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If your package needs to define global variables, their names
should start with a single underscore followed by the package
name and another underscore. For example, the PEAR package uses
a global variable called $_PEAR_destructor_object_list.
Global functions should be named using the "studly caps"
style (also referred to as "bumpy case" or "camel
caps"). In addition, they should have the package name as
a prefix, to avoid name collisions between packages. The initial letter
of the name (after the prefix) is lowercase, and each letter that
starts a new "word" is capitalized. An example:
Classes should be given descriptive names. Avoid using abbreviations
where possible. Class names should always begin with an uppercase
letter. The PEAR class hierarchy is also reflected in the class name,
each level of the hierarchy separated with a single underscore.
Examples of good class names are:
Class variables (a.k.a properties) and methods should
be named using the "studly caps" style (also referred
to as "bumpy case" or "camel caps").
Some examples (these would be "public" members):
$counter
connect()
getData()
buildSomeWidget()
Private class members (meaning class members that are intended
to be used only from within the same class in which they are
declared; PHP does not yet support truly-enforceable private
namespaces) are preceded by a single underscore. For example:
$_status
_sort()
_initTree()
Note: The following applies to PHP5.
Protected class members (meaning class members that are intended
to be used only from within the same class in which they are
declared or from subclasses that extend it) are not preceded by a single
underscore. For example:
Constants should always be all-uppercase, with underscores to
separate words. Prefix constant names with the uppercased name
of the class/package they are used in. Some examples:
DB_DATASOURCENAME
SERVICES_AMAZON_S3_LICENSEKEY
Note:
The true, false and
null constants are excepted from the all-uppercase
rule, and must always be lowercase.
