PHP | imagecolordeallocate() Function

The imagecolordeallocate() function is an inbuilt function in PHP which is used to de-allocate a color created by imagecolorallocate() or imagecolorallocatealpha() function for an image.

Syntax:

bool imagecolordeallocate( $image, $color )

Parameters: This function accepts two 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 the size of image.
• $color: This parameter holds the color identifier.

Return Value: This function returns True on success or False on failure.

Below programs illustrate the imagecolordeallocate() 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);

// Use imagecolordeallocate() function to
// deallocate the color
$bg = imagecolordeallocate($image_size, $bg);

// 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);

// Use imagecolordeallocate() function to
// deallocate the color
$bg = imagecolordeallocate($image_size, $bg);

// 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);

?>

Output:

Reference: https://www.php.net/manual/en/function.imagecolordeallocate.php