DirectoryIterator::valid()

(PHP 5,PHP 7)

Check whether current DirectoryIterator position is a valid file

说明

publicDirectoryIterator::valid(void) : bool

Check whether currentDirectoryIteratorposition is a valid file.

参数

此函数没有参数。

返回值

ReturnsTRUEif 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