PHP Manual: PRE_DEC

PRE_DEC_OBJ


<?php
/*
 * 
 * opcode number: 133
 */
$obj = new A();
--$obj->num;
?>

Function name: (null)

Compiled variables: !0=$obj

line	#	op	ext	return	operands
6	0	ZEND_FETCH_CLASS		:0	'A'
	1	NEW		$1	:0
	2	DO_FCALL_BY_NAME	0
	3	ASSIGN			!0,$1
7	4	ZEND_PRE_DEC_OBJ			!0,'num'
8	5	RETURN			1