DirectoryIterator::valid
(PHP 5, PHP 7, PHP 8)
DirectoryIterator::valid — Check whether current DirectoryIterator position is a valid file
說明
public DirectoryIterator::valid(): bool
Check whether current DirectoryIterator position is a valid file.
參數
此函式沒有參數。
返回值
Returns true if the position is valid, otherwise false
範例
示例 #1 A DirectoryIterator::valid() example
<?php
$iterator = new DirectoryIterator(dirname(__FILE__));
// Loop to end of iterator
while($iterator->valid()) {
$iterator->next();
}
$iterator->valid(); // FALSE
$iterator->rewind();
$iterator->valid(); // TRUE
?>
參見
- DirectoryIterator::current() - Return the current DirectoryIterator item
- DirectoryIterator::key() - Return the key for the current DirectoryIterator item
- DirectoryIterator::next() - Move forward to next DirectoryIterator item
- DirectoryIterator::rewind() - Rewind the DirectoryIterator back to the start
- Iterator::valid() - 檢查目前位置是否有效