查看PHP的opcode

1、下载 VLD
(Vulcan Logic Dumper)的源码 svn co svn://svn.xdebug.org/svn/php/vld/trunk vld

2、cd vld

3、phppath/php/bin/phpize

4 、./configure --
  
  
  
  

   
with-php-config=phppath/bin/php-config --enable-vld

5、make && make install



至此,VLD就安装完了。写个简单的test.php

<?php
       $a='123';
       echo $a;
?>

 

php -dvld.active=1 ./test.php



会看到

Finding entry points

Branch analysis from position: 0

Return found

filename:       /home/kaisha/study/php/test.php

function name:  (null)

number of ops:  4

compiled vars:  !0 = $a

line     # *  op                           fetch          ext  return  operands

---------------------------------------------------------------------------------

   2     0  >   ASSIGN                                                   !0, '123'

   3     1      ECHO                                                     !0

   5     2    > RETURN                                                   1

         3*   > ZEND_HANDLE_EXCEPTION



branch: #  0; line:     2-    5; sop:     0; eop:     3

path #1: 0,