Internals2/opcodes/fetch-r-Phpdoc专题
FETCH_R
PHP code
<?php
/*
* Fetch the value of the varible of "name" to assign it to a variable? Read-only?
* opcode number: 80
*/
$x = 1;
$a = 'x';
echo $$a;
?>PHP opcodes
Function name: (null)
Compiled variables: !0=$x, !1=$a
| line | # | op | fetch | ext | return | operands |
|---|---|---|---|---|---|---|
| 6 | 0 | ASSIGN | !0,1 | |||
| 7 | 1 | ASSIGN | !1,'x' | |||
| 8 | 2 | FETCH_R | local | $2 | !1 | |
| 3 | ECHO | $2 | ||||
| 9 | 4 | RETURN | 1 |