DirectoryIterator::valid

(PHP 5)

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

说明

public bool DirectoryIterator::valid ( void )

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

PHP手册 - N: Check whether current DirectoryIterator position is a valid file

用户评论:

josh dot butts at vertive dot com (02-Sep-2008 05:47)

This function, as far as I can tell, returns boolean, not string. $di = new DirectoryIterator(/path/to/iterate); while ($di->valid()) { echo $di->getPathname() . "\n"; $di->next(); }