Learn PHP


Boolean


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


            <?PHP
                $bool = true;
                print "Bool is set to $bool\n";
                $bool = false;
                print "Bool is set to $bool\n";
            ?>
          

Output


            Bool is set to 1
Bool is set to 
          


Example 2


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

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

Output


            the variable equals 1!
the variable is true!            




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