Echo False?

nemesis1931

Hello there.

I had made an object that returns true or false based on some condition, and well when i wanted to see what it was returining.. nothing was returned.. i thought I had done something wrong until i finally tried this

  echo FALSE;

   //doesnt work on print or print_r either
  print(FALSE); print_r(FALSE);

echo TRUE; //prints 1

  //this works too
  print(TRUE); print_r(TRUE); //prints 1

this doesnt appear to display anything.. im expecting 0, since echo TRUE; displays 1.

Any comments?

Dont tell me to go search the boards I already did.. even the php manual -- apparently echo is not a function =) but still why wont FALSE output 0?

olaf

Normally you validate a variable for true or false, what is in your case false or true?

Installer

The manual (see the users' notes on the linked page) explains that (nem's question) well.

olaf

and everytime there is a var.

LordShryku

Try this:

echo (int)FALSE;

nemesis1931

=) thanks for the input!

Installer

LordShryku's solution is interesting because echo takes a string. When a bool false is typecast as a string it becomes "" (null string). So in order to output a "0", you can first explicitly typecast it as an int, then php automatically typecasts that as a string to be echoed. So there are two typecasts happening, one explicit and one implicit.

echo false . '<br />';          // ""
echo (string) false . '<br />'; // ""
echo (int) false . '<br />';    // "0"
echo (float) false . '<br />';  // "0"
echo (array) false . '<br />';  // "Array"
echo (object) false . '<br />'; // "Object id #1"

olaf

Is there someone here who cna show an exapmple where you just need a false?

Installer

The only use I can think of, albeit without trying too hard, is for exploring the properties of the boolean value false. For examples see some of the previous posts in this thread.