INSTANCEOF

PHP code

<?php
/*
 * 
 * opcode number: 138
 */
$obj = new A();

if ($obj instanceof A) {
   echo 'A';
}
?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$obj

line	#	op	fetch	ext	return	operands
6	0	ZEND_FETCH_CLASS			:0	'A'
	1	NEW			$1	:0
	2	DO_FCALL_BY_NAME		0
	3	ASSIGN				!0,$1
8	4	ZEND_FETCH_CLASS			:4	'A'
	5	ZEND_INSTANCEOF			~5	!0,$4
	6	JMPZ				~5,->9
9	7	ECHO				'A'
10	8	JMP				->9
11	9	RETURN				1