IteratorAggregate::getIterator
ArrayAccess::offsetExists
Predefined Interfaces and Classes
PHP Manual

# The ArrayAccess interface

(PHP 5 >= 5.0.0)

## Introdução

Interface to provide accessing objects as arrays.

## Resumo da Interface

ArrayAccess {
/* Métodos */
abstract public boolean offsetExists ( mixed `$offset` )
abstract public mixed offsetGet ( mixed `$offset` )
abstract public void offsetSet ( mixed `$offset` , mixed `$value` )
abstract public void offsetUnset ( mixed `$offset` )
}

Exemplo #1 Basic usage

`<?php
class obj implements arrayaccess {
private $container = array();
public function __construct() {
$this->container = array(
"one" => 1,
"two" => 2,
"three" => 3,
);
}
public function offsetSet($offset, $value) {
if (is_null($offset)) {
$this->container[] = $value;
} else {
$this->container[$offset] = $value;
}
}
public function offsetExists($offset) {
return isset($this->container[$offset]);
}
public function offsetUnset($offset) {
unset($this->container[$offset]);
}
public function offsetGet($offset) {
return isset($this->container[$offset]) ? $this->container[$offset] : null;
}
}
$obj = new obj;
var_dump(isset($obj["two"]));
var_dump($obj["two"]);
unset($obj["two"]);
var_dump(isset($obj["two"]));
$obj["two"] = "A value";
var_dump($obj["two"]);
$obj[] = 'Append 1';
$obj[] = 'Append 2';
$obj[] = 'Append 3';
print_r($obj);
?>`

O exemplo acima irá imprimir algo similar à:

    bool(true)
    int(2)
    bool(false)
    string(7) "A value"
    obj Object
    (
        [container:obj:private] => Array
            (
                [one] => 1
                [three] => 3
                [two] => A value
                [0] => Append 1
                [1] => Append 2
                [2] => Append 3
            )

    )

## Índice

- ArrayAccess::offsetExists — Whether a offset exists
- ArrayAccess::offsetGet — Offset to retrieve
- ArrayAccess::offsetSet — Offset to set
- ArrayAccess::offsetUnset — Offset to unset

IteratorAggregate::getIterator
ArrayAccess::offsetExists
Predefined Interfaces and Classes
PHP Manual