PHP Filters IDs

FILTER_VALIDATE_IP Check whether the given IP is valid or not
FILTER_VALIDATE_EMAIL Check whether the email is valid or not
FILTER_VALIDATE_INT Check whether the value is Integer or not
FILTER_VALIDATE_FLOAT Check whether the value is float or not
FILTER_VALIDATE_URL Check whether the url is valid or not
FILTER_SANITIZE_SPECIAL_CHARS  It Escapes special characters like &,< etc
FILTER_CALLBACK It can be used to call a user defined function to filter the value
FILTER_SANITIZE_STRING Strip tags and encode special characters
FILTER_SANITIZE_STRIPPED  Strips or encodes unwanted characters
FILTER_SANITIZE_ENCODED  Encode special characters
FILTER_SANITIZE_EMAIL Remove all illegal email characters
FILTER_SANITIZE_NUMBER_INT Remove all illegal integer characters
FILTER_SANITIZE_NUMBER_FLOAT  Remove all illegal  characters from a float number
FILTER_SANITIZE_MAGIC_QUOTES It adds slashes before quotes
FILTER_UNSAFE_RAW Encode special characters
FILTER_VALIDATE_BOOLEAN Return TRUE for “true”, “1”, “on” and “yes”, FALSE for “0”,
“false”, “off”, “no”, and “”, NULL otherwise
FILTER_SANITIZE_URL Remove all unwanterd characters form a URL
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