Confirming false

[perikles]

Hello!

 

Just started getting into PHP!

 

I'd like to set a variable to false, and then check if it is set to false ( set to false = true  ), but I'm confused about assignment operators vs. comparison operators, no pun intended.

 

 = false 

or

 ==  false 

?

[Rifts]

$awesomeVar = false;

 

if ( $awesomeVar == false) {

    echo "its FALSE";

}

else {

    ehco "its NOT false";

}

[btherl]

If you want to check if a variable is really false, and not anything else, you should do this:

 

if ($var === false)

 

If you want to check if a variable is false or null or 0 or empty string, use this:

 

if ($var == false)

 

If you want to set a variable to false:

 

$var = false;

 

So to set and do a strict check:

 

$var = false;
if ($var === false) { print "False is true."; }

[perikles]

Excellent, thanks to you both!

[Pikachu2000]

Rifts, the problem with that is if the value of $awesomeVar is 0 (zero), it will evaluate to true. To check for boolean FALSE, you need to use the identical comparison === operator, not the equals comparison == operator.

if( $var === FALSE )

[perikles]

Did not really look at the identity operator before -- very interesting. That's what I need!