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首先下载最新版vld扩展：
<div class="codetitle"><a style="CURSOR: pointer" data="854" class="copybut" id="copybut854" onclick="doCopy('code854')"> 代码如下:<div class="codebody" id="code854">
~/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：
<div class="codetitle"><a style="CURSOR: pointer" data="92568" class="copybut" id="copybut92568" onclick="doCopy('code92568')"> 代码如下:<div class="codebody" id="code92568">
~/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：
<div class="codetitle"><a style="CURSOR: pointer" data="70541" class="copybut" id="copybut70541" onclick="doCopy('code70541')"> 代码如下:<div class="codebody" id="code70541">
~/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：
<div class="codetitle"><a style="CURSOR: pointer" data="10062" class="copybut" id="copybut10062" onclick="doCopy('code10062')"> 代码如下:<div class="codebody" id="code10062">
extension=vld.so
接下来创建test.php文件：
<div class="codetitle"><a style="CURSOR: pointer" data="91500" class="copybut" id="copybut91500" onclick="doCopy('code91500')"> 代码如下:<div class="codebody" id="code91500">
<?php
$a = "hello world";
echo $a . PHP_EOL;
使用cli来执行，查看生成的opcode：
<div class="codetitle"><a style="CURSOR: pointer" data="73746" class="copybut" id="copybut73746" onclick="doCopy('code73746')"> 代码如下:<div class="codebody" id="code73746">
~/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
（编辑：李大同）
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