Opcode Descriptions and Examples
PHP Manual

BW_OR

PHP code

<?php
/*
 * Bit-wise or of value1 and value2
 * opcode number: 9
 */
echo 1|2;
?>

PHP opcodes

Function name: (null)

Compiled variables: none

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

Opcode Descriptions and Examples
PHP Manual