我有一个定义常量变量的文件，如下所示：
define_vars.php
<?
define("something","value");
define("something1","value");
define("something2","value");
define("something3","value");
我有一个函数，它将$var解析为常量变量名，如下所示：
function something($var=''){
include('define_vars.php');
// $var is the name of one of the variables I am defining in the other file (define_vars.php)
// So $var may have a value of "something3", which is the name of one of the constants defined in the other file...
}
我需要以某种方式获得常数的值，当$var包含我希望获得的常数的名称时。。。。有意义吗？：S
有什么想法吗？
http://php.net/constant
function something($var) {
if (defined($var)) {
$value = constant($var);
}
}
此外，您应该确保包含定义的文件只包含一次，所以请改用require_once('define_vars.php');。
您想要constant()
constant($var); // value
使用constant（）获取值。你可以做一些类似的事情
function something($var = '') {
include_once('define_vars.php'); //you don't want to include the file more than once or it will cause a fatal error when trying to redefine your constants
return (defined($var) ? constant($var) : null);
}