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1. Object name must be singular.

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   class Customer

2. Class name must follow the CamelCase practice, except that the first letter is uppercase.

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   class MyBeautifulClass

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Constants

1. Define Constant names must be written in uppercase, except for "true", "false" and "null" which must be lowercase: ENT_NOQUOTE, true.

2. Define Constant names have to be prefixed with "PS_" inside the core and module.

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   define('PS_DEBUG', 1); define('PS_MODULE_NAME_DEBUG', 1);

3. Define Constant names should only use alphabetical characters and "_".

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All keywords have to be lowercase: as, case, if, echo, null.

Constants

Constants must be uppercase, except for "true", "false" and "null" which must be lowercase: ENT_NOQUOTE, true.

Configuration variables

Configuration variables follow the same rules as defined above.

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