PHP 7.0.6 Released

A classe ArrayIterator

Introdução

Este iterator permite remover e modificar valores e chaves quando iterando arrays e objetos.

Quando você quiser iterar o mesmo array múltiplas vezes você precisa instanciar ArrayObject e criar instâncias de ArrayIterator que é consultado usando foreach ou chamando o método getIterator() manualmente.

Sinopse da classe

ArrayIterator implements Iterator , Traversable , ArrayAccess , SeekableIterator , Countable {
/* Métodos */
public void append ( mixed $value )
public void asort ( void )
public __construct ([ mixed $array = array() [, int $flags = 0 ]] )
public int count ( void )
mixed current ( void )
public array getArrayCopy ( void )
public void getFlags ( void )
mixed key ( void )
public void ksort ( void )
public void natcasesort ( void )
public void natsort ( void )
void next ( void )
public void offsetExists ( string $index )
public mixed offsetGet ( string $index )
public void offsetSet ( string $index , string $newval )
public void offsetUnset ( string $index )
void rewind ( void )
void seek ( int $position )
public string serialize ( void )
public void setFlags ( string $flags )
public void uasort ( string $cmp_function )
public void uksort ( string $cmp_function )
public string unserialize ( string $serialized )
bool valid ( void )
}

Índice

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User Contributed Notes 5 notes

up
12
Relakuyae
4 years ago
Need a callback on an iterated value, but don't have PHP 5.4+?  This makes is stupid easy:

<?php
class ArrayCallbackIterator extends ArrayIterator {
  private
$callback;
  public function
__construct($value, $callback) {
   
parent::__construct($value);
   
$this->callback = $callback;
  }

  public function
current() {
   
$value = parent::current();
    return
call_user_func($this->callback, $value);
  }
}
?>

You can use it pretty much exactly as the Array Iterator:

<?php
$iterator1
= new ArrayCallbackIterator($valueList, "callback_function");
$iterator2 = new ArrayCallbackIterator($valueList, array($object, "callback_class_method"));
?>
up
3
Venelin Vulkov
7 years ago
Another fine Iterator from php . You can use it especially when you have to iterate over objects

<?php
$fruits
= array(
   
"apple" => "yummy",
   
"orange" => "ah ya, nice",
   
"grape" => "wow, I love it!",
   
"plum" => "nah, not me"
);
$obj = new ArrayObject( $fruits );
$it = $obj->getIterator();

// How many items are we iterating over?

echo "Iterating over: " . $obj->count() . " values\n";

// Iterate over the values in the ArrayObject:
while( $it->valid() )
{
    echo
$it->key() . "=" . $it->current() . "\n";
   
$it->next();
}

// The good thing here is that it can be iterated with foreach loop

foreach ($it as $key=>$val)
echo
$key.":".$val."\n";

/* Outputs something like */

Iterating over: 4 values
apple
=yummy
orange
=ah ya, nice
grape
=wow, I love it!
plum=nah, not me

?>

Regards.
up
2
Sean Burlington
6 years ago
and to iterate recursively use the (sparsely documented)  RecursiveArrayIterator

<?php

$fruits
= array(
               
"apple" => "yummy",
               
"orange" => "ah ya, nice",
               
"grape" => "wow, I love it!",
                
"plum" => "nah, not me"
               
);

$veg = array("potato" => "chips", "carrot" => "soup");
$grocery = array($fruits, $veg);
$obj = new ArrayObject( $grocery );

$it = new RecursiveIteratorIterator( new RecursiveArrayIterator($grocery));

foreach (
$it as $key=>$val)
echo
$key.":".$val."\n";

?>

Output
--------
apple:yummy
orange:ah ya, nice
grape:wow, I love it!
plum:nah, not me
potato:chips
carrot:soup
up
0
daniel dot rutkoski at gmail dot com
7 months ago
<?php
class PrintArray
{
    private
$code = null;

    function
__construct ($val)
    {
       
$this->code = $val;
       
$this->_print();
    }
   
    private function
arrayIterator($val, $grau)
    {
       
$grau++;
       
$arr = new \ArrayIterator($val);
        while (
$arr->valid())
        {
            if(
is_array($arr->current()))
            {
               
$this->arrayIterator($arr->current(), $grau);
            }
            else
            {
               
$this->code .= str_repeat(" ", (4 * $grau)) . $arr->key() . " : " . $arr->current() . PHP_EOL;
            }
           
$arr->next();
        }
    }
   
    private function
_print()
    {
        if (
is_array($this->code))
        {
           
$arr = new \ArrayIterator($this->code);
           
$this->code = 'array(' . PHP_EOL;
            while (
$arr->valid())
            {
                if(
is_array($arr->current()))
                {
                   
$this->arrayIterator($arr->current(), 0);
                }
                else
                {
                   
$this->code .= $arr->key() . " : " . $arr->current() . "\n";
                }
               
$arr->next();
            }
           
$this->code .= ')';
        }
        return
$this;
    }
   
    public function
getVal ()
    {
        return
$this->code;
    }
}

$arr = array(
    array(
       
'ok' => 1, array(9,7,5,9,'a','b'=>array(1,2)),
       
'error' => 2, array('h','u','o')
    )
    ,
'array'
);
$pArray = new PrintArray($arr);
var_dump($pArray->getVal());
up
-13
foobuilder at gmail dot com
5 years ago
Unsetting all keys of an ArrayItem within foreach will always leave the second key:

<?php
$items
= new ArrayObject(range(0, 9));

while (list(
$k, $v) = each($items)) {
    unset(
$items[$k]);
}

print_r($items);

//  ArrayIterator Object
//  (
//      [storage:ArrayIterator:private] => Array
//          (
//              [1] => 1
//          )
//  )
?>

I'm not sure if this is a bug as unsetting keys within foreach is usually a bad idea to begin with (use while instead), but it's something to be aware of.
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