public static function Color::rgbToHex in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Component/Utility/Color.php \Drupal\Component\Utility\Color::rgbToHex()

Converts RGB color arrays and RGB strings in CSS notation to lowercase simple colors like '#aabbcc'.

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 72

Class

Color

Performs color conversions.

Namespace

Drupal\Component\Utility

Code

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);
}