ISSET_ISEMPTY_VAR

PHP code

<?php
/*
 * Tests if the value of a variable is set or not.
 * opcode number: 114
 */
if(isset($a)){ return 0;}
?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$a

line	#	op	fetch	ext	return	operands
6	0	ZEND_ISSET_ISEMPTY_VAR		5	~0	!0
	1	JMPZ				~0,->4
	2	RETURN				0
	3	JMP				->4
7	4	RETURN				1