如何在PHP中使用ImageMagick显示图像序列

Question

for($i = 0; $i < 2; $i++) {
    $im = new imagick('fileuploads/filename.pdf['.$i.']');
    $im->setImageFormat('jpg');
    header('Content-Type: image/jpeg');
    echo $im;
}

The above code displays only the first page of the PDF file.

Answer 1

HTTP allows only one resource per url so when visits your preview url he can only see one image like http://example.com/a.jpg would open only a.jpg it cannot open b.jpg at the same time.so your only option is to create a big image and copy the pdf pages you want to show in the preview.I am not sure but you may try the code below

$startPage  = 0; // from where to start
$countPages = 1; // how many pages

$pdf = '/pdf/mypdf.pdf[' . $startPage .'-'. $countPages . ']';

$image = new Imagick($pdf);
$image->resizeImage( 400, (($countPages-$startPage)+1)*400, imagick::FILTER_LANCZOS, 0);
$image->setImageFormat( "jpg" );

header('Content-Type: image/jpeg');
echo $im;