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ContentTransferEncoding uses ConstantsTrait

MIME `Content-Transfer-Encoding` values (RFC 2045 §6).

Declares how the body of a part was encoded for transport:

7bit, 8bit, binary are identity encodings — the data is left as-is (only line-length / byte-range guarantees differ).
quoted-printable and base64 actually transform the bytes and must be decoded before use.

BASE64 : string = 'base64': `base64` — Binary-safe base64 encoding.
BINARY : string = 'binary': `binary` — Arbitrary bytes with no line-length restriction.
EIGHT_BIT : string = '8bit': `8bit` — 8-bit data, lines ≤ 998 octets.
QUOTED_PRINTABLE : string = 'quoted-printable': `quoted-printable` — Mostly-ASCII text with `=XX` escapes.
SEVEN_BIT : string = '7bit': `7bit` — US-ASCII, lines ≤ 998 octets. The default when absent.

isIdentity() : bool: Whether the encoding leaves the data unchanged (`7bit` / `8bit` / `binary`) and therefore needs no decoding step.

`base64` — Binary-safe base64 encoding.


    public
        string
    BASE64
    = 'base64'

`binary` — Arbitrary bytes with no line-length restriction.


    public
        string
    BINARY
    = 'binary'

`8bit` — 8-bit data, lines ≤ 998 octets.


    public
        string
    EIGHT_BIT
    = '8bit'

`quoted-printable` — Mostly-ASCII text with `=XX` escapes.


    public
        string
    QUOTED_PRINTABLE
    = 'quoted-printable'

`7bit` — US-ASCII, lines ≤ 998 octets. The default when absent.


    public
        string
    SEVEN_BIT
    = '7bit'

Whether the encoding leaves the data unchanged (`7bit` / `8bit` / `binary`) and therefore needs no decoding step.


    public
            static        isIdentity(string $encoding) : bool

bool —

True for an identity encoding, false for quoted-printable / base64.