August 2000
Intermediate to advanced
800 pages
13h 15m
English
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web Sites
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Identifiers
Identifiers give names to the abstract parts of PHP: functions, variables, and classes. Some of them are created by PHP in the form of built-in functions or environment variables. Others you create. Identifiers may be of any length and can consists of letters, numbers, or underscores. The first character of an identifier must be either a letter or an underscore. Table 2.1 contrasts acceptable identifiers with unacceptable ones.
Upper- and lowercase letters are recognized as different. That is, the variables UserName and username are two distinct identifiers. The exception is built-in functions. As stated in Chapter 1, "An Introduction to PHP," functions like print can be called as Print if you prefer.
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