/**
* Convert widths and heights to characters. Used before sending graphics to set the size.
*
* @param array $inputs
* @param boolean $long True to use 4 bytes, false to use 2
* @return string
*/
private static function dataHeader(array $inputs, $long = true)
{
$outp = array();
foreach ($inputs as $input) {
if ($long) {
$outp[] = Escpos::intLowHigh($input, 2);
} else {
self::validateInteger($input, 0, 255, __FUNCTION__);
$outp[] = chr($input);
}
}
return implode("", $outp);
}