Numeric and integer keys

By chx ~ Posted Tue, 09/08/2009 - 16:28

<?php
$a = 1;
$b ->$a = 'foo';
var_export((array)$b);
var_export(array(1 => 'foo'));
?>

Results:

array (
  '1' => 'foo',
)array (
  1 => 'foo',
)

Observe the '1'. The array element after casting can not be reached via the [] operator. (And no, "'1'" wont do the trick.)

Comments

It's casting the 1 to a

Submitted by Dave Reid (not verified) on Tue, 09/08/2009 - 21:50.

It's casting the 1 to a string because class variables cannot start with numbers, just like functions. Doing $b->$a caused $a to be converted to a string. However, that is very WTF about not being able to retrieve the array element using []. At least you can still get it if $b is still an object and you can do var_export($b->$a).

That's actually pretty nifty

Submitted by PHPGod (not verified) on Fri, 07/30/2010 - 22:57.

That's actually pretty nifty -- I did not know that casting an object to an array causes numeric string keys to fail to convert. That should probably be a filed as bug.

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Numeric and integer keys

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