(PHP 5 >= 5.0.0, PHP 7)
ArrayIterator::valid — Check whether array contains more entries
此函数没有参数。
Returns TRUE if the iterator is valid, otherwise FALSE
Example #1 ArrayIterator::valid() example
<?php
$array = array('1' => 'one');
$arrayobject = new ArrayObject($array);
$iterator = $arrayobject->getIterator();
var_dump($iterator->valid()); //bool(true)
$iterator->next(); // advance to the next item
//bool(false) because there is only one array element
var_dump($iterator->valid());
?>