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POdefining position in an array with string
 

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    <p>I have an interesting problem... I am building an API where user specifies the location of some element in an array through string. Like this:</p> <pre><code>$path = "group1.group2.group3.element"; </code></pre> <p>Given this string, I must save some value to the correct place in an array. For the example above this would be:</p> <pre><code>$results['group1']['group2']['group3']['element'] = $value; </code></pre> <p>Of course, the code needs to be generic for whatever <code>$path</code> user throws at me. </p> <p>How would you solve this?</p> <p><strong>UPDATE - SOLUTION</strong>: using both ern0's (similar to my own) and nikc's answer as inspiration, this is the solution I decided on:</p> <pre><code>// returns reference to node in $collection as referenced by $path. For example: // $node =&amp; findnode('dir.subdir', $some_array); // In this case, $node points to $some_array['dir']['subdir']. // If you wish to create the node if it doesn't exist, set $force to true // (otherwise it throws exception if the node is not found) function &amp;findnode($path, &amp;$collection, $force = false) { $parts = explode('.', $path); $where = &amp;$collection; foreach ($parts as $part) { if (!isset($where[$part])) { if ($force) $where[$part] = array(); else throw new RuntimeException('path not found'); } $where =&amp; $where[$part]; } return $where; } $results = array(); $value = '1'; try { $bucket =&amp; findnode("group1.group2.group3.element", $results, true); } catch (Exception $e) { // no such path and $force was false } $bucket = $value; // read or write value here var_dump($results); </code></pre> <p>Thank you all for the answers, it was a nice exercise! :)</p>
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    1. COWith a `descend` function which traversing the path step by step ultimately returns a reference to the correct `node` in `collection`.
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    2. COSo, what the current 'interesting' solutions that you have come up with? And what is the problem you are facing ?
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    3. CO@nikc: could you give an example in an answer?
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