function Color::rgbToHex
Same name in other branches
- 9 core/lib/Drupal/Component/Utility/Color.php \Drupal\Component\Utility\Color::rgbToHex()
- 8.9.x core/lib/Drupal/Component/Utility/Color.php \Drupal\Component\Utility\Color::rgbToHex()
- 10 core/lib/Drupal/Component/Utility/Color.php \Drupal\Component\Utility\Color::rgbToHex()
Converts RGB color arrays or strings to lowercase CSS notation.
Parameters
array|string $input: The value to convert. If the value is an array the first three elements will be used as the red, green and blue components. String values in CSS notation like '10, 20, 30' are also supported.
Return value
string The lowercase simple color representation of the given color.
3 calls to Color::rgbToHex()
- Color::validateColor in core/
lib/ Drupal/ Core/ Render/ Element/ Color.php - Form element validation handler for #type 'color'.
- ColorTest::testRgbToHex in core/
tests/ Drupal/ Tests/ Component/ Utility/ ColorTest.php - Tests Color::rgbToHex().
- GDToolkit::getTransparentColor in core/
modules/ system/ src/ Plugin/ ImageToolkit/ GDToolkit.php - Gets the color set for transparency in GIF images.
File
-
core/
lib/ Drupal/ Component/ Utility/ Color.php, line 71
Class
- Color
- Performs color conversions.
Namespace
Drupal\Component\UtilityCode
public static function rgbToHex($input) {
// Remove named array keys if input comes from Color::hex2rgb().
if (is_array($input)) {
$rgb = array_values($input);
}
elseif (is_string($input)) {
preg_match('/(\\d+), ?(\\d+), ?(\\d+)/', $input, $rgb);
array_shift($rgb);
}
$out = 0;
foreach ($rgb as $k => $v) {
$out |= $v << 16 - $k * 8;
}
return '#' . str_pad(dechex($out), 6, '0', STR_PAD_LEFT);
}
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