Class and Method Naming
Class name should be a noun (User, Post). Method name should be a verb (create, activate).
Class names should always start with an uppercase letter.
class Class_name {
function get_file_properties() {} // descriptive, underscore separator, and all lowercase letters
}
Variable Names
Variables should contain only lowercase letters, and be reasonably named to indicate their purpose and contents. Very short, non-word variables should only be used as iterators in for() loops.
for ($j = 0; $j < 10; $j++) $str $buffer $group_id $last_city