How does PHP determine whether the server is APACHE or IIS?

How does PHP determine whether the server is APACHE or IIS?

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If (isset ($ _ SERVER ['http _ X_REWRITE_URL ']) // IISelse if (isset ($ _ SERVER ['orig _ PATH_INFO']) // IIS 5.0 CGI // The above two lines of code are restored in yii. // For reference only

Open phpinfo and you will be able to see the relevant functions.

_ SERVER ["SERVER_SOFTWARE"]
Apache/2.4.2 (Win64) PHP/5.4.3

PHP code? 123456if (isset ($ _ SERVER ['http _ X_REWRITE_URL ']) // IIS else if (isset ($ _ SERVER ['orig _ PATH_INFO']) // IIS 5.0 CGI // The above two lines of code are restored in yii. // For reference only

Yang sir is also engaged in Yii?

Reference yangball on the first floor: PHP code? 123456if (isset ($ _ SERVER ['http _ X_REWRITE_URL ']) // IIS else if (isset ($ _ SERVER ['orig _ PATH_INFO']) // IIS 5.0 CGI // The above two lines of code are restored in yii. // For reference only

Yang sir is also working on ......
The project is using yii.