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POare php references a good idea when handling large or many arrays?
 

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  1. POare php references a good idea when handling large or many arrays?
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    <p>Finally I have something to ask the community</p> <p>My case: I have some box-like objects with internal arrays, I wish to manipulate these arrays inside methods, but a donating box must result empty after a merging operation. I'm currently using references so as to not copy large arrays, but I just recently came across a great post: <a href="http://schlueters.de/blog/archives/125-Do-not-use-PHP-references.html" rel="nofollow" title="post">do not use php references</a>.</p> <pre><code>class Box implements MadeUpArrayLikeInterfaces { protected $v = array(); ... public function __clone() { foreach ($this-&gt;v as &amp;$v) {// correct the mess left behind the cloning process? if (is_object($v)) $v = clone $v;// perhaps I shouldn't deep clone anything? } } public function merge() { $boxes = func_get_args();// variable argument list arary_unshift($boxes,$this-&gt;v); array_walk(array($this,'walkUnwrap'),$boxes);// prepare input, allow only arrays $this-&gt;v = call_user_func('array_merge',array_filter($boxes));// merge } public function import(self $box) {// edited to make more sense $this-&gt;v = array_merge($this-&gt;v,$box-&gt;v);// do the merge $box-&gt;v = array(); } public function export() { $e = array(); // empty array that may be referenced $r =&amp; $this-&gt;v; // avoid copying for return $this-&gt;v =&amp; $e; // point to empty because assignment would erase $r as well return $r; // return contents } private static function walkUnwrap(&amp;$v) {// walks on argument list if ($v instanceof self &amp;&amp; $v-&gt;v) {// if element is Box, export it $e = array(); $o = $v; // save reference to the Box $v =&amp; $v-&gt;v;// pass the data $o-&gt;v =&amp; $e;// this box should now be empty } elseif (!is_array($v)) $v = null;// if it's anything but array get rid of it } } </code></pre> <p>So now I'm wondering if my approach is actually correct. Are these operations "writes" as stipulated in the post and therefore it's better to use references? are these copy-values?</p> <p>Thank you all</p> <p>edited: indeed I have been careless, the import function is much simpler, and I have a better function that also use references that could be useful in showing what this is about</p>
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