Merge branch 'PHP-5.6' into PHP-7.0

diff --cc NEWS
index d7a956990f4811033f7ef6f543b2f7fc6ef979b6,7a0e89086922287837d93b2f86959e60eae593f6..3fe60ff8eae2b244305778c5804052b76aeab4a8
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -61,14 -44,11 +61,16 @@@ PH
  - mbstring:
    . Fixed bug #72691 (mb_ereg_search raises a warning if a match zero-width).
      (cmb)
+   . Fixed Bug #72693 (mb_ereg_search increments search position when a match
+     zero-width). (cmb)
  
 +- Opcache:
 +  . Fixed bug #72590 (Opcache restart with kill_all_lockers does not work).
 +    (Keyur)
 +
  - PCRE:
    . Fixed bug #72688 (preg_match missing group names in matches). (cmb)
 +  . Upgraded to PCRE 8.39. (Anatol)
  
  - PDO_pgsql:
    . Fixed bug #70313 (PDO statement fails to throw exception). (Matteo)

diff --cc ext/mbstring/php_mbregex.c
Simple merge