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Variables

Lifetime of variables is the current script/function.

Variables defined outside any function:

  • have global scope (over whole to script)
  • but are not accessible within functions unless "requested": 

    function f() { global $max_num, $colour; .... }

Pre-defined "Super-global" arrays (e.g. $_SERVER, ...):
  • contain "environment" values (server ENV, CGI params, etc.)
  • are accessible from anywhere in the script