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    <p>My only suggestion would be this one</p> <pre><code>&lt;table&gt; &lt;tr&gt; &lt;td&gt;a&lt;/td&gt; &lt;td&gt;b&lt;/td&gt; &lt;td&gt;c&lt;/td&gt; &lt;td&gt;d&lt;/td&gt; &lt;/tr&gt; &lt;?php $fhdrop2 = fopen("rc.csv", "r"); while (!feof($fhdrop2) ) { $at2[] = fgetcsv($fhdrop2, 1024); } $fhdrop = fopen("ac.csv", "r"); while (!feof($fhdrop) ){ $at = fgetcsv($fhdrop, 1024); ?&gt; &lt;tr&gt; &lt;td&gt;&lt;?php echo $at[0]; ?&gt;&lt;/td&gt; &lt;td&gt;&lt;?php echo $at[1]; ?&gt;&lt;/td&gt; &lt;td&gt;&lt;?php echo number_format($at[1]*$at2[0][1],2); ?&gt;&lt;/td&gt; &lt;td&gt;&lt;?php echo number_format($at[1]*$at2[1][1],2); ?&gt;&lt;/td&gt; &lt;/tr&gt; &lt;?php } ?&gt; &lt;/table&gt; </code></pre> <p>This should not optimize in speed but it should save some memory for bigger ac.csv files, because you do not need to create a big array. But i do not think you could optimize speed here. I hope someone can provide a better answer.</p> <p><strong>EDIT #01</strong> Here is little more flexible loop</p> <pre><code>&lt;tr&gt; &lt;td&gt;&lt;?php echo $at[0] ?&gt;&lt;/td&gt; &lt;td&gt;&lt;?php echo $at[1] ?&gt;&lt;/td&gt; &lt;?php for($i = 0; $i &lt; sizeof($at2); $i++){ ?&gt; &lt;td&gt;&lt;?php echo number_format($at[1]*$at2[$i][1],2) ?&gt;&lt;/td&gt; &lt;?php } ?&gt; &lt;/tr&gt; </code></pre> <p>With this one your rc.csv can store more than 2 Values to multiply. Not an speed or memory optimization but you will save code and time if you try to scale your functions/loops. </p> <p><strong>EDIT #02</strong> I tried scrowler's approach and would suggest this one because of the logic/mark-up separation. The side effects are more use of Memory and a slightly slower script speed but it isn't significant (the speed). </p> <p>Hope this will help</p>
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    1. COSimple, and works. So you get the bounty!
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