GD Functions in PHP for managing graphics
By using PHP and GD library support we can develop powerful graphics scripts which can handle many types of image manipulation and development. In new version of GD and PHP support we can develop even FLASH images and animations.
We have to ensure that the support for all these graphics capabilities are available in our server and if not available then how to add them. We will learn all these along with script development here. First we will start with how to enable GD support in your server.
Learn how to check GD support availability at server and how to enable it at php.ini file.
To display images we have to have tell browser by header that we are sending one image and not a html page.
The first step to draw line chart or graphs is to draw lines of different length and reading the coordinates. We can change the gallery background or canvas colour also.
Draw Sin, Cos curve and then add both to draw a single image.
We can collect data from mysql table and plot a line graph by using this data. The image with the graph can have labels and data display on it.
How to add vertical grid to the ling graph drawn by taking data from a mysql table?
How to add border to an uploaded image by using gd support in PHP? WE can change the width of the border also.
We can add watermark images present in a directory or just uploaded by using GD support. The watermark can be added on the fly to the image while uploading.
Generate Captcha for user to read the text and enter in a form. The text is generated as image by using GD functions.
User can enter name and grade through a form and submit. With this data and using a template, certificate can be generated by adding text to the image using ImageString().
Using a standard template we can add data from MySQL table to generate certificates on the fly.
Along with the student data taken from MySQL table, we can add student photo, Logo and QR code while generating the certificates.
Generate a graphical page hit counter.
What is PHP GD, and what is its purpose?
How can you check if GD support is enabled in your PHP installation?
What are some commonly used GD functions in PHP?
How do you create a new image using GD functions in PHP?
How can you resize an image using GD functions?
What is the difference between
How can you draw a rectangle on an image using GD functions?
How do you add text to an image using GD functions?
How can you apply image filters like grayscale or sepia using GD functions?
How do you save an image created or modified using GD functions to a file?
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