How can I call same php function with a parameter and without a parameter simultaneously? [duplicate]

Question

My function is like this:

<?php
function facebook_friend_list($username){
............................................
............................................
echo "Number of friends:". $N ;
}
?>

My problem: I have to call This function like this :

facebook_friend_list($a);
facebook_friend_list();
facebook_friend_list($t);
............................
............................

inside a loop. So, sometimes this function is getting parameter and sometimes it is not getting. When it does not get parameter, it shows "Missing argument 1 for facebook_friend_list(), called in........................................................."

How to solve this problem?

Assign a default value to your parameter like function facebook_friend_list($username = '') or whatever default value you need — Mr. Alien
– Mr. Alien, Commented Jan 11, 2015 at 6:32
Can your function handle an empty string or NULL as parameter? If so, explicitly pass that, or make it the default param value in the function declaration. See php.net/manual/en/… — mario
– mario, Commented Jan 11, 2015 at 6:32
Why do you have to call the function without arguments? What is the meaning of "asking for the friend list of <nobody>" ? — Erwin Bolwidt
– Erwin Bolwidt, Commented Jan 11, 2015 at 6:33

Tiger · Accepted Answer · 2015-01-11 06:34:42Z

1

<?php

  function facebook_friend_list($username = null){

    if($username == null){
         // argument is not given stuff 
    }

    if($username != null){
         // argument is gived to access use :-  echo $username;
    }

    ............................................
    ............................................
   echo "Number of friends:". $N ;
 }

?>

Thanks :)

answered Jan 11, 2015 at 6:34

Tiger

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Comments

Brad Mace · Accepted Answer · 2015-01-11 06:33:35Z

0

You really ought to tell us more about what you're trying to accomplish, but you can make parameters optional by specifying defaults:

function facebook_friend_list($username = null) {
    ...
}

answered Jan 11, 2015 at 6:33

Brad Mace

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Comments

Nerixel · Accepted Answer · 2015-01-11 06:34:13Z

0

Change the line

function facebook_friend_list($username){

to

function facebook_friend_list($username = '') {

Then, within the function facebook_friend_list(), make sure to add code to handle the situation when the string is empty.

You can also use a value other than a default string, for example if you wanted it to use a certain username by default, you could type this instead:

function facebook_friend_list($username = "exampleusername") {

answered Jan 11, 2015 at 6:34

Nerixel

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Comments

Chamara Maduranga · Accepted Answer · 2015-01-11 06:35:17Z

0

try this ,

inside the loop
  if($var != null){
		facebook_friend_list($var);
  }else{
		assign 0 ;
  }

answered Jan 11, 2015 at 6:35

Chamara Maduranga

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