Php/docs/directoryiterator.valid

• PHP Manual
• DirectoryIterator
• Check whether current DirectoryIterator position is a valid file

DirectoryIterator::valid

(PHP 5, PHP 7)

DirectoryIterator::valid — Check whether current DirectoryIterator position is a valid file

说明

public DirectoryIterator::valid ( ) : 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$iterator = new DirectoryIterator(dirname(__FILE__));// Loop to end of iteratorwhile($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