PHP_CodeSniffer

The CGl says about the Array item declaration

Array components are declared each on a separate line. Such lines are indented with one more tab than the start of the declaration. The closing bracket is on the same indentation level as the variable. Every line containing an array item ends with a comma. This may be omitted if there are no further elements, at the developer's choice. Example:

<pre>
$thisIsAnArray = array(
    'foo' => 'bar',
    'baz' => array(
        0 => 1
    )
);
</pre>

Nested arrays follow the same pattern. This formatting applies even to very small and simple array declarations, e.g.

<pre>
$a = array(
    0 => 'b',
); 
</pre>

Lets create a sniff :)