fetch-dim-r-Phpdoc专题

FETCH_DIM_R

PHP code

<?php
/*
 * Fetch the value of the element at "index" in "array-value" to store it in "result".  Read-only?
 * opcode number: 81
 */
$x = array(1,2,3);
$a = 'x';
echo $$a[0];
?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$x, !1=$a

line	#	op	fetch	return	operands
6	0	INIT_ARRAY		~0	1
	1	ADD_ARRAY_ELEMENT		~0	2
	2	ADD_ARRAY_ELEMENT		~0	3
	3	ASSIGN			!0,~0
7	4	ASSIGN			!1,'x'
8	5	FETCH_DIM_R		$3	!1,0
	6	FETCH_R	local	$4	$3
	7	ECHO			$4
9	8	RETURN			1