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Booleans hold either true or false. Behind the scenes, booleans are integers.

false value

In addition, PHP considers the following values to be false :

  • The literal value false
  • The integer zero (0)
  • The float zero ( 0.0 )
  • An empty string ( " " )
  • The string zero ( "0" )
  • An array with zero elements
  • The special type null (including any unset variables)
  • A SimpleXML object that is created from an empty XML tag

All other values are considered true in a Boolean context.

We can assign true or false value to a boolean type variable.

Example 1

                $bool = true;
                print "Bool is set to $bool\n";
                $bool = false;
                print "Bool is set to $bool\n";


            Bool is set to 1
Bool is set to 

Example 2

                if($a==200) {
                    echo "the variable equals 1!\n";

                if($a==true) {
                echo "the variable is true!";


            the variable equals 1!
the variable is true!            

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