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Basics

IT Notes → PHP @ December 22, 2020

  • Hypertext PreProcessor (Personal Home Page).
  • General purpose.
  • Object oriented.
  • Loosely typed.
  • Partially case sensitive.

 

  • Case sensitive (both user defined and PHP defined) – (1) variables (2) constants (3) array keys (4) class variables (5) class constants.
  • Case insensitive (both user defined and PHP defined) – (1) functions (2) class constructors (3) class functions (4) keywords and constructs (if, else, null etc).

 

  • Code caches or accelerators.
  • Zend engine compiles and then interpreted. There are few compilers which are mostly paid.
  • Extensions: Core, Bundled, PECL (PHP extension code library), third party and DIY (do-it-yourself).
  • PEAR (PHP extension and application repository) – DB:PHP.
  • SPL: Standard PHP library.

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