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    copied!<p>I'm not sure I understand the nesting in your example, as the example doesn't demonstrate a purpose behind nesting. Your example input could very easily be</p> <pre><code>'This is my test {@a} {@b} string.' </code></pre> <p>And using arrays in str_replace would handle this very simply and quickly.</p> <pre><code>$aVars = array('{@a}' =&gt; 'hello', '{@b}' =&gt; 'world'); $sString = 'This is my test {@a} {@b} string.'; echo str_replace(array_keys($aVars), array_values($aVars), $sString); </code></pre> <p>Which gives us</p> <blockquote> <p>This is my test hello world string.</p> </blockquote> <p>Now, a recursive function for this isn't too difficult, though I'm not sure I understand how useful it would be. Here's a working example:</p> <pre><code>function template($sText, $aVars) { if (preg_match_all('/({@([^{}]+)})/', $sText, $aMatches, PREG_SET_ORDER)) { foreach($aMatches as $aMatch) { echo '&lt;pre&gt;' . print_r($aMatches, 1) . '&lt;/pre&gt;'; if (array_key_exists($aMatch[2], $aVars)) { // replace the guy inside $sText = str_replace($aMatch[1], $aVars[$aMatch[2]], $sText); // now run through the text again since we have new variables $sText = template($sText, $aVars); } } } return $sText; } </code></pre> <p>That print_r will show you what the matches look like so you can follow the function through its paces. Now lets try it out...</p> <pre><code>$aVars = array('a' =&gt; 'hello', 'b' =&gt; 'world'); $sStringOne = 'This is my test {@a} {@b} string.'; $sStringTwo = 'This is my test {@a{@b}} string.'; echo template($sStringOne, $aVars) . '&lt;br /&gt;'; </code></pre> <p>First Result:</p> <blockquote> <p>This is my test hello world string.</p> </blockquote> <p>Now lets try String Two</p> <pre><code>echo template($sStringTwo, $aVars) . '&lt;br /&gt;'; </code></pre> <p>Second Result:</p> <blockquote> <p>This is my test {@aworld} string.</p> </blockquote> <p>That may very well be what you're looking for. Obviously you would need an <code>aworld</code> variable for this to work recursively...</p> <pre><code>$aVars = array('a' =&gt; '', 'b' =&gt; '2', 'a2' =&gt; 'hello world'); echo template($sStringTwo, $aVars) . '&lt;br /&gt;'; </code></pre> <p>And our result.</p> <blockquote> <p>This is my test hello world string.</p> </blockquote> <p>And just for some fun with the recursion...</p> <pre><code>$aVars = array('a3' =&gt; 'hello world', 'b2' =&gt; '3', 'c1' =&gt; '2', 'd' =&gt; '1'); $sStringTre = 'This is my test {@a{@b{@c{@d}}}} string.'; echo template($sStringTre, $aVars) . '&lt;br /&gt;'; </code></pre> <blockquote> <p>This is my test hello world string.</p> </blockquote> <p>Not sure if this is what you're asking for...</p>
 

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