Question

I have some strange issue with isset() function in PHP.
Let me show… .

<?php

$aTestArray = array(
    'index' => array(
        'index' => 'Główna'
    ),
    'dodaj' => 'Dodaj ogłoszenie',
);

var_dump( isset($aTestArray['index']) );
var_dump( isset($aTestArray['index']['index']) );
var_dump( isset($aTestArray['dodaj']) );

var_dump( isset($aTestArray['index']['none']) );
var_dump( isset($aTestArray['index']['none']['none2']) );

// This unexpectedly returns TRUE
var_dump( isset($aTestArray['dodaj']['none']) );
var_dump( isset($aTestArray['dodaj']['none']['none2']) );


?>

The var_dump’s will return:

bool(true)
bool(true)
bool(true)

bool(false)
bool(false)
bool(true)
bool(false)

Why the sixth var_dump() return TRUE ?

Answer 1

When using the [] operators on a string, it will expect an integer value. If it does not get one, it will convert it. ['none'] is converted to [0] which, in your case, is a D.