PHP是一种通用开源脚本语言。语法吸收了C语言、Java和Perl的特点，利于学习，使用广泛，主要适用于Web开发领域。PHP 独特的语法混合了C、Java、Perl以及PHP自创的语法。它可以比CGI或者Perl更快速地执行动态网页。近日发布了三个更新版本，这三个版本主要都是安全方面的更新，详细改进记录如下：
Version 7.1.28
04 Apr 2019
EXIF:
Fixed bug #77753 (Heap-buffer-overflow in php_ifd_get32s).
Fixed bug #77831 (Heap-buffer-overflow in exif_iif_add_value).
SQLite3:
Added sqlite3.defensive INI directive.
Version 7.3.4
04 Apr 2019
Core:
Fixed bug #77738 (Nullptr deref in zend_compile_expr).
Fixed bug #77660 (Segmentation fault on break 2147483648).
Fixed bug #77652 (Anonymous classes can lose their interface information).
Fixed bug #77345 (Stack Overflow caused by circular reference in garbage collection).
Fixed bug #76956 (Wrong value for 'syslog.filter' documented in php.ini).
Apache2Handler:
Fixed bug #77648 (BOM in sapi/apache2handler/php_functions.c).
Bcmath:
Fixed bug #77742 (bcpow() implementation related to gcc compiler optimization).
CLI Server:
Fixed bug #77722 (Incorrect IP set to $_SERVER['REMOTE_ADDR'] on the localhost).
COM:
Fixed bug #77578 (Crash when php unload).
EXIF:
Fixed bug #77753 (Heap-buffer-overflow in php_ifd_get32s).
Fixed bug #77831 (Heap-buffer-overflow in exif_iif_add_value).
FPM:
Fixed bug #77677 (FPM fails to build on AIX due to missing WCOREDUMP).
GD:
Fixed bug #77700 (Writing truecolor images as GIF ignores interlace flag).
MySQLi:
Fixed bug #77597 (mysqli_fetch_field hangs scripts).
Opcache:
Fixed bug #77743 (Incorrect pi node insertion for jmpznz with identical successors).
PCRE:
Fixed bug #76127 (preg_split does not raise an error on invalid UTF-8).
Phar:
Fixed bug #77697 (Crash on Big_Endian platform).
phpdbg:
Fixed bug #77767 (phpdbg break cmd aliases listed in help do not match actual aliases).
sodium:
Fixed bug #77646 (sign_detached() strings not terminated).
SQLite3:
Added sqlite3.defensive INI directive.
Standard:
Fixed bug #77664 (Segmentation fault when using undefined constant in custom wrapper).
Fixed bug #77669 (Crash in extract() when overwriting extracted array).
Fixed bug #76717 (var_export() does not create a parsable value for PHP_INT_MIN).
Fixed bug #77765 (FTP stream wrapper should set the directory as executable).
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