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POHow to format an associative array with another structure?
 

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  1. POHow to format an associative array with another structure?
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    <p>I have a query like this:</p> <pre><code>select truck, oil_type, km_min, km_max from trucks; </code></pre> <p>I'm using codeigniter and with the <code>$query-&gt;result_array()</code> function so its loaded in an associative array with this structure:</p> <pre><code>/* array( truck oil_type km_min km_max ) */ $arr[0]["truck"] = 2; $arr[0]["oil_type"] = 2; $arr[0]["km_min"] = 345; $arr[0]["km_max"] = 567; $arr[1]["truck"] = 2; $arr[1]["oil_type"] = 4; $arr[1]["km_min"] = 234; $arr[1]["km_max"] = 867; $arr[2]["truck"] = 1; $arr[2]["oil_type"] = 2; $arr[2]["km_min"] = 545; $arr[2]["km_max"] = 867; $arr[3]["truck"] = 4; $arr[3]["oil_type"] = 3; $arr[3]["km_min"] = 45; $arr[3]["km_max"] = 567; </code></pre> <p>Then, I'm trying to restructure it grouping the trucks by the id, something like this:</p> <pre><code>/* trucks - array( truck truck_data - array( oil_type km_min km_max ) ) */ $arr["truck"][0]= 2; $arr["truck"][0]["truck_data"][0]["oil_type"] = 2; $arr["truck"][0]["truck_data"][0]["km_min"] = 345; $arr["truck"][0]["truck_data"][0]["km_max"] = 567; $arr["truck"][0]["truck_data"][1]["oil_type"] = 4; $arr["truck"][0]["truck_data"][1]["km_min"] = 234; $arr["truck"][0]["truck_data"][1]["km_max"] = 867; $arr["truck"][1]= 1; $arr["truck"][1]["truck_data"][0]["oil_type"] = 2; $arr["truck"][1]["truck_data"][0]["km_min"] = 545; $arr["truck"][1]["truck_data"][0]["km_max"] = 867; $arr["truck"][2]= 4; $arr["truck"][2]["truck_data"][0]["oil_type"] = 3; $arr["truck"][2]["truck_data"][0]["km_min"] = 45; $arr["truck"][2]["truck_data"][0]["km_max"] = 567; </code></pre> <p>I thought in something like the code below:</p> <pre><code>$res = $query-&gt;result_array(); $cnt_total = count($res); $y = 0; for ($x=0; $x &lt; $cnt_total -1 ; $x++) { $truck = $res[$x]["truck"]; $trucks["truck"][$y] = $truck; $q = $x + 1; $i = 0; do{ $trucks[$y][$i]["oil_type"] = $res[$q]["oil_type"]; $trucks[$y][$i]["km_min"] = $res[$q]["km_max"]; $trucks[$y][$i]["km_max"] = $res[$q]["km_max"]; $q++; $i++; if ($q &lt;= $cnt_total) break; } while ( $truck === $res["truck"][$q] ); $y++; } </code></pre> <p>But does not work properly... I'm too far of the solution? The performance It's important for me in this particular case.</p> <p>There is a phpfiddle where you can try: <strong><a href="http://phpfiddle.org/main/code/67j-ui5" rel="nofollow">http://phpfiddle.org/main/code/67j-ui5</a></strong></p> <p>Any idea, tip, or advice will be appreciated, and if you need more info, let me know and I'll edit the post.</p>
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