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:

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<?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); 
  
?> 

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Output:

Program 2:

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<?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); 
  
?>

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Output:

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




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