La clase FilterIterator

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

Introducción

Este iterador abstracto filtra valores no deseados. Esta clase debería ser ampliada para implementar filtros personalizados. FilterIterator::accept() debe ser implementado en la subclase.

Sinopsis de la Clase

abstract class FilterIterator extends IteratorIterator {

/* Métodos */

public __construct(Iterator $iterator)

public accept(): bool

public current(): mixed

public key(): mixed

public next(): void

public rewind(): void

public valid(): bool

/* Métodos heredados */

public IteratorIterator::current(): mixed

public IteratorIterator::getInnerIterator(): ?Iterator

public IteratorIterator::key(): mixed

public IteratorIterator::next(): void

public IteratorIterator::rewind(): void

public IteratorIterator::valid(): bool

}

Tabla de contenidos

FilterIterator::accept — Comprueba si el elemento actual del iterador es aceptable
FilterIterator::__construct — Construye un filterIterator
FilterIterator::current — Obtiene el valor del elemento actual
FilterIterator::key — Obtiene la clave actual
FilterIterator::next — Mueve el iterador a la siguiente posición
FilterIterator::rewind — Rebobina el iterador
FilterIterator::valid — Comprueba si el elemento actual es válido

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User Contributed Notes 3 notes

down

Venelin Vulkov ¶

16 years ago

The code below is a simple example of usage . Note that the method which does the actual job is accept. 

<?php
class UserFilter extends FilterIterator 
{
    private $userFilter;
    
    public function __construct(Iterator $iterator , $filter )
    {
        parent::__construct($iterator);
        $this->userFilter = $filter;
    }
    
    public function accept()
    {
        $user = $this->getInnerIterator()->current();
        if( strcasecmp($user['name'],$this->userFilter) == 0) {
            return false;
        }        
        return true;
    }
}

$array = array(
array('name' => 'Jonathan','id' => '5'),
array('name' => 'Abdul' ,'id' => '22')
);

$object = new ArrayObject($array);

// Note it is case insensitive check in our example due the usage of strcasecmp function
$iterator = new UserFilter($object->getIterator(),'abdul');

foreach ($iterator as $result) {
    echo $result['name'];
}

/* Outputs Jonathan */

?>
Regards.

down

Anonymous ¶

10 years ago

A little test about the function call order:

<?php

class TestIterator extends IteratorIterator
{
    public function key()
    {
        echo  __FUNCTION__, PHP_EOL;
        return parent::key();
    }

    public function next()
    {
        echo  __FUNCTION__, PHP_EOL;
        return parent::next();
    }

    public function rewind()
    {
        echo  __FUNCTION__, PHP_EOL;
        return parent::rewind();
    }

    public function valid()
    {
        echo  __FUNCTION__, PHP_EOL;
        return parent::valid();
    }
}

class TestFilterIterator extends FilterIterator
{
    public function accept()
    {
        echo  __FUNCTION__, PHP_EOL;
        return true;
    }
}

$iterator = new ArrayIterator(array('a', 'b', 'c'));

foreach (new TestFilterIterator(new TestIterator($iterator)) as $k => $v) {
    echo PHP_EOL;
}

?>

This will output the following:

rewind
valid
key
accept

next
valid
key
accept

next
valid
key
accept

next
valid

down

-1

Anonymous ¶

2 years ago

Filter object collection by method:
<?php
/**
  * @method object current()
  */
class CollectionFilterIterator extends FilterIterator
{
     private $methodName;
     private $methodArguments;

     public function function __construct(Iterator $collection, string $methodName, array $methodArguments = [])
     {
             parent::__construct($collection);
             $this->methodName = $methodName;
             $this->methodArguments = array_values($methodArguments);
     }

     public function accept(): bool
     {
             return (bool) $this->current()->{$this->methodName}(...$this->methodArguments);
             // or call_user_func_array([$this->current(), $this->methodName], $this->methodArguments);
     }
}
?>

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