Booleans can be one of two constants:

true

false

These values are not case sensitive, therefore true is the same as TRUE

​

booleans are also often used in control structures, either directly or as

a result of an operation. For example:

​

if ($waterDrankToday > 3.7) {

 echo "Good work staying hydrated!";

 if ($havingABadDay)

   hug();

}

else

  echo "You should drink more water";

$value = "true"; // The value you want to convert to boolean

​

// Using boolval()

$convertedValue = boolval($value);

var_dump($convertedValue); // Output: bool(true)

​

// Using type casting

$convertedValue = (bool) $value;

var_dump($convertedValue); // Output: bool(true)

<?php

$foo = True; // assign the value TRUE to $foo

?>

​

​