# Data Filtering

- Introducere
- Instalarea / configurarea
  - Necesități
  - Instalarea
  - Configurația la rulare
  - Tipurile resurselor
- Types of filters
  - Validate filters
  - Sanitize filters
  - Other filters
  - Filter flags
- Constante predefinite
- Exemple
  - Validation
  - Sanitization
- Funcții de filtrare
  - filter_has_var — Checks if variable of specified type exists
  - filter_id — Returns the filter ID belonging to a named filter
  - filter_input_array — Gets external variables and optionally filters them
  - filter_input — Gets a specific external variable by name and optionally filters it
  - filter_list — Returns a list of all supported filters
  - filter_var_array — Gets multiple variables and optionally filters them
  - filter_var — Filters a variable with a specified filter