session_cache_limiter and session_cache_expire help cheers

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advance thank you.

 

why dosent the id exspire please cheers.

 

<?php

$id="003";

session_cache_limiter('id');

$limiter=session_cache_limiter();

session_cache_expire(01);

session_start();

if(isset($limiter)){

echo "id is set";

}else{

echo" id has expire";
}
?>