(PHP 4, PHP 5, PHP 7)
imagecolorallocate — Allocate a color for an image
imagecolorallocate ( resource $image , int $red , int $green , int $blue ) : int
Returns a color identifier representing the color composed of the given RGB components.
imagecolorallocate() must be called to create each color that is to be used in the image represented by image
.
Note:
The first call to imagecolorallocate() fills the background color in palette-based images - images created using imagecreate().
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red
Value of red component.
green
Value of green component.
blue
Value of blue component.
A color identifier or false
if the allocation failed.
This function may return Boolean false
, but may also return a non-Boolean value which evaluates to false
. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.
Example #1 imagecolorallocate() example
<?php $im = imagecreate(100, 100); // sets background to red $background = imagecolorallocate($im, 255, 0, 0); // sets some colors $white = imagecolorallocate($im, 255, 255, 255); $black = imagecolorallocate($im, 0, 0, 0); // hexadecimal way $white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF); $black = imagecolorallocate($im, 0x00, 0x00, 0x00); ?>
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https://www.php.net/manual/en/function.imagecolorallocate.php