HEELPBOOK - PHP - Fatal error: Cannot use string offset as an array in... #######################

PHP5 Error message that is caused by attempting to assign a value to an array element of a variable that is declared as a string.

Example that generates error:


$foo='bar';
$foo[0]='bar';

Get error message Fatal error: Cannot use string offset as an array in...


##### Explanation:

$foo was declared as a string in $foo='bar'.

$foo[0] is trying to append an element onto a string variable.


Example that does not generate error:


$foo[0]='bar';
$foo='bar';

Does NOT generate error.


####### Explanation:

$foo[0]='bar' instantiates variable $foo as array since it has not been instantiated. Then assigns 'bar' to element $foo[0].

$foo='bar' implicitly re-declares $foo as a string and assigns 'bar' to it.


Example that does not generate error:


$foo='bar';
$foo=array();
$foo[0]='bar';


########## Explanation:

$foo='bar' implicitly declares $foo as a string variable then assigns 'bar' as the value.

$foo=array() explicitly re-declares $foo as an array.

$foo[0]='bar' can now be executed as $foo is declared as an array.



############ ARTICLE INFO #############

Article Month: April
Article Date: 25/04/2012
Permalink: http://heelpbook.altervista.org/2012/php-fatal-error-cannot-use-string-offset-as-an-array-in/
Source: http://informationideas.com/news/2006/06/14/fatal-error-cannot-use-string-offset-as-an-array-in/
Language: English

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