Opcode Descriptions and Examples
PHP Manual

BW_AND

PHP code

<?php
/*
 * Bit-wise and of value1 and value2
 * opcode number: 10
 */
echo 1&2;
?>

PHP opcodes

Function name: (null)

Compiled variables: none

line#op fetchextreturn operands
60 BW_AND   ~0 1,2
 1 ECHO     ~0
72 RETURN     1

Opcode Descriptions and Examples
PHP Manual