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    <p>Your PHP code is a C->PHP port of the <a href="http://www.sqlite.org/cvstrac/getfile/sqlite/tool/lemon.c" rel="nofollow">LEMON</a> parser generator, which includes this code:</p> <blockquote> <pre><code>/* Add another configuration to the configuration list */ struct config *Configlist_add(rp,dot) struct rule *rp; /* The rule */ int dot; /* Index into the RHS of the rule where the dot goes */ { struct config *cfp, model; assert( currentend!=0 ); model.rp = rp; model.dot = dot; cfp = Configtable_find(&amp;model); if( cfp==0 ){ cfp = newconfig(); cfp-&gt;rp = rp; cfp-&gt;dot = dot; cfp-&gt;fws = SetNew(); cfp-&gt;stp = 0; cfp-&gt;fplp = cfp-&gt;bplp = 0; cfp-&gt;next = 0; cfp-&gt;bp = 0; *currentend = cfp; currentend = &amp;cfp-&gt;next; Configtable_insert(cfp); } return cfp; } </code></pre> </blockquote> <p>It's in the PHP because it was in the original C. In the original C, it writes through the <code>currentend</code> pointer to replace the contents of whatever it is pointing at (memory allocated elsewhere, probably contains garbage), and then it updates the <code>currentend</code> pointer to point to the <code>struct node</code> pointed to by <code>cfp-&gt;next</code> (which is <code>0</code>, here, which is why I think some other routine will allocate the memory for it later).</p> <p>In other words, it appends the new <code>struct rule</code> to the end of a list of <code>struct rule</code>s while maintaining a pointer to the "last entry". (Well, an entry beyond the end. Where the next last-entry will go, once it exists. All of which makes accessing the end-of-the-list an O(1) operation, superb for improving list-append operations.)</p>
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