[String] Add a method to strip emojis from strings

[javiereguiluz]

Description

In #48396 we added an option to remove emojis from slugs:

use Symfony\Component\String\Slugger\AsciiSlugger;

$slugger = new AsciiSlugger();
$slugger = $slugger->withEmoji('strip');

$slug = $slugger->slug('a 😺, 🐈‍⬛, and a 🦁');

I'd like to have this feature for strings too, not only slugs.

Example

use function Symfony\Component\String\u;

$string = u('😺 Lorem ipsum 🐈‍⬛ dolor sit amet 🦁')->stripEmojis()->toString();
// $string = ' Lorem ipsum  dolor sit amet '

[derrabus]

How's the result in your example (a-and-a) different from what the slugger would produce?

[javiereguiluz]

@derrabus sorry! It was a copy+paste mistake. I've just updated the above example.

[derrabus]

Thanks. Makes much more sense now. 😅

[nicolas-grekas]

You can use the EmojiTransliterator for that.

[fancyweb]

I agree a shortcut method would still be useful, something like:

public function stripEmojis(): static
{
    if (null === (self::$transliterators['emoji-strip'] ?? null)) {
        if (!class_exists(EmojiTransliterator::class)) {
            throw new \LogicException(sprintf('You cannot use the "%s()" method as the "symfony/intl" package is not installed. Try running "composer require symfony/intl".', __METHOD__));
        }

        self::$transliterators['emoji-strip'] = EmojiTransliterator::create('emoji-strip');
    }

    $str = clone $this;
    $str->string = self::$transliterators['emoji-strip']->transliterate($str->string);

    return $str;
}