rewinddir

(PHP 4, PHP 5, PHP 7, PHP 8)

rewinddir — 倒回目录句柄

说明

rewinddir(?resource $dir_handle = null): void

将 dir_handle 指定的目录流重置到目录的开头。

参数

dir_handle: 之前使用 opendir() 打开的目录句柄 resource。如果未指定目录句柄，则假设是 opendir() 打开的最后一个链接。

返回值

没有返回值。

更新日志

版本	说明
8.0.0	现在 `dir_handle` 允许为 null。

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用户贡献的备注 2 notes

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ASchmidt at Anamera dot net ¶

6 years ago

It is crucial to note that rewinddir() does not simply start over at the beginning of the SAME directory list. Instead, this function first re-reads the directory - thus any file that were deleted (or inserted) since the original opendir() will be reflected after "rewinding".

In that respect, rewinddir() is equivalent to a closedir(), opendir() sequence, but without obtaining a new handle.

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osamahussain897 at gmail dot com ¶

6 years ago

/* Source Code */

<?php
$dir = "/images/";

// Open a directory, and read its contents
if (is_dir($dir)){
  if ($dh = opendir($dir)){
    // List files in images directory
    while (($file = readdir($dh)) !== false){
      echo "filename:" . $file . "<br>";
    }
    rewinddir();
    // List once again files in images directory
    while (($file = readdir($dh)) !== false){
      echo "filename:" . $file . "<br>";
    }
    closedir($dh);
  }
}
?>

/* Result */

filename: cat.gif
filename: dog.gif
filename: horse.gif
filename: cat.gif
filename: dog.gif
filename: horse.gif