What if $name=Null ?

Question

The code in the video is

<?php
function get_info($name, $title = Null){
  if($title){
    echo "$name has arrived. They are with us as a $title.";
  } else {
    echo "$name has arrived. They have no title.";
  }
}
get_info("Mike");
?>

What if instead we want the name to be null?

<?php
function get_info($name= Null, $title ){

  if($name){
    echo "$name has arrived. They are with us as a $title.";
  } else {
    echo "There is no $name. This is $title.";
  }
}
get_info("frogs");
?>

What would we write in the parathesis? get_info();

I thought about this solution. Are there others?

<?php
function get_info($name= Null, $title="frogs" ){

  if($name){
    echo "$name has arrived. They are with us as  $title.";
  } else {
    echo "$name has arrived. They have no $title.";
  }
}

get_info();
?>

Answer 1 · 2015-10-08T22:34:06Z

October 8, 2015 10:34pm

Hi there, not sure what you are trying out here...

As you probably checked by now, last example would just output:

has arrived. They have no frogs.

because $name was not specified and "frogs" were set as default values. What you set as parameter values when declaring a function is called a 'default' value. A value that a function will use if no other value for that argument was supplied.

Take a look at this:

function calc ($a=2, $b=2){
    return $a * $b;
}
echo calc(); // returns 4
echo calc(3); // returns 6
echo calc(3,10); // returns 30

good luck!

Answer 2 · 2019-11-19T10:27:21Z

November 19, 2019 10:27am

I am having a similar question what if you wanted to echo has arrived. They have no dogs. I am not sure of an actually use case for this but just more of an outside the box thinking how do you pass just the second parameter? get_info('','dogs'); Would this be the correct use?

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Elena Paraschiv

Elena Paraschiv

What if $name=Null ?

2 Answers

deckey

deckey

Kyle Hunter

Kyle Hunter