Ces constantes sont définies par cette extension, et ne sont disponibles que si cette extension a été compilée avec PHP, ou bien chargée au moment de l'exécution.
Les descriptions ainsi que les usages de ces constantes sont décrites dans la documentation des fonctions curl_setopt(), curl_multi_setopt() et curl_getinfo().
CURLOPT_AUTOREFERER
    (int)
   CURLOPT_DOH_URL
    (int)
   CURLOPT_DNS_USE_GLOBAL_CACHE
    (int)
   CURLOPT_DNS_CACHE_TIMEOUT
    (int)
   CURLOPT_FTP_SSL
    (int)
   CURLFTP_CREATE_DIR
   (int)
  CURLFTP_CREATE_DIR_NONE
    (int)
   CURLFTP_CREATE_DIR_RETRY
    (int)
   CURLFTPSSL_TRY
    (int)
   CURLFTPSSL_ALL
    (int)
   CURLFTPSSL_CONTROL
    (int)
   CURLFTPSSL_NONE
    (int)
   CURLOPT_PRIVATE
    (int)
   CURLOPT_FTPSSLAUTH
    (int)
   CURLOPT_PORT
    (int)
   CURLOPT_FILE
    (int)
   CURLOPT_INFILE
    (int)
   CURLOPT_INFILESIZE
    (int)
   CURLOPT_ISSUERCERT_BLOB
    (int)
   CURLOPT_URL
    (int)
   CURLOPT_PROXY
    (int)
   CURLOPT_PROXY_ISSUERCERT
    (int)
   CURLOPT_PROXY_ISSUERCERT_BLOB
    (int)
   CURLOPT_PROXY_SSLCERT_BLOB
    (int)
   CURLOPT_PROXY_SSLKEY_BLOB
    (int)
   CURLOPT_VERBOSE
    (int)
   CURLOPT_HEADER
    (int)
   CURLOPT_HTTPHEADER
    (int)
   CURLOPT_NOPROGRESS
    (int)
   CURLOPT_NOBODY
    (int)
   CURLOPT_FAILONERROR
    (int)
   CURLOPT_UPLOAD
    (int)
   CURLOPT_POST
    (int)
   CURLOPT_FTPLISTONLY
    (int)
   CURLOPT_FTPAPPEND
    (int)
   CURLOPT_FTP_CREATE_MISSING_DIRS
    (int)
   CURLOPT_NETRC
    (int)
   CURLOPT_FOLLOWLOCATION
    (int)
   CURLOPT_FTPASCII
    (int)
   CURLOPT_PUT
    (int)
   CURLOPT_MUTE
    (int)
   CURLOPT_USERPWD
    (int)
   CURLOPT_PROXYUSERPWD
    (int)
   CURLOPT_RANGE
    (int)
   CURLOPT_TIMEOUT
    (int)
   CURLOPT_TIMEOUT_MS
    (int)
   CURLOPT_TCP_NODELAY
    (int)
   CURLOPT_POSTFIELDS
    (int)
   CURLOPT_PROGRESSFUNCTION
    (int)
   CURLOPT_REFERER
    (int)
   CURLOPT_USERAGENT
    (int)
   CURLOPT_FTPPORT
    (int)
   CURLOPT_FTP_USE_EPSV
    (int)
   CURLOPT_LOW_SPEED_LIMIT
    (int)
   CURLOPT_LOW_SPEED_TIME
    (int)
   CURLOPT_RESUME_FROM
    (int)
   CURLOPT_SSLCERT
    (int)
   CURLOPT_SSLCERT_BLOB
    (int)
   CURLOPT_SSLCERTPASSWD
    (int)
   CURLOPT_SSLKEY_BLOB
    (int)
   CURLOPT_WRITEHEADER
    (int)
   CURLOPT_SSL_VERIFYHOST
    (int)
   CURLOPT_SSLVERSION
    (int)
   CURL_SSLVERSION_DEFAULT
    (int)
   CURL_SSLVERSION_TLSv1
    (int)
   CURL_SSLVERSION_SSLv2
    (int)
   CURL_SSLVERSION_SSLv3
    (int)
   CURL_SSLVERSION_TLSv1_0
    (int)
   CURL_SSLVERSION_TLSv1_1
    (int)
