无法将PHP会话变量分配给PHP页面中的javascript变量

Question

I'm new to php. I learned how to access php variables in javascript but when I'm trying to iterate in 2D array which is javascript variable, I'm unable to access php session variable for comparison. Any help would be appreciated.

if(isset($_SESSION["LINK"])){
    echo "<script type='text/javascript'>
    slink = ".json_encode($_SESSION["LINK"]).";
    </script>";
    echo '<script type="text/javascript">
    var rolenumber=0;
    for(var i=0;i<roles.length;i++){
        alert(slink);
        if(roles[i][0]==slink){
            rolenumber=i;
        }
    }
    }</script>';
}

Answer 1

change

echo "<script type='text/javascript'>
slink = ".json_encode($_SESSION["LINK"]).";
</script>";

To

echo "<script type='text/javascript'>
   var slink = ".json_encode($_SESSION["LINK"]).";
</script>";

Wonder why would you want it to be inside php? why don't you just use

<script type="text/javascript">
   var rolenumber=0;
   var slink = <?php echo json_encode($_SESSION["LINK"]); ?>
    for(var i=0;i<roles.length;i++){
        alert(slink);
        if(roles[i][0]==slink){
           rolenumber=i;
        }
     }
   }
</script>