PHP & Case Sensitivity [duplicate]

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FYI

Case sensitive (both user-defined and PHP defined)

  • variables
  • constants
  • array keys
  • class properties
  • class constants

Case insensitive (both user defined and PHP defined)

  • functions
  • class constructors
  • class methods
  • keywords and constructs (if, else, null, foreach, echo etc.)

In php.net

Basics

Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive.

Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscores, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'

Some useful Links

  1. Userland Naming Guide
  2. Why are functions and methods in PHP case-insensitive?
  3. Are PHP functions case sensitive?
  4. Are PHP keywords case-sensitive?
  5. Is PHP function names case-sensitive or not?
  6. Source of PHP Case Sensitive

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