public static Unicode::strtolower($text)
Converts a UTF-8 string to lowercase.
string $text: The string to run the operation on.
string The string in lowercase.
public static function strtolower($text) { if (static::getStatus() == static::STATUS_MULTIBYTE) { return mb_strtolower($text); } else { // Use C-locale for ASCII-only lowercase. $text = strtolower($text); // Case flip Latin-1 accented letters. $text = preg_replace_callback('/\xC3[\x80-\x96\x98-\x9E]/', '\Drupal\Component\Utility\Unicode::caseFlip', $text); return $text; } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Component!Utility!Unicode.php/function/Unicode::strtolower/8.1.x