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IteratorAggregate> <Iterator::rewind
[edit] Last updated: Fri, 25 May 2012

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Iterator::valid

(PHP 5 >= 5.0.0)

Iterator::validVérifie si la position courante est valide

Description

abstract public boolean Iterator::valid ( void )

Cette méthode est appelée après Iterator::rewind() et Iterator::next() pour vérifier si la position courante est valide.

Liste de paramètres

Cette fonction ne contient aucun paramètre.

Valeurs de retour

La valeur retournée sera transtypée en booléen, puis, évaluée. Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.



add a note add a note User Contributed Notes Iterator::valid
hyponiq at gmail dot com 26-Sep-2011 04:12
Take consideration when utilizing this method and using the returned value of isset([value]). The value of isset([value]) will be false for null values.

I ran into this problem when checking isset([value]) against array elements whose value was null.

Example:
<?php
$array
= array(null, 1, 2, 3);
$isSet = isset($array[0]);
var_dump($isSet); // output: boolean(false)

class AClass {
    public
$array = (null, 1, 2, 3);
    function
valid() {
        return isset(
$this->array[0]);
    }
}

$class = new AClass;
var_dump($class->valid()); // output: boolean(false)
?>
seva dot lapsha at gmail dot com 01-Aug-2009 06:19
If Iterator::valid() returns false, the foreach() loop will be terminated.

 
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