PHP Manual: Destroy an image

bool imagedestroy(GdImage $image)

Note:
This function has no effect. Prior to PHP 8.0.0, this function was used to close the resource.

Prior to PHP 8.0.0, imagedestroy freed any memory associated with image image.

image: A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.

Returns true on success or false on failure.

Version	Description
8.0.0	This function is a NOP now.
8.0.0	`image` expects a GdImage instance now; previously, a valid `gd` resource was expected.

Example #1 Using imagedestroy prior to PHP 8.0.0

<?php
// create a 100 x 100 image
$im = imagecreatetruecolor(100, 100);

// alter or save the image

// frees image from memory
imagedestroy($im);
?>