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 | $key | Environment variable name. |
string|boolean|null
Environment variable setting.
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http://api.cakephp.org/2.8/function-env.html