php loop display sum before loop that does calculation

Question

Is it possible for me to display the sum at the heading before the program runs through?

while (($data = fgetcsv($handle, 1000, ","))) {

if($data[2] != $prevRow2) {

 echo '</div>';
 if ($prevRow2 != '') {
  $stringData .= '</Payment>';
 }
 echo "<div id=\"row\">";
 echo $sum;
 $row++;
           $sum = 0;
}
 else { echo "<div id=\"filler\"></div>";}

 foreach ($data as $key => $d) {
  if ($key != 1) {
   echo "<div class=\"field\">" .$d . "</div>";
  }
 }

 $sum +=$data[6]; 
 echo "<br/>";
 echo "<div id=\"filler\"></div>"; 
                      $prevRow2 = $data[2];
} 

fclose($handle);
}

Gregor Favre · Accepted Answer · 2010-11-04 08:10:06Z

3

You could buffer the output, print out the heading with the sum after the loop ran through, and then output the buffer.

This could be accomplished simply by not echoing but assigning all the values to a variable and echoing that variable at the end - or by using the ob_start, ob_end_flush, etc functions.

So in your example, instead of:

while (true) {
  echo "lots of code";
  echo "some variable: " . $variable;
  $sum = $sum + 1;
}

Write:

while (true) {
  $output .= "lots of code";
  $output .= "some variable: " . $variable;
  $sum = $sum + 1;
}

echo $sum;
echo $output;

edited Nov 4, 2010 at 8:10

answered Nov 3, 2010 at 22:01

Gregor Favre

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2 Comments

MG1 Over a year ago

I am not able to get it working. while (($data = fgetcsv($handle, 1000, ","))) { if($data[2] != $prevRow2) { echo '</div>'; if ($prevRow2 != '') { $stringData .= '</Payment>'; } echo $sum; echo "<div id=\"row\">"; $sum=0; $row++; } else { echo "<div id=\"filler\"></div>";} if ($data[2] == $prevRow2){ $sum += $data[6]; } else {$sum=$data[6];} foreach ($data as $key => $d) { if ($key != 1) { echo "<div class=\"field\">" .$d . "</div>"; } } echo "<br/>"; echo "<div id=\"filler\"></div>"; $prevRow2 = $data[2]; }

Gregor Favre Over a year ago

Could you edit your question by formatting the code? Kinda difficult reading it in the comment. What error do you get?

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