public static function Color::validateHex

public static Color::validateHex($hex)

Validates whether a hexadecimal color value is syntactically correct.

Parameters

$hex: The hexadecimal string to validate. May contain a leading '#'. May use the shorthand notation (e.g., '123' for '112233').

Return value

bool TRUE if $hex is valid or FALSE if it is not.

File

core/lib/Drupal/Component/Utility/Color.php, line 20

Class

Color

Performs color conversions.

Namespace

Drupal\Component\Utility

Code

public static function validateHex($hex) {
  // Must be a string.
  $valid = is_string($hex);
  // Hash prefix is optional.
  $hex = ltrim($hex, '#');
  // Must be either RGB or RRGGBB.
  $length = Unicode::strlen($hex);
  $valid = $valid && ($length === 3 || $length === 6);
  // Must be a valid hex value.
  $valid = $valid && ctype_xdigit($hex);
  return $valid;
}