ISSET_ISEMPTY_VAR
JMPNZ
Opcode Descriptions and Examples
PHP Manual

## JMP

## PHP code

`<?php
/*
* Unconditonally jump to the address
* opcode number: 42
*/
$foo = false;
while(!$foo) {
$foo = true;
}
?>`

## PHP opcodes

Function name: (null)

compiled vars: !0 = $foo

line | # | op | fetch | ext | return | operands
--- | --- | --- | --- | --- | --- | ---
6 | 0 | ASSIGN |  |  |  | !0, false
7 | 1 | BOOL_NOT |  |  | ~1 | !0
| 2 | JMPZ |  |  |  | ~1, ->5
8 | 3 | ASSIGN |  |  |  | !0, true
9 | 4 | JMP |  |  |  | ->1
11 | 5 | RETURN |  |  |  | 1