DirectoryIterator::valid
(PHP 5, PHP 7)
DirectoryIterator::valid — Check whether current DirectoryIterator position is a valid file
说明
public
DirectoryIterator::valid (
void ) :
bool
Check whether current DirectoryIterator position is a valid file.
参数
此函数没有参数。
返回值
Returns TRUE if the position is valid, otherwise FALSE
范例
Example #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
?>
参见
- 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() - 检查当前位置是否有效
