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(PHP 4, PHP 5, PHP 7, PHP 8)
imagecolorallocate — Allocate a color for an image
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
A GdImage object, 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.
Version | Description |
---|---|
8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
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);
?>