When installing Yii, open Web page displays Mb_strlen () error,

Display: Call to undefined function Yii\helpers\mb_strlen ()

1. PHP.ini in Mb_string has been opened, with the php-m display is open

2. Should not be an extension library path issue, because mysqli is not a problem to use.

Now puzzled there apart from the problem!

PS: The same URL, why Firefox can display PHP page, chrome directly download this page?

页面就一个ECHO而已。

Reply content:

Display: Call to undefined function Yii\helpers\mb_strlen ()

1. PHP.ini in Mb_string has been opened, with the php-m display is open

2. Should not be an extension library path issue, because mysqli is not a problem to use.

Now puzzled there apart from the problem!

PS: The same URL, why Firefox can display PHP page, chrome directly download this page?

页面就一个ECHO而已。

See if this function is disabled in php.ini.

Call to undefined function yii\helpers\mb_strlen()从这句可以看出你没有使用扩展提供的函数，而是默认试用了yii框架提供的，没认真用过yii，建议排查下。关于页面下载的问题，这一般都是服务器配置问题。如果你的Webserver是Nginx，那就要配置fastcgi项，具体请Google,不做赘述。

