imagecolorallocate
(PHP 4, PHP 5, PHP 7)
imagecolorallocate — Allocate a color for an image
Description
int imagecolorallocate ( resource $image , int $red , int $green , int $blue )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().
Parameters
`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.
These parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.
Return Values
A color identifier or FALSE if the allocation failed.
Warning
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.
Changelog
Version | Description |
|---|---|
5.1.3 | Returns FALSE if the allocation failed. Previously -1 was returned. |
Examples
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);
?>See Also
- imagecolorallocatealpha() - Allocate a color for an image
- imagecolordeallocate() - De-allocate a color for an image
← imagecharup
imagecolorallocatealpha →
© 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
本文档系腾讯云开发者社区成员共同维护，如有问题请联系 cloudcommunity@tencent.com
