SplFixedArray::offsetExists

(PHP 5 >= 5.3.0)

SplFixedArray::offsetExistsReturns whether the requested index exists

Description

public bool SplFixedArray::offsetExists ( int $index )

Checks whether the requested index index exists.

Parameters

index

The index being checked.

Return Values

TRUE if the requested index exists, otherwise FALSE

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depoemarc at swap dot fn dot ln dot googlemail dot com
1 month ago
It should be noted that offsetExists behaves like "offsetIsSet" rather than "offsetIsValid":

<?php
$arr
= new SplFixedArray(3);
var_dump($arr->offsetExists(1)); // false

$arr[1] = 42; // $arr->offsetSet(1, 42);
var_dump($arr->offsetExists(1)); // true

$arr[1] = null; // $arr->offsetSet(1, null);
var_dump($arr->offsetExists(1)); // true

unset($arr[1]); // $arr->offsetUnset(1);
var_dump($arr->offsetExists(1)); // false

var_dump($arr);
/*
object(SplFixedArray)[1]
  null
  null
  null
*/
?>
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