Web Reference: Oct 22, 2015 Β· In PHP, variable and constant names are case sensitive, while function names and class names are not. As far as I am aware, PHP is the only language in which this happens. Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive. A valid variable name starts with a letter (A-Z, a-z, or the bytes from 128 through 255) or underscore, followed by any number of letters, numbers, or underscores. This tutorial introduces you to the basic PHP syntax including case sensitivity, statements, whitespaces and line breaks.
YouTube Excerpt: PHP Case Sensitivity
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