* 'PHP-5.6' of git.php.net:php-src:
Update NEWS
Fixed bug #68370 ("unset($this)" can make the program crash)
Fix opcache.revalidate_freq per-request behavior
Partial fix for bug #68365 (zend_mm_heap corrupted after memory overflow in zend_hash_copy)
Fixed bug #68351 (PDO::PARAM_BOOL and ATTR_EMULATE_PREPARES misbehaving)