在PHP中使用RegexIterator？
正则表达式
$directory = new RecursiveDirectoryIterator(__DIR__);
$flattened = new RecursiveIteratorIterator($directory);
// Make sure the path does not contain "/.Trash*" folders and ends eith a .php or .html file
$files = new RegexIterator($flattened, '#^(?:[A-Z]:)?(?:/(?!\.Trash)[^/]+)+/[^/]+\.(?:php|html)$#Di');
foreach($files as $file) {
echo $file . PHP_EOL;
}使用过滤器
基类包含需要与过滤器一起使用的正则表达式。
类将扩展这一类。RecursiveRegexIterator已扩展。
abstract class FilesystemRegexFilter extends RecursiveRegexIterator {
protected $regex;
public function __construct(RecursiveIterator $it, $regex) {
$this->regex = $regex;
parent::__construct($it, $regex);
}
}它们是基本过滤器，分别与文件名和目录名一起使用。
class FilenameFilter extends FilesystemRegexFilter {
//借助正则表达式过滤文件
public function accept() {
return ( ! $this->isFile() || preg_match($this->regex, $this->getFilename()));
}
}
class DirnameFilter extends FilesystemRegexFilter {
//借助正则表达式过滤目录
public function accept() {
return ( ! $this->isDir() || preg_match($this->regex, $this->getFilename()));
}
}下面的代码递归遍历目录内容。垃圾文件夹被过滤掉，仅保留PHP和HTML文件。
$directory = new RecursiveDirectoryIterator(__DIR__);
// Filter out ".Trash*" folders
$filter = new DirnameFilter($directory, '/^(?!\.Trash)/');
//过滤PHP/HTML文件
$filter = new FilenameFilter($filter, '/\.(?:php|html)$/');
foreach(new RecursiveIteratorIterator($filter) as $file) {
echo $file . PHP_EOL;
}使用上面的代码扫描多达2个级别的深度
$files = new RecursiveIteratorIterator($filter);
$files->setMaxDepth(1); // Two levels, the parameter is zero-based.
foreach($files as $file) {
echo $file . PHP_EOL;
}