Please check out the tutorial on regular expressions to learn the regular expressions in details. ), for example, it allows the file names such as kites.jpg or Kites.jpg, but do not allow kites.jpg. The regular expression in the above example ( line no-8) will simply not allow those files whose name starts or ends with a dot character (. Similarly, you can force download other files formats like word doc, pdf files, etc. Here's the complete code of "download.php" file, which force image download. Also, we've used PHP urlencode() function to encode the image file names so that it can be safely passed as URL parameter, because file names may contain URL unsafe characters. Which method would you prefer? Have any suggestions for further improvements? Feel free to mention them in the comments.If you see the above example code carefully, you'll find the download link pints to a "download.php" file, the URL also contains image file name as a query string. I hope you have learned something new from this post. So this is how you create a preview for a given PDF document. The choice of one over the other is merely based on your own taste. I am not sure if that is because of some optimization issues, but the difference is not of that big concern. However, with the same set of configurations, Ghostscript produced smaller image files than the ones rendered by ImageMagick. A command line in programming does not look that good and sometimes becomes notorious to understand. Well, I found the ImageMagick one pretty consistent with the PHP code. Some of you might be wondering why to use this method over the previous one. The PDF page you want to render is mentioned as an array index after the file name. We are defining an instance of Imagick type and setting various parameters like resolution, file format, etc. Here’s the standard documentation for a quick overview. It is available for majority of mainstream programming languages, including PHP. ImageMagick: It is a free and open-source software suite for displaying, converting, and editing raster image and vector image files.You can read more about it on its official site. Windows, Linux and Mac, that interprets PostSript and PDF files. Ghostscript: It is a command line utility available for all three major platforms, viz.The methods that I found appealing in this scenario are based on the following tools: Now implementing the complete conversion algorithm from scratch is not feasible, so we will stick to the 3rd party libraries to ease our task. Where do you think you can use this concept into your project? Do let me know in the comments. Well, one may need it for his library management system, her online e-book retail store or just for some insane weekend programming challenge. I'm guessing ImageMagick is the best way to do this, however I can't seem to figure out how to combine the files. In this post, however, we will limit ourselves to a much smaller example, that is to generate an image preview from a given PDF document. I'm trying to take a series of JPG's and combine them into one PDF file with each JPG being it's own page. The images may also come in handy when you need some ready-made slides for your quick office presentations or for embedding them into your reports and blogs. As the content from images cannot be copied that easily, the conversion makes the document strictly ‘read-only’ and brings an extra layer of protection from plagiarism. How to Upload Image into Database and Display it using PHP ?Ĭonverting a PDF document into a set of images may not sound that fun, but it can have a few applications.
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