php - Why does this if require a default? -

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It is: 

  session :: is ('vaccine')? Session :: Mill ('vaccine'): 1;   
 I would like to leave it: 1 But then it fails for some reason, while TC is set up in the other?   
 
 
 If you already know that the value of  tk  is You do not have to use the  ()  function to check it.  
 Use only:  
  session :: find ('vaccine');

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