(PHP 5 >= 5.3.6, PHP 7)
DirectoryIterator::getExtension — Gets the file extension
Retrieves the file extension.
此函数没有参数。
Returns a string containing the file extension, or an empty string if the file has no extension.
Example #1 DirectoryIterator::getExtension() example
<?php
$directory = new DirectoryIterator(__DIR__);
foreach ($directory as $fileinfo) {
if ($fileinfo->isFile()) {
echo $fileinfo->getExtension() . "\n";
}
}
?>
以上例程的输出类似于：
php txt jpg gz
Note:
This method is only available as of PHP 5.3.6. Another way of getting the extension is to use the pathinfo() function.
<?php
$extension = pathinfo($fileinfo->getFilename(), PATHINFO_EXTENSION);
?>