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#opfetchextreturnoperands
60ZEND_ISSET_ISEMPTY_VAR 5~0!0
 1JMPZ   ~0,->4
 2RETURN   0
 3JMP   ->4
74RETURN   1