The RFC proposes to deprecate the listed functionality in PHP 7.4 and remove it in PHP 8.
Deprecate (real) cast and is_real() function?
Deprecate get_magic_quotes_gpc() and get_magic_quotes_runtime()?
Deprecate array_key_exists() with objects?
Deprecate FILTER_SANITIZE_MAGIC_QUOTES?
Deprecate Reflection export() methods?
Deprecate mb_strrpos() with encoding as 3rd argument?
Deprecate implode() with inverted parameter order?
Deprecate unbinding of $this from non-static closures?
Deprecate hebrevc() function?
Deprecate convert_cyr_string() function?
Deprecate money_format() function?
Deprecate ezmlm_hash() function?
Deprecate restore_include_path() function?
Deprecate allow_url_include ini option?