This takes 3 parameters the new width, new height and the resize option, this will allow us to resize the image to exact dimensions, use the defined width with the height and keep aspect ratio, use the define height keeping the aspect ratio or let the class decide the best way of resizing the image. The resize function is what we will use to calculate the new values for the image width and height.
$this->origHeight = imagesy($this->image) $this->origWidth = imagesx($this->image) Throw new Exception("File is not an image, please use another file type.", 1) $this->image = imagecreatefromjpeg($filename) * Set the image variable by using image create This will allow us to resize the image easier later in the script. We can then use this with the functions imagesx and imagesy to return the current width and height of the image. The set image method is used to create a image resource based on the image given to the class this uses the PHP functions imagecreatefromjpeg, imagecreatefromgif, imagecreatefrompng to create the image resource from the given image. ' can not be found, try another image.') * string $filename - Filename of the image you want to resize * Class constructor requires to send through the image filename This will then check if the file exists on the server, if it does then we can call the set image method where we can get the image and create a resource of the image and store this in a class variable. Because of this we should pass the image filename into the constructor of the class.
This class relies on an original image being found and set on the class, without this the class will not work correctly.
#Html resize image download
We need to pass an existing image to the class, this is the image that we will use to resize.Class Methodsįirst lets plan out the class we are going to create: When the class has resized the image you can either save the image on the server or download the image. In this tutorial we are going to create a PHP class that will allow you to resize an image to any dimension you want, it will allow you to resize while keeping the aspect ratio of the image.
#Html resize image full
This means that the image will still need to be downloaded at full size, if the image is very large it can take some time for you to download a large image just to be displayed in a small space.Ī better solution would be to resize the image to 100px x 100px which will reduce it's size so that the browser doesn't need to download a large image just to display it in a small space. This will work perfectly fine and the image will fit in the 100px x 100px space but the problem is that when the browser loads the image it will not resize the image but will just display it in the limited size. One option is to just set the width and height attributes on the image tag in your HTML, this will force the image to be displayed at this size. If you have a very large image and you are going to place it on your website in a space that is only 100px x 100px then you will want to be able to resize this image to fit in the space. A common feature that you will come across in websites is the ability to resize an image to fit an exact size so that it will be displayed correctly on your design.
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