(PHP 3, PHP 4 )
Returns the value of the environment variable varname, or FALSE on an error.
<?php$ip = getenv("REMOTE_ADDR"); // get the ip number of the user?>
You can see a list of all the environmental variables by using phpinfo(). You can find out what many of them mean by taking a look at the CGI specification, specifically the page on environmental variables.
Note: This function does not work in ISAPI mode.
See also putenv().
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