Gets an environment variable from available sources, and provides emulation for unsupported or inconsistent environment variables (i.e. DOCUMENT_ROOT on IIS, or SCRIPT_NAME in CGI mode). Also exposes some additional custom environment information.
env( string $key , string|null $default = null )
| || ||Environment variable name.|
| || ||Specify a default value in case the environment variable is not defined.|
string|boolean|nullEnvironment variable setting.
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