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    <p>You should probably take a look at this answer first <a href="https://stackoverflow.com/questions/9200966/sql-array-search/9201135#9201135">SQL Array Search</a> (how to store such an information in the database). If you still want to use coma separated list, the best way is probably using <a href="http://php.net/manual/en/function.explode.php" rel="nofollow noreferrer"><code>explode()</code></a>, <a href="http://php.net/manual/en/function.array-map.php" rel="nofollow noreferrer"><code>array_map()</code></a> and <a href="http://php.net/manual/en/function.implode.php" rel="nofollow noreferrer"><code>implode()</code></a>:</p> <pre class="lang-php prettyprint-override"><code>function generateLink( $tag){ $tag = htmlspecialchars( trim( $tag)); $str = "&lt;a href=\"/tags/$tag\"&gt;$tag&lt;/a&gt;"; } $tags = explode( ',', $row['tags']); $new_tags = array_map( 'generateLink', $tags); echo implode( ', ', $new_tags); // Of course you can chain it to: echo implode( ', ', array_map( 'generateLink', explode( ',', $row['tags']))); </code></pre> <p>However if you use correct database design you should this <code>SELECT</code> (displaying one product):</p> <pre class="lang-sql prettyprint-override"><code>SELECT tags.name FROM tags_products INNER JOIN tags ON tags_products.tag_id = tags.id WHERE tags_products,product_id = ? </code></pre> <p>And with php:</p> <pre class="lang-php prettyprint-override"><code>$q = $db-&gt;query( 'mentioned select'); $result = array(); while( $row = $q-&gt;fetch_assoc()){ $result[] = genereateLink( $row['name']); } </code></pre> <p>And in case of mass listing of product to increase performance use this select with <a href="http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat" rel="nofollow noreferrer"><code>GROUP_CONCAT</code></a>:</p> <pre class="lang-sql prettyprint-override"><code>SELECT products.id, products.name, GROUP_CONCAT(tags.name ASC SEPARATOR ', ') AS tags FROM products LEFT JOIN tags_products ON tags_producsts.product_id = products.id INNER JOIN tags ON tags_products.tag_id = tags.id GROUP BY products.id </code></pre> <p>And apply the first mentioned code on <code>$row['tags']</code> :)</p>
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    1. POPHP Separate comma list with links
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    1. CO@Kaii if you have tutorial on how to design such a table I'll be glad to add it... I have troubles finding it in English.
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    2. COAppreciate all comments - the reason why I went with this approach is I did not want another table called tags associated with products. So I made it in a single row. Thanks for all comments. Repped
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    3. CO@TheBlackBenzKid when your database grows and/or you want to add features (like, say.. search by tag) you will run into performance problems with that approach. we warned you ;)
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