为什么此代码使用PHP Zend_Pdf库无法正常处理PDF上的文本？

Question

我正在尝试在服务器上动态创建PDF文档,并使用Zend_Pdf库将它们发送到客户端.PDF上的所有文本都需要与页面居中对齐,页面将是字母大小的横向.使用我在不同网站上多次发现的功能,我遇到了问题 - 中心理由是关闭的.所有文字都显得太偏左了.这是我的代码:

<?
require('Zend/Pdf.php');

$font = Zend_Pdf_Font::fontWithName(Zend_Pdf_Font::FONT_HELVETICA);
$pdf = new Zend_Pdf();

// Create a new page, add to page listing
$pdfPage = $pdf->newPage(Zend_Pdf_Page::SIZE_LETTER_LANDSCAPE);
$pdf->pages[] = $pdfPage;

// Add certify that
$pdfPage->setFont($font, 15.75);
drawCenteredText($pdfPage, "THIS IS TO CERTIFY THAT", 378);

// Add name
$pdfPage->setFont($font, 39.75);
drawCenteredText($pdfPage, "Example Name", 314.25);

// Headers
header("Content-type: application/pdf");
header("Content-Disposition: inline; filename=\"cert.pdf\"");
header('Content-Transfer-Encoding: binary');
header('Accept-Ranges: bytes');

// Output PDF
echo $pdf->render();


function drawCenteredText($page, $text, $bottom) {  
    $text_width = getTextWidth($text, $page->getFont(), $page->getFontSize());
    $box_width = $page->getWidth();
    $left = ($box_width - $text_width) / 2;

    $page->drawText($text, $left, $bottom, 'UTF-8');
}

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;
}

?>

......这就是结果.

Answer 1

如果其他人遇到类似的问题,问题在这里:

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;
}

构建字符数组时,字符加载错误 - 8位,而不是16位.

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

这解决了问题,并正确计算文本宽度.

Answer 2

尝试使用此功能:

/**
    * Return length of generated string in points
    *
    * @param string                     $text
    * @param Zend_Pdf_Resource_Font|Zend_Pdf_Page     $font
    * @param int                         $fontSize
    * @return double
*/
public static function getTextWidth($text, $resource, $fontSize = null/*, $encoding = null*/) {
    //if( $encoding == null ) $encoding = 'UTF-8';

    if( $resource instanceof Zend_Pdf_Page ){
        $font = $resource->getFont();
        $fontSize = $resource->getFontSize();
    }elseif( $resource instanceof Zend_Pdf_Resource_Font ){
        $font = $resource;
        if( $fontSize === null ) throw new Exception('The fontsize is unknown');
    }

    if( !$font instanceof Zend_Pdf_Resource_Font ){
        throw new Exception('Invalid resource passed');
    }

    $drawingText = $text;//iconv ( '', $encoding, $text );
    $characters = array ();
    for($i = 0; $i < strlen ( $drawingText ); $i ++) {
        $characters [] = ord ( $drawingText [$i] );
    }
    $glyphs = $font->glyphNumbersForCharacters ( $characters );
    $widths = $font->widthsForGlyphs ( $glyphs );

    $textWidth = (array_sum ( $widths ) / $font->getUnitsPerEm ()) * $fontSize;
    return $textWidth;
}

并在你的渲染功能上调用它,如:

if ($this->getAlign() == self::TEXT_ALIGN_CENTER)
{
        $x = ($currentPage->getWidth() - $this->getTextWidth($text, $currentPage)) / 2;
}
...
$currentPage->drawText($text, $x, $y, ...);