PHP 5.6.20 发布了，该版本修复了如下 Bug：
CLI Server:
Fixed bug #69953 (Support MKCALENDAR request method).
Core:
Fixed bug #71596 (Segmentation fault on ZTS with date function (setlocale)).
Curl:
Fixed bug #71694 (Support constant CURLM_ADDED_ALREADY).
Date:
Fixed bug #71635 (DatePeriod::getEndDate segfault).
Fileinfo:
Fixed bug #71527 (Buffer over-write in finfo_open with malformed magic file).
Mbstring:
Fixed bug #71906 (AddressSanitizer: negative-size-param (-1) in mbfl_strcut).
ODBC:
Fixed bug #47803, #69526 (Executing prepared statements is succesfull only for the first two statements).
Fixed bug #71860 (Invalid memory write in phar on filename with \0 in name).
PDO_DBlib:
Fixed bug #54648 (PDO::MSSQL forces format of datetime fields).
Phar:
Fixed bug #71625 (Crash in php7.dll with bad phar filename).
Fixed bug #71504 (Parsing of tar file with duplicate filenames causes memory leak).
SNMP:
Fixed bug #71704 (php_snmp_error() Format String Vulnerability).
Standard:
Fixed bug #71798 (Integer Overflow in php_raw_url_encode).
