Iterator::rewind
If Iterator::valid() returns false, the foreach() loop will be terminated.
Iterator::valid
(PHP 5 >= 5.0.0)
Iterator::valid — Vérifie 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.
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User Contributed Notes
Iterator::valid - [3 notes]
seva dot lapsha at gmail dot com ¶
3 years ago
Voitcus at gmail dot com ¶
2 months ago
If your class implements also ArrayAccess interface, you could use as valid() body
function valid(){
return $this->offsetExists($this->position);
}
hyponiq at gmail dot com ¶
1 year ago
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)
?>