   CURL_SSLVERSION_TLSv1_2
    (int)
   CURLOPT_TIMECONDITION
    (int)
   CURLOPT_TIMEVALUE
    (int)
   CURLOPT_CUSTOMREQUEST
    (int)
   CURLOPT_STDERR
    (int)
   CURLOPT_TRANSFERTEXT
    (int)
   CURLOPT_RETURNTRANSFER
    (int)
   CURLOPT_QUOTE
    (int)
   CURLOPT_POSTQUOTE
    (int)
   CURLOPT_INTERFACE
    (int)
   CURLOPT_KRB4LEVEL
    (int)
   CURLOPT_HTTPPROXYTUNNEL
    (int)
   CURLOPT_FILETIME
    (int)
   CURLOPT_WRITEFUNCTION
    (int)
   CURLOPT_READFUNCTION
    (int)
   CURLOPT_PASSWDFUNCTION
    (int)
   CURLOPT_HEADERFUNCTION
    (int)
   CURLOPT_MAXREDIRS
    (int)
   CURLOPT_MAXCONNECTS
    (int)
   CURLOPT_FRESH_CONNECT
    (int)
   CURLOPT_FORBID_REUSE
    (int)
   CURLOPT_RANDOM_FILE
    (int)
   CURLOPT_EGDSOCKET
    (int)
   CURLOPT_CONNECTTIMEOUT
    (int)
   CURLOPT_CONNECTTIMEOUT_MS
    (int)
   CURLOPT_SSL_VERIFYPEER
    (int)
   CURLOPT_CAINFO
    (int)
   CURLOPT_CAPATH
    (int)
   CURLOPT_SSL_CIPHER_LIST
    (int)
   CURLOPT_BINARYTRANSFER
    (int)
   CURLOPT_NOSIGNAL
    (int)
   CURLOPT_PROXYTYPE
    (int)
   CURLOPT_BUFFERSIZE
    (int)
   CURLOPT_HTTPGET
    (int)
   CURLOPT_HTTP_VERSION
    (int)
   CURLOPT_SSLKEY
    (int)
   CURLOPT_SSLKEYTYPE
    (int)
   CURLOPT_SSLKEYPASSWD
    (int)
   CURLOPT_SSLENGINE
    (int)
   CURLOPT_SSLENGINE_DEFAULT
    (int)
   CURLOPT_SSLCERTTYPE
    (int)
   CURLOPT_CRLF
    (int)
   CURLOPT_ENCODING
    (int)
   CURLOPT_PROXYPORT
    (int)
   CURLOPT_UNRESTRICTED_AUTH
    (int)
   CURLOPT_FTP_USE_EPRT
    (int)
   CURLOPT_HTTP200ALIASES
    (int)
   CURLOPT_HTTPAUTH
    (int)
   CURLAUTH_BASIC
    (int)
   CURLAUTH_DIGEST
    (int)
   CURLAUTH_GSSNEGOTIATE
    (int)
   CURLAUTH_NEGOTIATE
    (int)
   CURLAUTH_NTLM
    (int)
   CURLAUTH_NTLM_WB
    (int)
   CURLAUTH_ANY
    (int)
   CURLAUTH_ANYSAFE
    (int)
   CURLOPT_PROXYAUTH
    (int)
   CURLOPT_MAX_RECV_SPEED_LARGE
    (int)
   CURLOPT_MAX_SEND_SPEED_LARGE
    (int)
   CURLOPT_HEADEROPT
    (int)
   CURLOPT_PROXYHEADER
    (int)
   CURLINFO_PRIVATE
    (int)
   CURLINFO_EFFECTIVE_URL
    (int)
   CURLINFO_HTTP_CODE
    (int)
   CURLINFO_RESPONSE_CODE
    
   CURLINFO_RESPONSE_CODE
    (int)
   CURLINFO_HEADER_OUT
    (int)
   CURLINFO_HEADER_SIZE
    (int)
   CURLINFO_REQUEST_SIZE
    (int)
   CURLINFO_TOTAL_TIME
    (int)
   CURLINFO_NAMELOOKUP_TIME
    (int)
   CURLINFO_CONNECT_TIME
    (int)
   CURLINFO_PRETRANSFER_TIME
    (int)
   CURLINFO_SIZE_UPLOAD
    (int)
   CURLINFO_SIZE_DOWNLOAD
    (int)
   CURLINFO_SPEED_DOWNLOAD
    (int)
   CURLINFO_SPEED_UPLOAD
    (int)
   CURLINFO_FILETIME
