- PHP 手册
- PHP 核心：骇客指南
- Zend Engine 2 操作码列表
- Opcode Descriptions and Examples
FETCH_CONSTANT
PHP code
<?php
/*
* Fetch the constant value bound to the specified name (name) and stores it into a variable (result).
* opcode number: 99
*/
define("FOO", "something");
echo FOO;
?>
PHP opcodes
Function name: (null)
Compiled variables: none
| line | # | op | fetch | ext | return | operands |
|---|---|---|---|---|---|---|
| 6 | 0 | SEND_VAL | 'FOO' | |||
| 1 | SEND_VAL | 'something' | ||||
| 2 | DO_FCALL | 2 | 'define' | |||
| 7 | 3 | FETCH_CONSTANT | ~1 | 'FOO' | ||
| 4 | ECHO | ~1 | ||||
| 8 | 5 | RETURN | 1 |
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/internals2.opcodes.fetch-constant.php