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You can also do this 
<pre><code id="code-20-42089362-1">$db2 = &quot;productf_{$supplier['db']}&quot;;</code></pre>
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EDIT<br />
Your question is confusing - you have mixed &quot;&nbsp;and '<br />
It looks like your opening question is asking to produce this output<br />
<br />
productf_'somevalue'<br />
<br />
I am guessing this is not the case
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You can also do this

$db2 = "productf_{$supplier['db']}";


EDIT
Your question is confusing - you have mixed " and '
It looks like your opening question is asking to produce this output

productf_'somevalue'

I am guessing this is not the case

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For anyone coming to this question in the future, <a href="https://www.experts-exchange.com/articles/12241/Quotation-Marks-in-PHP.html" rel="ugc">E-E has an article explaining how PHP handles quotes and apostrophes</a>.
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For anyone coming to this question in the future, E-E has an article explaining how PHP handles quotes and apostrophes [https://www.experts-exchange.com/articles/12241/Quotation-Marks-in-PHP.html].

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I am getting an error on this line. &nbsp;How do I fix? &nbsp;I have tried several variations.<br />
<br />

<pre><code id="code-10-29015616-1">$db2     = &quot;productf_' . $supplier['db'] . '&quot;;</code></pre>
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I am getting an error on this line.  How do I fix?  I have tried several variations.

(CODE)

How do use '  ' within this code?

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.