PHP DirectoryIterator rewind()用法及代碼示例

DirectoryIterator::rewind()函數是PHP中的內置函數，用於將DirectoryIterator倒回起始位置。

用法:

void DirectoryIterator::rewind( void )

參數：該函數不接受任何參數。

返回值：該函數不返回任何值。

以下示例程序旨在說明PHP中的DirectoryIterator::rewind()函數：

示例1:

<?php 
  
// Create a directory Iterator 
$directory = new DirectoryIterator(dirname(__FILE__)); 
  
// Loop runs while directory is valid 
while ($directory->valid()) { 
      
    // Check the element is directory 
    if($directory->isDir()) { 
  
        // Display the key and file name 
        echo $directory->key() . " => " .  
        $directory->getFilename() . "<br>"; 
    } 
  
    // Move to the next element 
    $directory->next(); 
} 
  
// Use rewind() function to move to 
// the start position 
$directory->rewind(); 
  
// Display the key and file name 
echo $directory->key() . " => " .  
        $directory->getFilename(); 
  
?>

輸出：

0 => .
1 => ..
4 => dashboard
8 => img
11 => webalizer
12 => xampp
0 => .

示例2:

<?php 
  
// Create a directory Iterator 
$directory = new DirectoryIterator(dirname(__FILE__)); 
  
// Loop runs for each element of directory 
foreach($directory as $dir) { 
  
    // Display key and file name 
    echo $dir->key() . " => " .  
    $dir->getFilename() . "<br>"; 
} 
  
// Use rewind() function to move to 
// the start position 
$directory->rewind(); 
  
// Display key and file name 
echo $directory->key() . " => " .  
        $directory->getFilename(); 
  
?>

輸出：

0 => .
1 => ..
2 => applications.html
3 => bitnami.css
4 => dashboard
5 => favicon.ico
6 => geeks.PNG
7 => gfg.php
8 => img
9 => index.php
10 => Sublime Text Build 3211 x64 Setup.exe
11 => webalizer
12 => xampp
0 => .

注意：此函數的輸出取決於服務器文件夾的內容。

參考： https://www.php.net/manual/en/directoryiterator.rewind.php

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注：本文由純淨天空篩選整理自jit_t大神的英文原創作品 PHP | DirectoryIterator rewind() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。