.. _null-as-array-offset:

Null As Array Offset
====================
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	:description:
		Null As Array Offset: Array indices may be integers or strings.
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	:twitter:title: Null As Array Offset
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	:og:title: Null As Array Offset
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	:og:description: Array indices may be integers or strings
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Array indices may be integers or strings. They may also be boolean or ``null``, although both these types are converted in integers and string (respectively).



In PHP 8.5, a warning is emitted when a null value is used as an index.

PHP code
________
.. code-block:: php

   <?php
   
   $array = ['a' => 2];
   $array[null] = 3;
   
   print $array['']; 
   print $array[null]; 
   
   ?>

Before
______
.. code-block:: output

   33

After
______
.. code-block:: output

   PHP Deprecated:  Using null as an array offset is deprecated, use an empty string instead
   
   Deprecated: Using null as an array offset is deprecated, use an empty string instead
   3PHP Deprecated:  Using null as an array offset is deprecated, use an empty string instead
   
   Deprecated: Using null as an array offset is deprecated, use an empty string instead
   3


PHP version change
__________________
This behavior changed in 8.5


Error Messages
______________

  + `Using null as an array offset is deprecated, use an empty string instead <https://php-errors.readthedocs.io/en/latest/messages/using-null-as-an-array-offset-is-deprecated%2C-use-an-empty-string-instead.html>`_