public static function 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.

2 calls to Color::rgbToHex()
ColorTest::testRgbToHex in drupal/core/modules/system/lib/Drupal/system/Tests/Common/ColorTest.php
Tests Color::rgbToHex().
form_validate_color in drupal/core/includes/form.inc
Form element validation handler for #type 'color'.

File

drupal/core/lib/Drupal/Core/Utility/Color.php, line 83
Definition of Drupal\Core\Utility\Color.

Class

Color
Performs color conversions.

Namespace

Drupal\Core\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);
}