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                # PHP readdir() 函數 ## 定義和用法 readdir() 函數返回由 opendir() 打開的目錄句柄中的條目。 若成功,則該函數返回一個文件名,否則返回 false。 ### 語法 ``` readdir(dir_stream) ``` | 參數 | 描述 | | --- | --- | | dir_stream | 必需。規定要使用的目錄句柄。 | ### 說明 返回目錄中下一個文件的文件名。文件名以在文件系統中的排序返回。 ## 例子 ``` <?php //打開 images 目錄 $dir = opendir("images"); //列出 images 目錄中的文件 while (($file = readdir($dir)) !== false) { echo "filename: " . $file . "<br />"; } closedir($dir); ?> ``` 輸出: ``` filename: . filename: .. filename: cat.gif filename: dog.gif filename: food filename: horse.gif ```
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