If statement in Shortcode to display different content based of Atts

Question

So i have a shortcode called [ kerrigan ] and I want to have 3 atts where when used each one will display different content for the shortcode so for example [ kerrigan link="true" ] it shows a certain return, when I use [ kerrigan icon="true" ] it shows a different return same for [ kerrigan image="true" ] than I would like to have just [ kerrigan ] have it's own content to return also. So pretty much have it output something different depending on what I put in there as the atts

add_shortcode('kerrigan', 'kerring');
function kerrigan( $atts, $content = null )
{
array(
    'link'  => 'true',
    'icon'  => 'true',
    'image' => 'true',
    );

if($link == 'true'){
    return 'display content 1';
}

if($icon == 'true'){
    return 'display content 2';
}

if($image == 'true'){
    return 'display content 3';
}

}

I'm still learning PHP so my if statment syntax I"m sure are a bit off.

Answer 1

if($link = 'true'){

}

should be

if($link == 'true'){
}

And so on for others !!

= is for assignment 

== is for comarison.

Answer 2

function kerring($atts)
{
    if(is_array($atts)){
        foreach($atts as $key=>$value){
            switch ($key){
                case 'link': if($value == 'true') return 'content for link';
                case 'icon': if($value == 'true') return 'content for icon';
                case 'image': if($value == 'true') return 'content for image';
                default: return 'some default content for other atts';
            }
        }
    }
    return 'content without atts';
}

add_shortcode('kerrigan', 'kerring');

added array check, it works, but i think its a misuse of foreach statement, another aproach would be extracting $atts as variables

function kerring($atts)
{
    extract($atts);

    if(isset($link)){
        if($link=='true'){
            return 'content for link';
        }
    }

    if(isset($icon)){
        if($icon=='true'){
            return 'content for icon';
        }
    }

    if(isset($image)){
        if($image=='true'){
            return 'content for image';
        }
    }

    return 'content without atts';
}

add_shortcode('kerrigan', 'kerring');