/**
* @return true | false
* @param $val bool The bool to invert
* @desc Returns the
*/
function invert_bool($val){
if($val == true)
  return false;
if($val == false)
  return true;
}


Let's see how much we can earn "by the hour" by increasing the lines of code of the above example.

No.

Philo

/**
* @return true | false
* @param $val bool The bool to invert
* @desc Returns the
*/
function invert_bool($val)
{
if($val == true)
  return false;
if($val == false)
  return true;
}

So

return !($val);

wouldn't suffice then.

Congratulations, IanH., you win the contract.

/**
* @return true | false
* @param $val bool The bool to invert
* @desc Returns the
*/
function invert_bool($val){
if($val == true)
  return false;
if($val == false)
  return true;
}
____________
here's my one and only contribution to this exercise.

function invert_bool($val)
{
bool retVal = false;
if($val == true)
  retVal = false;
else
{
  if($val == false)
    retVal == true;
  else
    retVal == false;
}
return retVal;
}

Right Simon,
One-liners are out of question.

I want documented answers [gnu style], with hyperlinks to describe every darn thing.

example answer:
try{
if($val.toString().equals(true))
{
return false;
}
else if($val.toString().notEquals(true))
{
return true
}
catch(Excception exObject)
{
print("THIS ERROR IS IMPOSSIBLE");
}
finally
{
__HALT;
}

This is roughly on-topic damn't.  Why do Indians continually want to program and/or talk about programming in the off-topic area? No wonder we outsource so much to your hard working bastards.

Amateurs!

/*
* @return true | false
* @param $val bool The bool to invert
* @desc Returns the inverse if the passed value
`* Expected values for $val:
*  true: True
*  false: False
*/

function invert_bool
(
$val  // Value to invert
)
{

/*
  * If the parameter is true...
  */
if
(
  $val == true
)
{
  /*
  * Return false
  */
  return false;
}

/*
  * If the parameter is false...
  */
if
(
  $val == false
)
{
  /*
  * Return true
  */
  return true;
}

/*
  * For all other values, assume it was false.
  */
return true; 

}

DARN!!
This is off-topic. Let the infidel thread burn in hell.

I'm sorry, IanH., but upon further review, management has decided to award the contract to Mat.

Congratulations, Mat. Well-done, old man.

Sadly I've actually worked places where that's not too far from the standard -- all parameters to everything had to be on a line of their own, every conditional had to be commented with what you're testing (generally with an explanation of why), and everything had 12 or so lines of comments MINIMUM at the top with copyright notices, who wrote it, who revised it, when, why, and all sorts. It was enough to make me cry...

Why not look here for your fun:

http://thedailywtf.com/forums/56201/ShowPost.aspx

Oh you got it from there.