getenvGets the value of a single or all environment variables
&reftitle.description;
stringarrayfalsegetenvstringnullname&null;boollocal_only&false;
Gets the value of a single or all environment variables.
You can see a list of all the environmental variables by using
phpinfo. Many of these variables are listed within
RFC 3875, specifically
section 4.1, "Request Meta-Variables".
&reftitle.parameters;
name
The variable name as a &string; or &null;.
local_only
When set to &true;, only local environment variables are returned, set by the operating system or putenv. It only has
an effect when name is a &string;.
&reftitle.returnvalues;
Returns the value of the environment variable
name, or &false; if the environment
variable name does not exist.
If name is &null;, all environment variables are
returned as an associative array.
&reftitle.changelog;
&Version;&Description;8.0.0
The name is now nullable.
7.1.0
The name can now be omitted to retrieve an
associative array of all environment variables.
7.0.9
The local_only parameter has been added.
&reftitle.examples;
<function>getenv</function> Example
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&reftitle.notes;
If PHP is running in a SAPI such as Fast CGI, this function will
always return the value of an environment variable set by the SAPI,
even if putenv has been used to set a local
environment variable of the same name. Use the local_only
parameter to return the value of locally-set environment variables.
&reftitle.seealso;
putenvapache_getenvSuperglobals