What is the is_bool method in PHP?

The is_bool method can be used to check if the variable is a Boolean.

Syntax

is_bool(mixed $value): bool

This method returns true if the passed value is a Boolean. Otherwise, it returns false.

Code

<?php 
  $test = true;
  printIsBoolean($test);
  $test = false;
  printIsBoolean($test);
  $test = 0;
  printIsBoolean($test);
  $test = 'true';
  printIsBoolean($test);
  function printIsBoolean($test){
    echo "The Value is: ";
    var_dump($test);
    echo "Is Boolean: ";
    var_dump(is_bool($test));
    
    echo "---------\n\n";
  }
?>

Explanation

In the code above:

  • We have used the is_bool method to check if the variable is a Boolean.

  • The is_bool method returns true for the value true and false.

  • The is_bool method returns false for the value 0(int) and 'false'(string) because it is not a Boolean type variable.

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