PHP（外文名:PHP: Hypertext Preprocessor，中文名：“超文本预处理器”）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。

用PHP做出的动态页面与其他的编程语言相比，PHP是将程序嵌入到HTML（标准通用标记语言下的一个应用）文档中去执行，执行效率比完全生成HTML标记的CGI要高许多；PHP还可以执行编译后代码，编译可以达到加密和优化代码运行，使代码运行更快。

PHP 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).

Version 7.2.17

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 #77676 (Unable to run tests when building shared extension on AIX).
• Bcmath:
  • Fixed bug #77742 (bcpow() implementation related to gcc compiler optimization).
• COM:
  • Fixed bug #77578 (Crash when php unload).
• Date:
  • Fixed bug #50020 (DateInterval:createDateFromString() silently fails).
  • Fixed bug #75113 (Added DatePeriod::getRecurrences() method).
• 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 #77691 (Opcache passes wrong value for inline array push assignments).
  • Fixed bug #77743 (Incorrect pi node insertion for jmpznz with identical successors).
• 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).

更新日志：https://www.php.net/ChangeLog-7.php

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