php - What does this mean? $length = null === $length ? strlen($data) : (int)$length ; -

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I know about the Ternary operator, more or less but I am unable to read this line. 

  $ length = zero === $ length? Strlen ($ data): (int) $ length;

$ length = null === $ What is the length?

Thank you very much, MEM

$ length is the value of null ,

It means: "itemprop =" text ">

code> strollon Otherwise, (infinite) $ length .

It's easy to understand that the bracket is placed in the right place: 

  $ length = (Zero === $ length)? Strlen ($ data): (int) $ length;

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