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(PHP 5 >= 5.1.0, PHP 7, PHP 8)
iterator_apply — Call a function for every element in an iterator
Calls a function for every element in an iterator.
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.
Hinweis: The function must return
true
in order to continue iterating over theiterator
.
args
An array of arguments; each element of
args
is passed to the callback
callback
as separate argument.
Returns the iteration count.
Beispiel #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));
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
APPLES BANANAS CHERRIES