12 使用 imagebrick 进行 pdf 到图像的转换

function change()
{
　　$pdf_file = './pdf/demo.pdf';
　　$save_to = './jpg/demo.jpg'; //make sure that apache has permissions to write in this folder! (common problem)//execute ImageMagick command 　　'convert' and convert PDF to JPG with applied settings
　　exec('convert "' . $pdf_file . '" -colorspace RGB -resize 800 "' . $save_to . '"', $output, $return_var);
　　if ($return_var == 0) { //if exec successfuly converted pdf to jpg
　　　　print "Conversion OK";
　　} else{
　　　　print "Conversion failed.<br />" . $output;
　　}
}