Internals2/opcodes/unset-var-Phpdoc专题
UNSET_VAR
PHP code
<?php
/*
* Unset the variable and store the original value into "result".
* opcode number: 74
*/
$x = 1;
$a='x';
unset($$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 | UNSET_VAR | $2 | !1 | ||
| 9 | 3 | RETURN | 1 |