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My PHP Naming Convention

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Files: lower_case
Classes: Proper_Case (nouns)
Variables: lower_case (short and meaningful)
Functions: lower_case (verbs), questions with 'is_' preffix (is_enabled)
Constants: UPPER_CASE
DB Tables: lower_case (pluralized nouns)
DB Fields: lower_case (singular). Dates with '_on' suffix, questions with 'is_' preffix, user related with '_by' suffix