isset/unset

[pcbrainbuster]

Hello ,

Can anyone please explain the isset and unset functions in php in relation to javascript (this will make it easier)

[boxxertrumps]

I have a script.

<?php
$var = "some string"
if(isset($var)) { //Returns true, the variable is set.
  unset($var); // undoes the variable
  echo $var; //echoes nothing.
}
?>

[pcbrainbuster]

Thanks for that simple example !

[pcbrainbuster]

Is there anything else to isset function apart from checking if things are set ?

[boxxertrumps]

I dont think so.

[pcbrainbuster]

Well thanks for your help

[Twey]

It can check if a given item exists in an array, too.

[pcbrainbuster]

What do you mean ? do you mean something like isset(sesion_start()) ?

[boxxertrumps]

No he means:

<?php
$arr = array(
"key"=>"val",
"num"=>"1234",
"letter"=>"abc",
"nonalphnum"=>"!@#$"
);
if(isset($arr["num"])){
  echo "The value is set"; //echos if it is set
  echo $arr["key"]; //echos "val" 
  unset($arr["key"]);
  echo $arr["key"]; //echos nothing, because it doesnt exist.
}
?>

[pcbrainbuster]

OK thanks i see