Why is this code to center text on a PDF using the PHP Zend_Pdf Library not working?

Question

I\'m attempting to dynamically create PDF documents on the server and send them to the client using the Zend_Pdf library. All text on the PDF needs to be center aligned to the p

Answer 1

In case anyone else runs into a similar problem, the issue is here:

function getTextWidth($text, $font, $font_size) {
    $drawing_text = iconv('', 'UTF-8', $text);
    $characters    = array();
    for ($i = 0; $i < strlen($drawing_text); $i++) {
        $characters[] = (ord($drawing_text[$i++]) << 8) | ord ($drawing_text[$i]);
    }
    $glyphs        = $font->glyphNumbersForCharacters($characters);
    $widths        = $font->widthsForGlyphs($glyphs);
    $text_width   = (array_sum($widths) / $font->getUnitsPerEm()) * $font_size;
    return $text_width;
}

When building the characters array, the characters are being loaded incorrectly - 8 bits, not 16.

$characters[] = ord ($drawing_text[$i]);

This solves the problem, and correctly calculates text width.