DirectoryIterator::valid()函數是PHP中的內置函數,用於檢查當前DirectoryIterator位置是否為有效文件。
用法:
bool DirectoryIterator::valid( void )
參數:該函數不接受任何參數。
返回值:如果位置有效,則此函數返回TRUE,否則返回FALSE。
以下示例程序旨在說明PHP中的DirectoryIterator::valid()函數:
示例1:
<?php
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
// Move to the third element
$directory->seek(2);
// Check the validity of directory element
if($directory->valid()) {
// Display the filename
echo $directory->getFilename();
}
?>
輸出:
applications.html
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();
}
?>
輸出:
0 => . 1 => .. 4 => dashboard 8 => img 11 => webalizer 12 => xampp
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.valid.php
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