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PHP 7.3

Released 6 December 2018.

Major new features:

flexible heredoc and nowdoc syntax (closing marker may be indented)

Minor new features:

reference assignment in list(), eg. [&$a, &$b] = $arr

JSON_THROW_ON_ERROR flag for json_decode()/json_encode()

array_key_first() and array_key_last()

is_countable()