How does this if statement read?

How does this if statement read out loud?

if (开发者_如何学Go!$_SESSION['stuff']) { 
    $age=12;
}

(Admin, please change the non-descript title since I don't know what to call the boolean expression in the if statement)

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If not stuff in $_SESSION

If the value (or lack thereof) at index stuff of Array $_SESSION evaluates to false, then set $age to INT value 12.

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Are you referring to the exclamation mark? That is a "not".

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If it's not the "stuff" session, set "age" to 12.