1、修改php.ini配置文件，首先找到如下配置信息
；variables_order
；Default Value: “EGPCS”
；Development Value: “GPCS”
；Production Value: “GPCS”
修改为：
；variables_order
Default Value: “EGPCS”
；Development Value: “GPCS”
；Production Value: “GPCS”

2、重启Apache或者Nginx
Apache重启：systemctl restart httpd
Nginx重启：systemctl restart nginx

3、检查Thinkphp目录下的Base.php文件是否已存在如下代码，无则添加

if (is_file(ROOT_PATH . ‘.env’)) {
$env=pars{e}_{i}n{i}_{f}ile(ROO{T}_{P}ATH{.}^{\prime }.en{v}^{\prime },true);foreach($env as $key => $val) {
$name=EN{V}_{P}REFIX.strtoupper($key);
if (is_array(KaTeX parse error: Expected '}', got 'EOF' at end of input: … foreach (val as $k => $v) {
$item = KaTeX parse error: Expected group after '_' at position 9: name . '_̲' . strtoupper(k);
putenv(“$item=$v”);
}
} else {
putenv(“$name=$val”);
//加入这一句
${}_{E}NV[$name]=$val;
}
}
}

4、最后就可以使用.env里面的配置了
[app]
debug = true
trace = true

[database]
hostname = localhost
database = test
username = test
password = ‘test@’
hostport = 3306
prefix = pr_

注意：如果.env里面有特殊符文，记得加上单引号或者双引号。如：上面的password