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Clarity on Session Code

#1
What does this line of code imply: ($this->session->userdata('is_user_login')==TRUE)?'4':'4'

Thanks in advance
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#2
The ternary operator in this statement will evaluate to a text value '4', whether the session userdata element has a value of TRUE or not. Doesn't appear to be very useful when taken outside of the context in which this term is used.

If you could provide more of the code in which this statement is used, it might help us give a better answer.
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#3
I hope this example with other values will make it more clear. Setting both cases to the same value (4) does not make any sense.

PHP Code:
$myValue = ($this->session->userdata('is_user_login') == TRUE) ? '4' '6'); 

This is shorthand for this if / else statement

PHP Code:
if ($this->session->userdata('is_user_login') == TRUE) {
 
   $myValue '4';
} else {
 
   $myValue '6';

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#4
thank you twpmarketing and Diederik for your help on this. Very clear
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