$_SERVER['SERVER_NAME'] gives the value of the server name as defined in host configuration (i.e for Apache the Apache .conf file). $_SERVER['HTTP_HOST'] gives you the domain name through which the current request is being fulfilled and is more directly related to the request.
The value of $_SERVER['HTTP_HOST'] is taken directly from the Host: HTTP request header. It appears the requesting client is filling it in that way. I suggest using $_SERVER['SERVER_NAME'] instead as its value will be set from your virtual host config. gethostbyname() - Get the IPv4 address corresponding to a given Internet host name; gethostbyaddr() - Get the Internet host name corresponding to a given IP address; php_uname() - Returns information about the operating system PHP is running on Note: HTTP_HOST is created dynamically by PHP based on the value of the HTTP HOST Header in the request, thus possibly allowing for file inclusion vulnerabilities. SERVER_NAME may also be created dynamically. $_SERVER['SERVER_NAME'] gives the value of the server name as defined in host configuration (i.e for Apache the Apache .conf file). $_SERVER['HTTP_HOST'] gives you the domain name through which the current request is being fulfilled and is more directly related to the request.
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