DirectoryIterator::isReadable()函數是PHP中的內置函數,用於檢查當前DirectoryIterator項是否可讀。
用法:
bool DirectoryIterator::isReadable( void )
參數:該函數不接受任何參數。
返回值:如果文件可讀,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::isReadable()函數:
示例1:
<?php
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
// Loop runs for each element of directory
foreach($directory as $dir) {
// Check for readable element
if($dir->isReadable()) {
// Display the filename
echo $dir->getFilename() . "<br>";
}
}
?>
輸出:
. .. applications.html bitnami.css dashboard favicon.ico geeks.PNG gfg.php img index.php Sublime Text Build 3211 x64 Setup.exe webalizer xampp
示例2:
<?php
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
// Loop runs while element is valid
while ($directory->valid()) {
// Check for readable element
if($directory->isReadable()) {
// Display the filename
echo $directory->getFilename() . "<br>";
}
// Move to the next element
$directory->next();
}
?>
輸出:
. .. applications.html bitnami.css dashboard favicon.ico geeks.PNG gfg.php img index.php Sublime Text Build 3211 x64 Setup.exe webalizer 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.isreadable.php
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