DirectoryIterator::valid()
(PHP 5,PHP 7)
Check whether current DirectoryIterator position is a valid file
说明
public DirectoryIterator::valid(void) : bool
Check whether currentDirectoryIteratorposition is a valid file.
参数
此函数没有参数。
返回值
ReturnsTRUE
if the position is valid,otherwiseFALSE
范例
Example#1 ADirectoryIterator::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