iterator_apply

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

iterator_applyCall a function for every element in an iterator

Descrizione

iterator_apply(Traversable $iterator, callable $callback, ?array $args = null): int

Calls a function for every element in an iterator.

Elenco dei parametri

iterator

The iterator object to iterate over.

callback

The callback function to call on every element. This function only receives the given args, so it is nullary by default. If count($args) === 3, for instance, the callback function is ternary.

Nota: The function must return true in order to continue iterating over the iterator.

args

An array of arguments; each element of args is passed to the callback callback as separate argument.

Valori restituiti

Returns the iteration count.

Esempi

Example #1 iterator_apply() example

<?php
function print_caps(Iterator $iterator) {
echo
strtoupper($iterator->current()) . "\n";
return
TRUE;
}

$it = new ArrayIterator(array("Apples", "Bananas", "Cherries"));
iterator_apply($it, "print_caps", array($it));
?>

Il precedente esempio visualizzerà:

APPLES
BANANAS
CHERRIES

Vedere anche:

  • array_walk() - Esegue una funzione su ogni elemento dell'array