allowing just friends to comments in their profile page - php

Question

i have a profile page that contain a comment system and i just allow the owner of the profile to write their comments now i want to allow friends also to write how to do that ???
in the members table i have a friend_array field that contain the ids of users that are friend with this user
the friend request system include ajax and jquery
code.php
$blab_form="";
if(isset($_SESSION['user_id']))
{
if($_SESSION['user_id']==$id)
{
$blab_form='
'.$blab_output_msg.'<br />
<div style="background-color:#D2F0D3;border:#999 1px solid; padding:8px;">
<form action="profile.php" method="post" enctype="multipart/form-data" name="blab_form">
<textarea name="blab_field" cols="" rows="4" style="width:100%;">
</textarea><br />
(220 Char Max)
<input type="submit" name="submit" value="Blab"/>
</form></div>';
//$sql = mysql_query("DELETE FROM blabing WHERE u_id ='$id'")or die(mysql_error());
}
}
friend_request_system
<?php
//****************friend request system********************//
// for securing the request with and encryption to be more secure.
if(isset($_SESSION['wpit']))
{
$_SESSION['wipt'];
}
$theRundomNum = rand(99999999999999,9999999999999);
$_SESSION['wipt'] = base64_encode($theRundomNum);
//*********for distinguich the users*************//
//if member is a viewer
$friendLink = "";
if(isset($_SESSION['user_id'])&&$_SESSION['user_id']!=$id)
{
//for quering friend array for the viewer if he is not the owner
$sqlArray = mysql_query("SELECT friend_array FROM members WHERE user_id ='".$_SESSION['user_id']."' LIMIT 1")or die(mysql_error());
while($row = mysql_fetch_array($sqlArray))
{
$iFriendArray = $row['friend_array'];
}
$iFriendArray = explode("," , $iFriendArray);
if(in_array($id, $iFriendArray))
{
$friendLink = 'Remove Friend';
}
else
{
$friendLink = 'Add as Friend';
}
$interactionBox='<div class="interactionLinksDiv">
'.$friendLink.'
</div>';
}
//if member is the profile ower
else
{
$interactionBox = '<div class="interactionLinksDiv">
Freind Request List </div>';
}
?>

Answer 1

if($_SESSION['user_id']==$id) is specific to the blog owner, right? So you make this conditional check if the session id is in an array of acceptable id's. Something like this:
// assuming you already populated the $iFriendArray as outlined in your question
$iFriendArray[] = $id; // add blog owner to the friend array
if(in_array($_SESSION['user_id'], $iFriendArray))
{
// can comment
}
This has been updated to use the friend array as updated in your question.
Any questions feel free to ask and I may update.