Example of setting color using imagecolorallocate() function in PHP image processing, imagecolorallocate_PHP tutorial

An example of using the imagecolorallocate() function to set colors in PHP image processing, imagecolorallocate

While using PHP to dynamically output beautiful images, it is also inseparable from color settings, just like you need to use a palette when painting. To set the color of an image, you need to call the imagecolorallocate() function. If you need to set multiple colors in the image, just call this function multiple times. The prototype of this function looks like this:

This function returns an identifier that represents the color composed of the given RGB components. The parameters $red, $green and $blue are the red, green and blue components of the required color respectively. These parameters are integers from 0 to 255 or hexadecimal from 0x00 to 0xFF. The first parameter $image is the handle of the canvas image. This function must call the color in the image represented by $image. But be aware that if the canvas is created using the imagecreate() function, the first call to the imagecolorallocate() function will fill the background color with the image based on the palette. The usage code of this function is as follows: