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 )
string | $key | Environment variable name. |
string|null | $default = null | Specify a default value in case the environment variable is not defined. |
string|null Environment variable setting.
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https://api.cakephp.org/3.4/function-env.html