. Implemented FR #55467 (phpinfo: PHP Variables with $ and single quotes). (Kalle)
. Fixed bug #55415 (php_info produces invalid anchor names). (Kalle, Johannes)
. Added ?? operator. (Andrea)
+ . Added <=> operator. (Andrea)
. Added \u{xxxxx} Unicode Codepoint Escape Syntax. (Andrea)
. Fixed oversight where define() did not support arrays yet const syntax did. (Andrea, Dmitry)
. Use "integer" and "float" instead of "long" and "double" in ZPP, type hint and conversion error messages. (Andrea)
. Added \u{xxxxxx} Unicode Codepoint Escape Syntax for double-quoted strings
and heredocs.
. define() now supports arrays as constant values, fixing an oversight where define() did not support arrays yet const syntax did.
+ . Added the comparison operator (<=>), aka the spaceship operator.
+ (RFC: https://wiki.php.net/rfc/combined-comparison-operator)
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3. Changes in SAPI modules