    (int)
   CURLINFO_SSL_VERIFYRESULT
    (int)
   CURLINFO_CONTENT_LENGTH_DOWNLOAD
    (int)
   CURLINFO_CONTENT_LENGTH_UPLOAD
    (int)
   CURLINFO_STARTTRANSFER_TIME
    (int)
   CURLINFO_CONTENT_TYPE
    (int)
   CURLINFO_REDIRECT_TIME
    (int)
   CURLINFO_REDIRECT_COUNT
    (int)
   CURLINFO_REDIRECT_URL
    (string)
   CURLINFO_PRIMARY_IP
    (string)
   CURLINFO_PRIMARY_PORT
    (int)
   CURLINFO_LOCAL_IP
    (string)
   CURLINFO_LOCAL_PORT
    (int)
   CURL_PUSH_OK
    (int)
   CURL_PUSH_DENY
    (int)
   CURL_REDIR_POST_301
    (int)
   CURL_REDIR_POST_302
    (int)
   CURL_REDIR_POST_303
    (int)
   CURL_REDIR_POST_ALL
    (int)
   CURL_TIMECOND_NONE
    (int)
   CURL_TIMECOND_IFMODSINCE
    (int)
   CURL_TIMECOND_IFUNMODSINCE
    (int)
   CURL_TIMECOND_LASTMOD
    (int)
   CURL_VERSION_ALTSVC
    (int)
   CURL_VERSION_ASYNCHDNS
    (int)
   CURL_VERSION_BROTLI
    (int)
   CURL_VERSION_CONV
    (int)
   CURL_VERSION_CURLDEBUG
    (int)
   CURL_VERSION_DEBUG
    (int)
   CURL_VERSION_GSSAPI
    (int)
   CURL_VERSION_GSSNEGOTIATE
    (int)
   CURL_VERSION_IDN
    (int)
   CURL_VERSION_MULTI_SSL
    (int)
   CURL_VERSION_NTLM
    (int)
   CURL_VERSION_NTLM_WB
    (int)
   CURL_VERSION_IPV6
    (int)
   CURL_VERSION_KERBEROS4
    (int)
   CURL_VERSION_KERBEROS5
    (int)
   CURL_VERSION_HTTP2
    (int)
   CURL_VERSION_LARGEFILE
    (int)
   CURL_VERSION_PSL
    (int)
   CURL_VERSION_SPNEGO
    (int)
   CURL_VERSION_SSPI
    (int)
   CURL_VERSION_SSL
    (int)
   CURL_VERSION_TLSAUTH_SRP
    (int)
   CURL_VERSION_UNIX_SOCKETS
    (int)
   CURL_VERSION_LIBZ
    (int)
   CURLVERSION_NOW
    (int)
   CURLE_OK
    (int)
   CURLE_UNSUPPORTED_PROTOCOL
    (int)
   CURLE_FAILED_INIT
    (int)
   CURLE_URL_MALFORMAT
    (int)
   CURLE_URL_MALFORMAT_USER
    (int)
   CURLE_COULDNT_RESOLVE_PROXY
    (int)
   CURLE_COULDNT_RESOLVE_HOST
    (int)
   CURLE_COULDNT_CONNECT
    (int)
   CURLE_FTP_WEIRD_SERVER_REPLY
    (int)
   CURLE_FTP_ACCESS_DENIED
    (int)
   CURLE_FTP_USER_PASSWORD_INCORRECT
    (int)
   CURLE_FTP_WEIRD_PASS_REPLY
    (int)
   CURLE_FTP_WEIRD_USER_REPLY
    (int)
   CURLE_FTP_WEIRD_PASV_REPLY
    (int)
   CURLE_FTP_WEIRD_227_FORMAT
    (int)
   CURLE_FTP_CANT_GET_HOST
    (int)
   CURLE_FTP_CANT_RECONNECT
    (int)
   CURLE_FTP_COULDNT_SET_BINARY
    (int)
   CURLE_PARTIAL_FILE
    (int)
   CURLE_FTP_COULDNT_RETR_FILE
    (int)
   CURLE_FTP_WRITE_ERROR
    (int)
   CURLE_FTP_QUOTE_ERROR
    (int)
   CURLE_HTTP_NOT_FOUND
    (int)
   CURLE_WRITE_ERROR
    (int)
   CURLE_MALFORMAT_USER
    (int)
