Google charts API – PHP Goodie for calculation of extended code

If you want to use googles faboulous Chart API, and dont want to use javascript to calculate the extended code, try this useful php snippet

$EXTENDED_MAP= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-.';
$EXTENDED_MAP_LENGTH = strlen($EXTENDED_MAP);

$maxVal = 150;  //your max value

$chartData = "e:";

for($i=0; $i < (sizeof($array));$i++) {
  $scaledVal = floor($EXTENDED_MAP_LENGTH * $EXTENDED_MAP_LENGTH * $array[$i]/$maxVal);
  
  if($scaledVal > (($EXTENDED_MAP_LENGTH * $EXTENDED_MAP_LENGTH) -1)) {
    $chartData = $chartData."..";
  }
  else if($scaledVal <0 ) {
    $chartData = $chartData.'__';
  }
  else {
    $quotient = floor($scaledVal / $EXTENDED_MAP_LENGTH);
    $remainder = $scaledVal - $EXTENDED_MAP_LENGTH * $quotient;
    $chartData = $chartData.substr($EXTENDED_MAP,$quotient,1).substr($EXTENDED_MAP,$remainder,1);
  }
}