[TYPO3-core] RFC: is_array check extension manager

[Michael Stucki]

Hi Ernesto,

> I must agree with Franz here. is_array already does an implicit "isset",
> so it is redundant to check for both. This is not documented anywhere
> explicitly, but can be extracted from the is_array documentation fragment:
>
> 	"Returns TRUE if var is an array, FALSE otherwise."
>
> If "var" is not even defined, it will also return FALSE (and NO warning,
> as Franz already demonstrated).

There's just no warning because error_reporting excludes warnings:

error_reporting = E_ALL ^ E_WARN

This is hardcoded somewhere in the TYPO3 code, but try it out without hiding 
the warnings:

=== cut ===
error_reporting(E_ALL);

$aa = array();
if (is_array($aa['aaa'])) {
        echo 'a';
}
=== cut ===

- michael
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