PHP 7 – Scalar Type Declarations

In PHP 7, a new feature, Scalar type declarations, has been introduced. Scalar type
declaration has two options:


 coercive - coercive is default mode and need not to be specified.
 strict - strict mode has to explicitly hinted.

Following types for function parameters can be enforced using the above modes:

  • int
  • float
  • bool
  • string
  • interfaces
  • array
  • callable
     

Example – Coercive Mode

 // Coercive mode
 function sum(int ...$ints){

     return array_sum($ints);
 }
print(sum(2, '3', 4.1));
?>

 It produces the following browser output -

9

Example - Strict Mode

 // Strict mode

declare(strict_types=1);

function sum(int ...$ints){

    return array_sum($ints);

}
print(sum(2, '3', 4.1));

?>

 

It produces the following browser output -
 

Fatal error: Uncaught TypeError: Argument 2 passed to sum() must be of the type
integer, string given, ...
 

 

 

 


 

 

 

 

 

 

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