Rules
Rules
Rules
The following list gives an overview of which
rights the PHP project reserves for itself, when choosing names for
new internal identifiers. The definitive guide is the official
» CODING STANDARDS:
-
PHP owns the top-level namespace but tries to find
decent descriptive names and avoid any obvious clashes. -
Function names use underscores between words, while
class names use both the camelCase and PascalCase
rules. -
PHP will prefix any global symbols of an extension
with the name of the extension. (In the past, there have been
numerous exceptions to this rule.) Examples:-
PREG_SPLIT_DELIM_CAPTURE
-
new DOMDocument()
-
strpos()
(example of a past mistake) -
new SplFileObject()
-
Iterators and Exceptions are however simply
postfixed with “Iterator” and “Exception.”
Examples: -
PHP reserves all symbols starting with __
as magical. It is recommended that you do not create symbols
starting with __ in PHP unless you want to use documented
magical functionality. Examples: