php利用微信小程序实现pdf文件的预览功能

wget https://netix.dl.sourceforge.net/project/imagemagick/im7-src/ImageMagick-7.0.7-25.tar.gz
tar -zxvf ImageMagick-7.0.7-25.tar.gz
cd ImageMagick-7.0.7-25
./configure
make && make install

wget https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs925/ghostscript-9.25.tar.gz
tar zxvf ghostscript-9.25.tar.gz
cd ghostscript-9.25
./configure --prefix=/usr
make && make install

echo "/usr/local/lib" >> /etc/ld.so.conf 
ldconfig

try{
    $url = !empty($_GET['url']) ? $_GET['url'] : die('error');
    $page = isset($_GET['p']) ? $_GET['p']-1 : '0';
    $file_name = 'temp_' . mt_rand(1000,9999) . 'pdf';
    file_put_contents( './'.$file_name,file_get_contents($url));
    $imagePreview = new imagick('./'. $file_name . '['.$page.']');
    $imagePreview->setImageFormat( "jpg" );
    // $imagePreview->setResolution( 900, 900 );
    header( "Content-Type: image/jpeg" );
    echo $imagePreview;
    unlink('./'. $file_name);
}catch(\Exception $e){
    echo '发生错误';
}