# GlobIterator::__construct

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

GlobIterator::__construct — Construct a directory using glob

### 说明

public GlobIterator::__construct(string `$pattern`, int `$flags` = FilesystemIterator::KEY_AS_PATHNAME | FilesystemIterator::CURRENT_AS_FILEINFO)

Constructs a new directory iterator from a glob expression.

### 参数

`pattern`

  A glob() pattern.

`flags`

  Option flags, the flags may be a bitmask of the FilesystemIterator constants.

### 错误／异常

Throws an UnexpectedValueException if the `directory` does not exist.

Throws a ValueError if the `directory` is an empty string.

### 更新日志

版本 | 说明
--- | ---
8.0.0 | Now throws a ValueError if `directory` is an empty string; previously it threw a RuntimeException.

### 示例

示例 #1 GlobIterator example

`<?php
$iterator = new GlobIterator('*.dll', FilesystemIterator::KEY_AS_FILENAME);
if (!$iterator->count()) {
echo 'No matches';
} else {
$n = 0;
printf("Matched %d item(s)\r\n", $iterator->count());
foreach ($iterator as $item) {
printf("[%d] %s\r\n", ++$n, $iterator->key());
}
}
?>`

以上示例的输出类似于：

    Matched 2 item(s)
    [1] php5ts.dll
    [2] php_gd2.dll

### 参见

- DirectoryIterator::__construct() - Constructs a new directory iterator from a path
- GlobIterator::count() - Get the number of directories and files
- glob() - 寻找与模式匹配的文件路径

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