How to get opcodes of PHP?

Question

  <?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

Answer 1

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.

Answer 2

Parsekit has parsekit_compile_string().

sudo pecl install parsekit

var_dump(parsekit_compile_string(<<<PHP
 \$show_value   = 123;
 echo 'sing_quote'.\$show_value;
 echo "double_quote{\$show_value}";
PHP
));

The output is quite verbose, so you'd need to process it to get assembler-like format.

  ["opcodes"]=>
  array(10) {
    [0]=>
    array(9) {
      ["address"]=>
      int(44682716)
      ["opcode"]=>
      int(101)
      ["opcode_name"]=>
      string(13) "ZEND_EXT_STMT"
      ["flags"]=>
      int(4294967295)
      ["result"]=>
      array(8) {
        ["type"]=>
        int(8)
        ["type_name"]=>
        string(9) "IS_UNUSED"
        ["var"]=>
        int(0)
        ["opline_num"]=>
        string(1) "0"
        ["op_array"]=>
        string(1) "0"
        ["jmp_addr"]=>
        string(1) "0"
        ["jmp_offset"]=>
        string(8) "35419039"
        ["EA.type"]=>
        int(0)
      }
      ["op1"]=>
      array(8) {
        ["type"]=>
        int(8)
        ["type_name"]=>
        string(9) "IS_UNUSED"
        ["var"]=>
        int(0)
        ["opline_num"]=>
        string(1) "0"
        ["op_array"]=>
        string(1) "0"
        ["jmp_addr"]=>
        string(1) "0"
        ["jmp_offset"]=>
        string(8) "35419039"
        ["EA.type"]=>
        int(0)
      }