oop optiona arguments

[whatson]

So I want to pass arguments through a method, but make them optional.

e.g.

class variables {

  public function method($var1, $var2, $var3) {
   echo $this->var1 = $var1;
   echo $this->var2 = $var2;
   echo $this->var3 = $var3;

  }

}

$test = new variables();
$test->method(variable1, variable2)

So I am passing 2 arguments to a method that takes 3 arguments. How can I make e.g. $var3 optional. Does it have to be something like

public function method($var1, $var2, $var3=false)

[skoff]

lets say your $var3 is a boolean variable you could do something like this :

public function methodName($var1, $var2, $var3 = false) {
 $this->var1 = $var1;
 $this->var2 = $var2;

 //if $var3 is true
 if ($var3) {
 //do something
 }

}

that way your $var3 parameter is optional and you can call your method with only the firsts two parameters.

[whatson]

right, but what if the $var3 was a string?

[skoff]

In the method you would write $var3 = null or $var3 = "" but i prefer null and after you can do your if with

If ($var3 != null) { }

[whatson]

great, so $var3=null, but if $var3 is set then it will equal that.

[coopster]

Precisely. See Functions example #3 for more information:

[php.net...]

[jojy]

If you want to strictly check whether a variable is null or not then use following code

$var = 'NULL';

if($var === NULL) {
echo 'It's null';
}