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index 03d8d68186..f6b54d4233 100644
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+++ b/UPGRADING
@@ -35,6 +35,9 @@ PHP 7.2 UPGRADE NOTES
/^(0|(-?[1-9][0-9]*))$/ where PHP_INT_MIN <= n <= PHP_INT_MAX) to integer
keys. This fixes the behaviour of previous versions, where numeric string
property names would become inaccessible string keys.
+ . Unqualified references to undefined constants now generate a Warning instead
+ of a notice. They will generate an Error in a future version of PHP.
+ (https://wiki.php.net/rfc/deprecate-bareword-strings)
. Minimum supported Windows versions are Windows 7/Server 2008 R2.
- BCMath: