This declaration may include an initialization, but this initialization must be a constant value--that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.
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I assume the code is from within a class declaration.
My guess would be that you cannot access $this at this point.
Try setting the array in the constructor.
function __construct() {
$this->_queryArray = array( ... );
}