利用PHP扩展vld查看PHP opcode操作步骤

首先下载最新版vld扩展：

~/public_html/php-5.3.13/ext> wget http://pecl.php.net/get/vld-0.11.2.tgz
~/public_html/php-5.3.13/ext> tar zxvf vld-0.11.2.tgz
~/public_html/php-5.3.13/ext> cd vld-0.11.2/

接下来编译安装vld扩展：

~/public_html/php-5.3.13/ext/vld-0.11.2> phpize
~/public_html/php-5.3.13/ext/vld-0.11.2> ./configure --with-php-config=/usr/local/services/php/bin/php-config --enable-vld
~/public_html/php-5.3.13/ext/vld-0.11.2> make
~/public_html/php-5.3.13/ext/vld-0.11.2> sudo make install
installing shared extensions: /usr/local/services/php/lib/php/extensions/no-debug-non-zts-20090626/

最后将生成的vld.so复制到extension_dir目录下：

~/public_html/php-5.3.13/ext/vld-0.11.2> cd /usr/local/services/php/lib/php/extensions/no-debug-non-zts-20090626/
/usr/local/services/php/lib/php/extensions/no-debug-non-zts-20090626> sudo cp vld.so /usr/local/services/php/extensions/

然后修改php.ini文件，添加如下配置：

extension=vld.so

接下来创建test.php文件：

<?php
$a = "hello world";
echo $a . php_eol;

使用cli来执行，查看生成的opcode：

~/public_html> php -dvld.active=1 test.php
finding entry points
branch analysis from position: 0
return found
filename: /home/zhanhailiang/public_html/test.php
function name: (null)
number of ops: 4
compiled vars: !0 = $a
line # * op fetch ext return operands
---------------------------------------------------------------------------------
3 0 > assign !0, 'hello+world'
5 1 concat ~1 !0, '%0a'
2 echo ~1
6 3 > return 1
branch: # 0; line: 3- 6; sop: 0; eop: 3
path #1: 0,
hello world