Calltoundefinedfunctionmb_substr () in PHP

How to handle Calltoundefinedfunctionmb_substr () in PHP! Recently developed extended functions, using the mb_substr () function. The system is normal in windows, but there is a problem under aliyun (Centos system selected). Calltoundefinedfunctionmb_substr (), this exception is reported. Obviously, this is the Call to undefined function mb_substr () processing method in PHP!

Recently developed extended functions, using the mb_substr () function. The system is normal in windows, but there is a problem under aliyun (Centos system selected). Call to undefined function mb_substr (), and this exception is reported.

Obviously, no defined functions are called, but the environment is installed using yum. Apache and PHP are automatically installed. How can this error be reported? In fact, PHP itself is configurable. in addition to the required extension libraries, PHP will be automatically installed, and other libraries will not be installed by default.

Solution:

Yum install php-mbstring Command installation. after installation, the service httpd restart restarts the apache server. everything is normal!