iterator_to_array

(PHP 5 >= 5.1.0)

iterator_to_arrayCopy the iterator into an array

Description

array iterator_to_array ( Traversable $iterator [, bool $use_keys = true ] )

Copy the elements of an iterator into an array.

Parameters

iterator

The iterator being copied.

use_keys

Whether to use the iterator element keys as index.

In PHP 5.5 and later, if a key is an array or object, a warning will be generated. NULL keys will be converted to an empty string, double keys will be truncated to their integer counterpart, resource keys will generate a warning and be converted to their resource ID, and boolean keys will be converted to integers.

Return Values

An array containing the elements of the iterator.

Changelog

Version Description
5.5.0 iterator_to_array() gained support for key types other than integer and string when the use_keys parameter is enabled.
5.2.1 The use_keys parameter was added.

Examples

Example #1 iterator_to_array() example

<?php
$iterator 
= new ArrayIterator(array('recipe'=>'pancakes''egg''milk''flour'));
var_dump(iterator_to_array($iteratortrue));
var_dump(iterator_to_array($iteratorfalse));
?>

The above example will output:

array(4) {
  ["recipe"]=>
  string(8) "pancakes"
  [0]=>
  string(3) "egg"
  [1]=>
  string(4) "milk"
  [2]=>
  string(5) "flour"
}
array(4) {
  [0]=>
  string(8) "pancakes"
  [1]=>
  string(3) "egg"
  [2]=>
  string(4) "milk"
  [3]=>
  string(5) "flour"
}

Коментарии

Using the boolean param :

<?php

$first 
= new ArrayIterator( array('k1' => 'a' 'k2' => 'b''k3' => 'c''k4' => 'd') );
$second = new ArrayIterator( array( 'k1' => 'X''k2' => 'Y''Z' ) );

$combinedIterator= new AppendIterator();
$combinedIterator->append$first );
$combinedIterator->append$second );

var_dumpiterator_to_array($combinedIteratorfalse) );

?>

will output : 

array(7) (
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
  [4]=>
  string(1) "X"
  [5]=>
  string(1) "Y"
  [6]=>
  string(1) "Z"
)

<?php

var_dump
iterator_to_array($combinedIteratortrue) );

?>

will output (since keys would merge) :

array(5) (
  ["k1"]=>
  string(1) "X"
  ["k2"]=>
  string(1) "Y"
  ["k3"]=>
  string(1) "c"
  ["k4"]=>
  string(1) "d"
  [0]=>
  string(1) "Z"
)
2008-12-10 00:42:37
http://php5.kiev.ua/manual/ru/function.iterator-to-array.html
To generate an deep array from nested iterators:

<?php
function iterator_to_array_deep(\Traversable $iterator$use_keys true) {
   
$array = array();
    foreach (
$iterator as $key => $value) {
        if (
$value instanceof \Iterator) {
           
$value iterator_to_array_deep($value$use_keys);
        }
        if (
$use_keys) {
           
$array[$key] = $value;
        } else {
           
$array[] = $value;
        }
    }
    return 
$array;
}
?>

I use it to test an iterator: https://gist.github.com/jm42/cb328106f393eeb28751
2014-10-26 22:36:33
http://php5.kiev.ua/manual/ru/function.iterator-to-array.html
Автор:
When using iterator_to_array() on an SplObjectStorage object, it's advisable to set $use_keys to false.

The resulting array is identical, since the iterator keys produced by SplObjectStorage::key() are always integers from 0 to (COUNT-1). Passing $use_keys=false cuts out the unnecessary calls to SplObjectStorage::key(), giving a slight performance advantage.
2015-06-08 00:21:28
http://php5.kiev.ua/manual/ru/function.iterator-to-array.html
Generator approach

function scandir_deep($dir)
{
  foreach (scandir($dir) as $key => $value)
    if (in_array($value, [".",".."]))
      continue;
    else if (is_dir($dir . DIRECTORY_SEPARATOR . $value))
      yield $value => scandir_deep($dir . DIRECTORY_SEPARATOR . $value);
    else
      yield $value;
}
2017-01-22 06:26:54
http://php5.kiev.ua/manual/ru/function.iterator-to-array.html
One important thing to remember is that in iterator can be infinite. Not all iterators necessarily end. If iterator_to_array is used on such an iterator, it will exhaust the available memory, and throw a fatal error.

For example, consider the following code:

<?php

function fibonacci(): Generator
{
    yield 
$a 1;
    yield 
$b 2;

   
start:
    yield 
$c $a $b;
   
$a $b;
   
$b $c;
    goto 
start;
}

$fibonacciSequence fibonacci();
iterator_to_array($fibonacciSequence);

?>

Since <?php fibonacci(); ?> generates an infinite fibonacci sequence, which is valid, since it is actually an infinite sequence, then attempting to convert it to an array will fail.
2022-03-21 17:55:58
http://php5.kiev.ua/manual/ru/function.iterator-to-array.html

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