DirectoryIterator::key()函数是PHP中的内置函数,用于返回当前DirectoryIterator项的 key 。
用法:
string DirectoryIterator::key( void )
参数:该函数不接受任何参数。
返回值:此函数返回当前DirectoryIterator项的 key 。
以下示例程序旨在说明PHP中的DirectoryIterator::key()函数:
示例1:
<?php
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
// Loop runs for each element of directory
foreach($directory as $dir) {
// Display the key and filename
echo $dir->key() . " => " .
$dir->getFilename() . "<br>";
}
?>
输出:
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
示例2:
<?php
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
// Loop runs while directory is valid
while ($directory->valid()) {
// Check for directory element
if($directory->isDir()) {
// Display the key and filename
echo $directory->key() . " => " .
$directory->getFilename() . "<br>";
}
// Move to the next element
$directory->next();
}
?>
输出:
0 => . 1 => .. 4 => dashboard 8 => img 11 => webalizer 12 => xampp
注意:此函数的输出取决于服务器文件夹的内容。
参考: https://www.php.net/manual/en/directoryiterator.key.php
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