   CURLE_FTP_COULDNT_STOR_FILE
    (int)
   CURLE_READ_ERROR
    (int)
   CURLE_OUT_OF_MEMORY
    (int)
   CURLE_OPERATION_TIMEOUTED
    (int)
   CURLE_FTP_COULDNT_SET_ASCII
    (int)
   CURLE_FTP_PORT_FAILED
    (int)
   CURLE_FTP_COULDNT_USE_REST
    (int)
   CURLE_FTP_COULDNT_GET_SIZE
    (int)
   CURLE_HTTP_RANGE_ERROR
    (int)
   CURLE_HTTP_POST_ERROR
    (int)
   CURLE_SSL_CONNECT_ERROR
    (int)
   CURLE_FTP_BAD_DOWNLOAD_RESUME
    (int)
   CURLE_FILE_COULDNT_READ_FILE
    (int)
   CURLE_LDAP_CANNOT_BIND
    (int)
   CURLE_LDAP_SEARCH_FAILED
    (int)
   CURLE_LIBRARY_NOT_FOUND
    (int)
   CURLE_FUNCTION_NOT_FOUND
    (int)
   CURLE_ABORTED_BY_CALLBACK
    (int)
   CURLE_BAD_FUNCTION_ARGUMENT
    (int)
   CURLE_BAD_CALLING_ORDER
    (int)
   CURLE_HTTP_PORT_FAILED
    (int)
   CURLE_BAD_PASSWORD_ENTERED
    (int)
   CURLE_TOO_MANY_REDIRECTS
    (int)
   CURLE_UNKNOWN_TELNET_OPTION
    (int)
   CURLE_TELNET_OPTION_SYNTAX
    (int)
   CURLE_OBSOLETE
    (int)
   CURLE_SSL_PEER_CERTIFICATE
    (int)
   CURLE_GOT_NOTHING
    (int)
   CURLE_SSL_ENGINE_NOTFOUND
    (int)
   CURLE_SSL_ENGINE_SETFAILED
    (int)
   CURLE_SEND_ERROR
    (int)
   CURLE_RECV_ERROR
    (int)
   CURLE_SSL_CERTPROBLEM
    (int)
   CURLE_SSL_CIPHER
    (int)
   CURLE_SSL_CACERT
    (int)
   CURLE_BAD_CONTENT_ENCODING
    (int)
   CURLE_LDAP_INVALID_URL
    (int)
   CURLE_FILESIZE_EXCEEDED
    (int)
   CURLE_FTP_SSL_FAILED
    (int)
   CURLE_SSH
    (int)
   CURLFTPAUTH_DEFAULT
    (int)
   CURLFTPAUTH_SSL
    (int)
   CURLFTPAUTH_TLS
    (int)
   CURLPROXY_HTTP
    (int)
   CURLPROXY_HTTP_1_0
    (int)
   CURLPROXY_SOCKS4
    (int)
   CURLPROXY_SOCKS5
    (int)
   CURL_NETRC_OPTIONAL
    (int)
   CURL_NETRC_IGNORED
    (int)
   CURL_NETRC_REQUIRED
    (int)
   CURL_HTTP_VERSION_NONE
    (int)
   CURL_HTTP_VERSION_1_0
    (int)
   CURL_HTTP_VERSION_1_1
    (int)
   CURL_HTTP_VERSION_2
    (int)
   CURL_HTTP_VERSION_2_0
    (int)
   CURL_HTTP_VERSION_2TLS
    (int)
   CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
    (int)
   CURLM_CALL_MULTI_PERFORM
    (int)
   CURLM_OK
    (int)
   CURLM_BAD_HANDLE
    (int)
   CURLM_BAD_EASY_HANDLE
    (int)
   CURLM_OUT_OF_MEMORY
    (int)
   CURLM_INTERNAL_ERROR
    (int)
   CURLMSG_DONE
    (int)
   CURLOPT_KEYPASSWD
    (int)
   CURLOPT_SSH_AUTH_TYPES
    (int)
   CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
    (int)
   CURLOPT_SSH_PRIVATE_KEYFILE
    (int)
   CURLOPT_SSH_PUBLIC_KEYFILE
    (int)
   CURLOPT_SSL_OPTIONS
    (int)
   CURLSSLOPT_ALLOW_BEAST
    (int)
   CURLSSLOPT_NO_REVOKE
