Using filter_var() to filter and validate

• Common validation filters

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  • filter_var() with validation filters return TRUE or FALSE
  • FILTER_VALIDATE_EMAIL
  • FILTER_VALIDATE_INT
  • FILTER_VALIDATE_IP

• Common sanitization filters

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  • filter_var() with "sanitize" filters causes filtering to take place
  • FILTER_SANITIZE_EMAIL
  • FILTER_SANITIZE_NUMBER_INT