Classes/Utility/ContentElementUtility.php
public static function contentElementSignature(string $extensionIdentifier, string $contentElementIdentifier): string {
    $contentElementSignature = mb_strtolower($extensionIdentifier . '_' . $contentElementIdentifier);

    return $contentElementSignature;
  }
public static function contentElementSignature(string $extensionIdentifier, string $contentElementIdentifier): string {
    $contentElementSignature = mb_strtolower($extensionIdentifier . '_' . $contentElementIdentifier);

    return $contentElementSignature;
  }
Gets a content element signature from an extension and content element identifier.

@param string $extensionIdentifier The extension identifier
@param string $contentElementIdentifier The content element identifier
@return string The content element signature