预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

NIL ( integer )
OP_DEBUG ( integer )
OP_READONLY ( integer ): Open mailbox read-only
OP_ANONYMOUS ( integer ): Don't use or update a .newsrc for news (NNTP only)
OP_SHORTCACHE ( integer )
OP_SILENT ( integer )
OP_PROTOTYPE ( integer )
OP_HALFOPEN ( integer ): For IMAP and NNTP names, open a connection but don't open a mailbox.
OP_EXPUNGE ( integer )
OP_SECURE ( integer )
CL_EXPUNGE ( integer ): silently expunge the mailbox before closing when calling imap_close()
FT_UID ( integer ): The parameter is a UID
FT_PEEK ( integer ): Do not set the \Seen flag if not already set
FT_NOT ( integer )
FT_INTERNAL ( integer ): The return string is in internal format, will not canonicalize to CRLF.
FT_PREFETCHTEXT ( integer )
ST_UID ( integer ): The sequence argument contains UIDs instead of sequence numbers
ST_SILENT ( integer )
ST_SET ( integer )
CP_UID ( integer ): the sequence numbers contain UIDS
CP_MOVE ( integer ): Delete the messages from the current mailbox after copying with imap_mail_copy()
SE_UID ( integer ): Return UIDs instead of sequence numbers
SE_FREE ( integer )
SE_NOPREFETCH ( integer ): Don't prefetch searched messages
SO_FREE ( integer )
SO_NOSERVER ( integer )
SA_MESSAGES ( integer )
SA_RECENT ( integer )
SA_UNSEEN ( integer )
SA_UIDNEXT ( integer )
SA_UIDVALIDITY ( integer )
SA_ALL ( integer )
LATT_NOINFERIORS ( integer ): This mailbox has no "children" (there are no mailboxes below this one).
LATT_NOSELECT ( integer ): This is only a container, not a mailbox - you cannot open it.
LATT_MARKED ( integer ): This mailbox is marked. Only used by UW-IMAPD.
LATT_UNMARKED ( integer ): This mailbox is not marked. Only used by UW-IMAPD.
SORTDATE ( integer ): Sort criteria for imap_sort() : message Date
SORTARRIVAL ( integer ): Sort criteria for imap_sort() : arrival date
SORTFROM ( integer ): Sort criteria for imap_sort() : mailbox in first From address
SORTSUBJECT ( integer ): Sort criteria for imap_sort() : message subject
SORTTO ( integer ): Sort criteria for imap_sort() : mailbox in first To address
SORTCC ( integer ): Sort criteria for imap_sort() : mailbox in first cc address
SORTSIZE ( integer ): Sort criteria for imap_sort() : size of message in octets
TYPETEXT ( integer ): Primary body type: unformatted text
TYPEMULTIPART ( integer ): Primary body type: multiple part
TYPEMESSAGE ( integer ): Primary body type: encapsulated message
TYPEAPPLICATION ( integer ): Primary body type: application data
TYPEAUDIO ( integer ): Primary body type: audio
TYPEIMAGE ( integer ): Primary body type: static image
TYPEVIDEO ( integer ): Primary body type: video
TYPEMODEL ( integer ): Primary body type: model
TYPEOTHER ( integer ): Primary body type: unknown
ENC7BIT ( integer ): Body encoding: 7 bit SMTP semantic data
ENC8BIT ( integer ): Body encoding: 8 bit SMTP semantic data
ENCBINARY ( integer ): Body encoding: 8 bit binary data
ENCBASE64 ( integer ): Body encoding: base-64 encoded data
ENCQUOTEDPRINTABLE ( integer ): Body encoding: human-readable 8-as-7 bit data
ENCOTHER ( integer ): Body encoding: unknown
IMAP_OPENTIMEOUT ( integer )
IMAP_READTIMEOUT ( integer )
IMAP_WRITETIMEOUT ( integer )
IMAP_CLOSETIMEOUT ( integer )
LATT_REFERRAL ( integer )
LATT_HASCHILDREN ( integer )
LATT_HASNOCHILDREN ( integer )
IMAP_GC_ELT ( integer ): Garbage collector, clear message cache elements.
IMAP_GC_ENV ( integer ): Garbage collector, clear envelopes and bodies.
IMAP_GC_TEXTS ( integer ): Garbage collector, clear texts.