The imagecolorallocate() function is an inbuilt function in PHP which is used to set the color in an image. This function returns a color which is given in RGB format.
Syntax:
int imagecolorallocate ( $image, $red, $green, $blue )
Parameters: This function accepts four parameters as mentioned above and described below:
- $image: It is returned by one of the image creation functions, such as imagecreatetruecolor(). It is used to create size of image.
- $red: This parameter is used to set value of red color component.
- $green: This parameter is used to set value of green color component.
- $blue: This parameter is used to set value of blue color component.
Return Value: This function returns a color identifier on success or FALSE if the color allocation failed.
Below programs illustrate the imagecolorallocate() function in PHP.
Program 1:
<?php   // It create the size of image or blank image. $image_size = imagecreatetruecolor(500, 300);   // Set the background color of image using // imagecolorallocate() function. $bg = imagecolorallocate($image_size, 0, 103, 0);   // Fill background with above selected color. imagefill($image_size, 0, 0, $bg);   // output image in the browser header("Content-type: image/png"); imagepng($image_size);   // free memory imagedestroy($image_size);   ?> |
Output:
Program 2:
<?php   // It create the size of image or blank image. $image_size = imagecreatetruecolor(500, 300);   // Set the background color of image. $bg = imagecolorallocate($image_size, 0, 103, 0);   // Fill background with above selected color. imagefill($image_size, 0, 0, $bg);   // Set the colors of image $white_color = imagecolorallocate($image_size, 255, 255, 255);   // Draw a circle imagearc($image_size, 200, 150, 200, 200, 0, 360, $white_color); // output image in the browser header("Content-type: image/png"); imagepng($image_size);   // free memory imagedestroy($image_size);   ?> |
Output:
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Reference: http://php.net/manual/en/function.imagecolorallocate.php
