Scaling images in PHP is quite easy, but there are some things to consider. (If you're short of time, right at the end you'll find the final script.) Read the original image with imagecreatefromjpegFirst of all you'll need to read the original image. If it's a JPEG file the imagecreatefromjpeg function is the right choice:$sourceimage = imagecreatefromjpeg('osaka.jpg');If it's a GIF file you'll take imagecreatefromgif, and if it's a PNG you will prefer imagecreatefrompng.For this small tutorial I'll use from the. Get the size of the original image: getimagesize vs. Imagesx and imagesyReading the image is quite easy, but the first pitfall you'll encounter if you prepare to scale an image, and need to find out the dimensions of the original image.Most tutorials will propose this way:$sourceimage = imagecreatefromjpeg('osaka.jpg');$sourceimagesize = getimagesize('osaka.jpg');The problem with the getimagesize function is that it needs to reopen the file to get the actual image size. This is usually not a big issue if you're reading a local file, but it will get critical if you're reading a file from the network like in:$sourceimage = imagecreatefromjpeg('= getimagesize('time you call getimagesize the whole image file get transferred over the network, and that quickly became mission-critical.
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Since you already have the image loaded with imagecreatefromjpeg there is no need to load it again:$sourceimage = imagecreatefromjpeg('osaka.jpg');$sourceimagex = imagesx($sourceimage);$sourceimagey = imagesy($sourceimage); Create the destination image: imagecreate vs. ImagecreatetruecolorNow we need to prepare the (scaled) destination image.
There are two PHP functions which can be used to create an image: imagecreate and imagecreatetruecolor.
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The getimagesize function in PHP is an inbuilt function which is used to get the size of an image.
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