etl - Reformat a table with Year Month Day Columns so that each date is a Column Heading in PHP -


suppose have associative array in php tabular data looks following:

kpiname     year    month   day kpicount aead10d-lrz 2014    7       30  29 aead10d-lrz 2014    7       31  40 aead10d-lrz 2014    8       1   49 aead10d-lrz 2014    8       2   34 aead10d-lrz 2014    8       3   32 aead10d-lrz 2014    8       4   30 aead10d-lrz 2014    8       5   30 aead20d-lrz 2014    7       30  25 aead20d-lrz 2014    7       31  31 aead20d-lrz 2014    8       1   47 aead20d-lrz 2014    8       2   17 aead20d-lrz 2014    8       3   12 aead20d-lrz 2014    8       4   37 aead20d-lrz 2014    8       5   30

what performant way reformat following data structure:

kpiname     2014-07-30  2014-07-31  2014-08-01  2014-08-02  2014-08-03  2014-08-04  2014-08-05 aead10d-lrz 29          40          49          34          32          30          30 aead20d-lrz 25          31          47          17          12          37          30

there multiple ways this, here 1 way.

// associative array $data = array( array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>7, "day"=>30, "kpicount"=>29), array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>7, "day"=>31, "kpicount"=>40), array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>8, "day"=>1, "kpicount"=>49), array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>8, "day"=>2, "kpicount"=>34), array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>8, "day"=>3, "kpicount"=>32), array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>8, "day"=>4, "kpicount"=>30), array("kpiname"=>"aead10d-lrz", "year"=>2014, "month"=>8, "day"=>5, "kpicount"=>30), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>7, "day"=>30, "kpicount"=>25), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>7, "day"=>31, "kpicount"=>31), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>8, "day"=>1, "kpicount"=>47), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>8, "day"=>2, "kpicount"=>17), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>8, "day"=>3, "kpicount"=>12), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>8, "day"=>4, "kpicount"=>37), array("kpiname"=>"aead20d-lrz", "year"=>2014, "month"=>8, "day"=>5, "kpicount"=>30), );  // array hold reordered array $newdata = array();  // reorder array $newdata, grouped kpiname data key foreach($data $row){     $newdata[$row["kpiname"]][$row["year"]."-".$row["month"]."-".$row["day"]]=$row["kpicount"];  }  // date keys use headers $headers = array_keys(reset($newdata));  // build table echo "<table><tr>"; echo "<td>kpiname</td>"; // loop through date headers foreach($headers $header){     echo "<td>{$header}</td>"; } echo "</tr>";  // loop through each kpiname row foreach($newdata $key=>$row){     echo "<tr>";     echo "<td>{$key}</td>";      // loop through each date value     foreach($row $data){         echo "<td>{$data}</td>";     }     echo "</tr>"; } echo "</table>";

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