How to get opcodes of PHP?
opcode, php
Solution
Check out the Vulcan Logic Disassembler PECL extension - see author's home page for more info.
The Vulcan Logic Disassembler hooks into the Zend Engine and dumps all the opcodes (execution units) of a script. It was written as as a beginning of an encoder, but I never got the time for that. It can be used to see what is going on in the Zend Engine.
Once installed, you can use it like this:
php -d vld.active=1 -d vld.execute=0 -f yourscript.php
See also this interesting blog post on opcode extraction, and the PHP manual page listing the available opcodes.
Problem
``` <?php $show_value = 123; echo 'sing_quote'.$show_value; echo "double_quote{$show_value}"; ?> ``` Its opcode is: ``` 1: <?php 2: $show_value = 123; 0 ASSIGN !0, 123 3: echo 'sing_quote'.$show_value; 1 CONCAT 'sing_quote', !0 =>RES[~1] 2 ECHO ~1 4: echo "double_quote{$show_value}"; 3 ADD_STRING 'double_quote' =>RES[~2] 4 ADD_VAR ~2, !0 =>RES[~2] 5 ECHO ~2 6 RETURN 1 ```