Conditionally add element inside an array(…)

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You can use the conditional operator cond ? true-expr : false-expr:

$someConfig = array(
    'k1' => 'v1',
    'k2' => $cond ? 'v2a' : 'v2b'
);

The conditional expression $cond ? 'v2a' : 'v2b' will yield 'v2a' if $cond evaluates to true and 'v2b' otherwise. But this works only with the value of a key.

If you only want to add a key based on a condition, you need to use a separate if:

$someConfig = array('k1' => 'v1');
if ($cond) {
    $someConfig['k2'] = 'v2';
}

Edit    You can add keys conditionally without a variable using the array union operator or array_merge:

array('k1' => 'v1') + ($cond ? array('k2' => 'v2') : array())
array_merge(array('k1' => 'v1'), $cond ? array('k2' => 'v2') : array())

Now you need to decide what’s more readable or better to maintain.

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