PHP | imagecolordeallocate() Function

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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);  
  
?> 