Delete every session apart from two

[stuckwithcode]

Hello, I have many session variables and instead of unsetting them all I want to know if there is some code to remove all current sessions apart from a couple of them.

 

Cheers

[Adam]

You mean remove all current session variables apart from two..?

 

$save = array('var1', 'var2');

foreach ($_SESSION as $name => $value)
{
    if (!in_array($name, $save))
    {
        unset($_SESSION[$name]);
    }
}

[stuckwithcode]

hello that works well thank you, could you explain it a bit though what does the arrow mean.

 

cheers

 

 

[Anti-Moronic]

Hi, I'll explain a little but your best bet is to checkout the manual for how foreach loops are constructed.

 

As you should know, every array has a key and a value. See this array:

 

$something['key1'] = 'val1';

 

is the same as..

 

$something = array('key1' => 'val1');

 

Common foreach loop is:

 

foreach($something as $val){

}

 

 

That feeds the loop the $val for each element of the array. But then we come across the common need for using the $key of an array. So now our foreach uses the pointer in the same fashoin it did in the array() example above.

 

foreach($something as $key => $val){

}

 

 

The confusion here is that the $val is now no longer straight after the 'as' keyword. It is preceded by $key =>

 

I'm not entirely sure of the correct term for this => but it is somekind of array pointer. There is another pointer -> which is used for objects.

[Adam]

foreach ($array as $key => $val) is the same syntax as when you define an array with keys:

 

$array = array(

    'key' => 'val'

);

 

"=>" is just an (array) assignment operator specific to PHP. As far as I know the only other popular language that uses it is PL/SQL from the Oracle platform, for naming parameters in procedure/function calls.