以下の定数が定義されています。 この関数の拡張モジュールが PHP 組み込みでコンパイルされているか、 実行時に動的にロードされている場合のみ使用可能です。
NIL
(int) OP_DEBUG
(int) OP_READONLY
(int) OP_ANONYMOUS
(int) OP_SHORTCACHE
(int) OP_SILENT
(int) OP_PROTOTYPE
(int) OP_HALFOPEN
(int) OP_EXPUNGE
(int) OP_SECURE
(int) CL_EXPUNGE
(int) FT_UID
(int) FT_PEEK
(int) FT_NOT
(int) FT_INTERNAL
(int) FT_PREFETCHTEXT
(int) ST_UID
(int) ST_SILENT
(int) ST_SET
(int) CP_UID
(int) CP_MOVE
(int) SE_UID
(int) SE_FREE
(int) SE_NOPREFETCH
(int) SO_FREE
(int) SO_NOSERVER
(int) SA_MESSAGES
(int) SA_RECENT
(int) SA_UNSEEN
(int) SA_UIDNEXT
(int) SA_UIDVALIDITY
(int) SA_ALL
(int) LATT_NOINFERIORS
(int) LATT_NOSELECT
(int) LATT_MARKED
(int) LATT_UNMARKED
(int) LATT_REFERRAL
(int) LATT_HASCHILDREN
(int) LATT_HASNOCHILDREN
(int) SORTDATE
(int) SORTARRIVAL
(int) SORTFROM
(int) SORTSUBJECT
(int) SORTTO
(int) SORTCC
(int) SORTSIZE
(int) TYPETEXT
(int) TYPEMULTIPART
(int) TYPEMESSAGE
(int) TYPEAPPLICATION
(int) TYPEAUDIO
(int) TYPEIMAGE
(int) TYPEVIDEO
(int) TYPEMODEL
(int) TYPEOTHER
(int) ENC7BIT
(int) ENC8BIT
(int) ENCBINARY
(int) ENCBASE64
(int) ENCQUOTEDPRINTABLE
(int) ENCOTHER
(int) IMAP_OPENTIMEOUT
(int) IMAP_READTIMEOUT
(int) IMAP_WRITETIMEOUT
(int) IMAP_CLOSETIMEOUT
(int) IMAP_GC_ELT
(int) IMAP_GC_ENV
(int) IMAP_GC_TEXTS
(int)