<?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
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.
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) }
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