PHP: Filter flags

Filter flags

**List of filter flags**
ID	Used with	Description
`FILTER_FLAG_STRIP_LOW`	`FILTER_SANITIZE_ENCODED`, `FILTER_SANITIZE_SPECIAL_CHARS`, `FILTER_SANITIZE_STRING`, `FILTER_UNSAFE_RAW`	Strips characters that have a numerical value <32.
`FILTER_FLAG_STRIP_HIGH`	`FILTER_SANITIZE_ENCODED`, `FILTER_SANITIZE_SPECIAL_CHARS`, `FILTER_SANITIZE_STRING`, `FILTER_UNSAFE_RAW`	Strips characters that have a numerical value >127.
`FILTER_FLAG_STRIP_BACKTICK`	`FILTER_SANITIZE_ENCODED`, `FILTER_SANITIZE_SPECIAL_CHARS`, `FILTER_SANITIZE_STRING`, `FILTER_UNSAFE_RAW`	Strips backtick characters.
`FILTER_FLAG_NO_ENCODE_QUOTES`	`FILTER_SANITIZE_STRING`	If this flag is present, single (`'`) and double (`"`) quotes will not be encoded.
`FILTER_FLAG_ENCODE_LOW`	`FILTER_SANITIZE_ENCODED`, `FILTER_SANITIZE_STRING`, `FILTER_UNSAFE_RAW`	Encodes all characters with a numerical value <32.
`FILTER_FLAG_ENCODE_HIGH`	`FILTER_SANITIZE_ENCODED`, `FILTER_SANITIZE_SPECIAL_CHARS`, `FILTER_SANITIZE_STRING`, `FILTER_UNSAFE_RAW`	Encodes all characters with a numerical value >127.
`FILTER_FLAG_ENCODE_AMP`	`FILTER_SANITIZE_STRING`, `FILTER_UNSAFE_RAW`	Encodes ampersands (`&`).

Versione	Descrizione
8.2.0	`FILTER_FLAG_GLOBAL_RANGE` as a flag to `FILTER_VALIDATE_IP` has been added.
7.3.0	The explicit usage of `FILTER_FLAG_SCHEME_REQUIRED` and `FILTER_FLAG_HOST_REQUIRED` has been deprecated.
7.1.0	`FILTER_FLAG_EMAIL_UNICODE` has been added.

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