Question

The variable looks like this:

$keywords = 'key1, key2, key3, key4';

How can i create links like:

<a href="../tag/key1">key1</a>, <a href="../tag/key2">key2</a>, <a href="../tag/key3">key3</a>, <a href="../tag/key4">key4</a>

using php?

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// Edited

What if $is defined with

$keywords = 'key1, keyword two, key3, key four';

or even other order?

<a href="../tag/key1">key1</a>, <a href="../tag/keyword+two">keyword two</a>, <a href="../tag/key3">key3</a>, <a href="../tag/key+four">key four</a>

i mean, if one of the ‘keyword’ it is formed from two words add a ‘+’ sign between them at the link

How can this been done?

Answer 1

Try this out:

foreach(explode(', ',$keywords) as $value){
    echo "<a href='../tag/$value'>$value</a>";
}

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To do with commas:

$keyArray = explode(', ',$keywords);
$keyLength = count($keyArray);
foreach($keyArray as $key=>$value){
    echo "<a href='../tag/$value'>$value</a>";
    if($key < ($keyLength - 1)){
          echo ", ";
    }
}

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UPDATE TO OP:

$keyArray = explode(', ',$keywords);
$keyLength = count($keyArray);
foreach($keyArray as $key=>$value){
    echo "<a href='../tag/";
    $vArr = explode(' ', $value);
    $vLength = count($vArr);
    foreach($vArr as $kv=>$v){
         echo $v;
         if($kv < ($vLength - 1))  echo "+";
    }
    echo "'>$value</a>";
    if($key < ($keyLength - 1)){
          echo ", ";
    }
}