iterator_apply

(PHP 5 >= 5.1.0, PHP 7)

iterator_applyCall a function for every element in an iterator

Descrierea

int iterator_apply ( Traversable $iterator , callable $function [, array $args ] )

Calls a function for every element in an iterator.

Parametri

iterator

The class to iterate over.

function

The callback function to call on every element.

Notă: The function must return TRUE in order to continue iterating over the iterator.

args

Arguments to pass to the callback function.

Valorile întoarse

Returns the iteration count.

Exemple

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));
?>

Exemplul de mai sus va afișa:

APPLES
BANANAS
CHERRIES

A se vedea și

  • array_walk() - Apply a user supplied function to every member of an array

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User Contributed Notes 1 note

up
0
ycgambo at outlook dot com
22 days ago
$args is an array and each of its elements are passed to the callback as separate arguments.

so this is the right way to get args:

<?php
$ai
= new ArrayIterator(range(0, 2));

iterator_apply($ai, function() {
   
var_dump(func_get_args());     // use this func
   
return true;
}, array(
1, 2));
?>

output:

array(2) {
  [0] =>
  int(1)
  [1] =>
  int(2)
}
array(2) {
  [0] =>
  int(1)
  [1] =>
  int(2)
}
array(2) {
  [0] =>
  int(1)
  [1] =>
  int(2)
}

--------------------------------------------------
or list each args:

<?php
$ai
= new ArrayIterator(range(0, 2));

iterator_apply($ai, function($arg1, $arg2, $arg3) {
   
var_dump([$arg1, $arg2, $arg3]);
    return
true;
}, array(
1, 2));
?>

same output.
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