PHP Manual: FETCH_FUNC

FETCH_FUNC_ARG


<?php
/*
 * 
 * opcode number: 92
 */
function foo($x)
{
}

$x = 1;
$y = "x";
$z = "foo";

$z($$y);

?>

Function name: (null)

Compiled variables: !0=$x, !1=$y, !2=$z

line	#	op	fetch	ext	return	operands
6	0	NOP
10	1	ASSIGN				!0,1
11	2	ASSIGN				!1,'x'
12	3	ASSIGN				!2,'foo'
14	4	INIT_FCALL_BY_NAME				!2
	5	FETCH_FUNC_ARG	local		$3	!1
	6	SEND_VAR				$3
	7	DO_FCALL_BY_NAME		1
16	8	RETURN				1

Function name: foo

Compiled variables: !0=$x

line	#	op	fetch	ext	return	operands
6	0	RECV				1
8	1	RETURN				null