如何用“，”符号分隔字符串的各个部分

Question

UPDATE FOR JAY'S ANSWER :

I did what you've done in this link :

public function ShowTag()
    {
        $blog_tags = array();
        $tag = $this->_db->prepare("SELECT blog_tags FROM blogs");
        $tag->execute();
        while($row = $tag->fetch())
        {
            $blog_tags[] = $row['blog_tags'];
        }
        $final_anchors = "";
        $final_tags = "";
        foreach($blog_tags as $b)
        {
            $make_comma_seprated_tags_to_array = explode(",",$b);
            $final_tags = array_merge($final_tags,$make_comma_seprated_tags_to_array);
        }
        foreach($final_tags as $f)
        {
            $final_anchors .= '<a href="'.$f.'">'.$f."</a>";
        }
        return $final_anchors;
    }

But it gives me these errors:

Warning: array_merge(): Argument #1 is not an array

$final_tags = array_merge($final_tags,$make_comma_seprated_tags_to_array);

Warning: Invalid argument supplied for foreach()

foreach($final_tags as $f)

===========================================================================

I'm working with PHP to develop my project. Basically I have a table called Blogs which contains some information about blog posts of my site:

capture

Now I have created a page where all the tags of blog posts are shown there. So in order to do that, I coded this:

if(!empty($tags)){
    print_r($tagShow);
    $string = implode(',',$tagShow);
    echo $string;
}else{
    echo "There is no tag available right now!";
}

As you can see I'm referring to $tagShow which is basically this method:

public function ShowTag()
{
    $blog_tags = array();
    $tag = $this->_db->prepare("SELECT blog_tags FROM blogs");
    $tag->execute();
    while($row = $tag->fetch())
    {
        $blog_tags[] = $row['blog_tags'];
    }
    return $blog_tags;
}

And it returns an array like this:

Array ( [0] => asdsadsa,hello [1] => new,old ) 

That's why I've used implode function to convert this into string:

asdsadsa,hello ,new,old

Now what I want to do is to separate each tag by , sign. Therefore I can put a hyperlink on any of them...

So if you know how to do this, please help me out.

Thanks in advance.

Answer 1

public function ShowTag()
{
    $blog_tags = array();
    $tag = $this->_db->prepare("SELECT blog_tags FROM blogs");
    $tag->execute();
    while($row = $tag->fetch())
    {
        $tags = explode(",",$row['blog_tags']);
        $blog_tags=array_merge($blog_tags,$tags);

    }
    // $blog_tags have now all tags
   $final_anchors="";
    foreach($blog_tags as $b)
    {
     $final_anchors.='<a href="BASIC_URL'.$b.'">#'.$b."</a>";
    }
    return $final_anchors;
}

/ We can also imporve code by nested for loop but basics idea will be same /

http://sandbox.onlinephpfunctions.com/code/5670bf4019292d9cd06402c2fddeed17da9f7449 Check this link for demo

Answer 2

You initiated $final_tags as string. It must be like this:

$final_tags = [];