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<?php
/**
* Imagecolorallocatefromstring v1.0.1
*
* Copyright (c) 2018 Andrew G. Johnson <andrew@andrewgjohnson.com>
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in the
* Software without restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
* Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* PHP version 5
*
* @category Andrewgjohnson
* @package Imagecolorallocatefromstring
* @author Andrew G. Johnson <andrew@andrewgjohnson.com>
* @copyright 2018 Andrew G. Johnson <andrew@andrewgjohnson.com>
* @license https://opensource.org/licenses/mit/ The MIT License
* @link https://github.com/andrewgjohnson/imagecolorallocatefromstring
*/
if (!function_exists('imagecolorallocatefromstring')) {
/**
* Imagecolorallocatefromstring is a function that will allocate a color based
* on a string for your PHP GD images.
*
* @param resource $image <p>An image resource, returned by one of the image
* creation functions, such as imagecreatetruecolor().</p>
* @param int $string <p>A string containing the color.</p>
* @param int $alpha <p>A value between 0 and 127. 0 indicates completely
* opaque while 127 indicates completely transparent. Default is zero.</p>
*
* @throws InvalidArgumentException if the $string parameter is invalid
*
* @return mixed Returns a color identifier or FALSE if the allocation failed.
*/
function imagecolorallocatefromstring(
$image,
$string,
$alpha = 0
) {
if (preg_match('/^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/', $string)) {
$string = trim($string);
$string = ltrim($string, '#');
if (strlen($string) === 3) {
$firstCharacter = substr($string, 0, 1);
$secondCharacter = substr($string, 1, 1);
$thirdCharacter = substr($string, 2, 1);
$string = $firstCharacter . $firstCharacter;
$string .= $secondCharacter . $secondCharacter;
$string .= $thirdCharacter . $thirdCharacter;
}
$red = hexdec(substr($string, 0, 2));
$green = hexdec(substr($string, 2, 2));
$blue = hexdec(substr($string, 4, 2));
if ($alpha > 0) {
return imagecolorallocatealpha($image, $red, $green, $blue, $alpha);
} else {
return imagecolorallocate($image, $red, $green, $blue);
}
} else {
$exceptionText = 'imagecolorallocatefromstring function received an ';
$exceptionText .= 'invalid value for $string, input was: ' . $string;
if (class_exists('InvalidArgumentException')) {
throw new InvalidArgumentException($exceptionText);
} else {
throw new Exception($exceptionText);
}
}
}
}