PHP Coding Specification (_php) tutorial

8.1 Namespaces

A unique namespace prefix is always all lowercase ascii letters and is a top-level domain name, usually a com,edu,gov,mil,net,org, or an English double-character code for the identity country specified in the 1981 ISO 3166 standard. The subsequent parts of the namespace vary according to the naming conventions of each organization. Such naming conventions may be distinguished by the composition of a particular directory name (department), by Project (project), by machine, or by a registered name (login names), or by a function module.

Name of the 8.2.1 class property

Attribute naming should be prefixed with the character ' M '.
The prefix ' m ' is followed by a rule with a consistent class naming.
' m ' always modifies at the beginning of the name, as if it were a reference to the beginning of ' R '.
Reason
The prefix m prevents any conflicts between class properties and method names. Your method name and attribute name are often very similar, especially for accessing elements.
For example
Class Nameonetwo
{
int $MVARABC;
int $mErrorNumber;
String $mrName;
}

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