[Sync EN] intval: expand example with a variety of bases (#5827)

[github-actions]

Commit: https://github.com/php/doc-en/commit/81a581c15721591f9fdd3e36990d8b729236689d
PR: https://github.com/php/doc-en/pull/5827

Fichiers FR à mettre à jour

• reference/var/functions/intval.xml