在 php 中初始化常量

Question

我已将这些代码放入我的 php 文件中。我收到一些错误，例如

使用未定义常量 To - 假定 'To' 使用未定义常量 To - 假定 'Message' 等

如何声明常量？

$sendsms =""; //initialise the sendsms variable
$param[To] = "0123456";
$param[Message] = "testmsg";
$param[UserName] = "user";
$param[Password] = "pwd";
$param[Mask] = "TTNERD";
$param[v] = "1.1"; 
$param[Type] = "Individual"

Answer 1

将这些数组键用引号引起来：

$param[To] becomes $param['To']

Answer 2

引用你的数组键

$param['To'] = "0123456";
$param['Message'] = "testmsg";
$param['UserName'] = "user";
$param['Password'] = "pwd";
$param['Mask'] = "TTNERD";
$param['v'] = "1.1"; 
$param['Type'] = "Individual"

在 php 中初始化常量

initializing constants in php

php

constants