alive false is 1 true 0 which data type indicates..., Reported Questions, PHP

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Question:$alive=false; //$alive is false. 
  $alive=1;     //$alive is true. 
  $alive=0;     //$alive is false. 
  $alive=-1;     //$alive is true.  
 Which data type indicates the above example?

A Boolean 
B String 
C array 
D printf

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Question:$alive=false; //$alive is false. $alive=1; //$alive is true. $alive=0; //$alive is false. $alive=-1; //$alive is true. Which data type indicates the above example?

A Boolean

B String

C array

D printf

A