    (int)
   CURLOPT_USERNAME
    (int)
   CURLOPT_SASL_IR
    (int)
   CURLOPT_DNS_INTERFACE
    (int)
   CURLOPT_DNS_LOCAL_IP4
    (int)
   CURLOPT_DNS_LOCAL_IP6
    (int)
   CURLOPT_XOAUTH2_BEARER
    (int)
   CURLOPT_LOGIN_OPTIONS
    (int)
   CURLOPT_EXPECT_100_TIMEOUT_MS
    (int)
   CURLOPT_SSL_ENABLE_ALPN
    (int)
   CURLOPT_SSL_ENABLE_NPN
    (int)
   CURLOPT_PINNEDPUBLICKEY
    (int)
   CURLOPT_UNIX_SOCKET_PATH
    (int)
   CURLOPT_SSL_VERIFYSTATUS
    (int)
   CURLOPT_PATH_AS_IS
    (int)
   CURLOPT_SSL_FALSESTART
    (int)
   CURLOPT_PIPEWAIT
    (int)
   CURLOPT_PROXY_SERVICE_NAME
    (int)
   CURLOPT_SERVICE_NAME
    (int)
   CURLOPT_DEFAULT_PROTOCOL
    (int)
   CURLOPT_STREAM_WEIGHT
    (int)
   CURLOPT_TFTP_NO_OPTIONS
    (int)
   CURLOPT_CONNECT_TO
    (int)
   CURLOPT_TCP_FASTOPEN
    (int)
   CURLOPT_TCP_KEEPALIVE
    (int)
   CURLOPT_TCP_KEEPIDLE
    (int)
   CURLOPT_TCP_KEEPINTVL
    (int)
   CURLMOPT_PIPELINING
    (int)
   CURLMOPT_MAXCONNECTS
    (int)
   CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE
    (int)
   CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE
    (int)
   CURLMOPT_MAX_HOST_CONNECTIONS
    (int)
   CURLMOPT_MAX_PIPELINE_LENGTH
    (int)
   CURLMOPT_MAX_TOTAL_CONNECTIONS
    (int)
   CURLMOPT_PUSHFUNCTION
    (int)
   CURLSSH_AUTH_AGENT
    (int)
   CURLSSH_AUTH_ANY
    (int)
   CURLSSH_AUTH_DEFAULT
    (int)
   CURLSSH_AUTH_HOST
    (int)
   CURLSSH_AUTH_KEYBOARD
    (int)
   CURLSSH_AUTH_NONE
    (int)
   CURLSSH_AUTH_PASSWORD
    (int)
   CURLSSH_AUTH_PUBLICKEY
    (int)
   CURLPAUSE_ALL
    (int)
   CURLPAUSE_CONT
    (int)
   CURLPAUSE_RECV
    (int)
   CURLPAUSE_RECV_CONT
    (int)
   CURLPAUSE_SEND
    (int)
   CURLPAUSE_SEND_CONT
    (int)
   CURLPIPE_NOTHING
    (int)
   CURLPIPE_HTTP1
    (int)
   CURLPIPE_MULTIPLEX
    (int)
   CURLPROXY_SOCKS4A
    (int)
   CURLPROXY_SOCKS5_HOSTNAME
    (int)
   CURLHEADER_SEPARATE
    (int)
   CURLHEADER_UNIFIED
    (int)
   CURLPROTO_SMB
    (int)
   CURLPROTO_SMBS
    (int)
   CURLOPT_REQUEST_TARGET
    (int)
   CURLAUTH_GSSAPI
    (int)
   CURLE_WEIRD_SERVER_REPLY
    (int)
   CURLINFO_CONTENT_LENGTH_DOWNLOAD_T
    (int)
   CURLINFO_CONTENT_LENGTH_UPLOAD_T
    (int)
   CURLINFO_HTTP_VERSION
    (int)
   CURLINFO_PROTOCOL
    (int)
   CURLINFO_PROXY_SSL_VERIFYRESULT
    (int)
   CURLINFO_SCHEME
    (int)
   CURLINFO_SIZE_DOWNLOAD_T
    (int)
   CURLINFO_SIZE_UPLOAD_T
    (int)
   CURLINFO_SPEED_DOWNLOAD_T
    (int)
   CURLINFO_SPEED_UPLOAD_T
    (int)
   CURL_MAX_READ_SIZE
    (int)
   CURLOPT_ABSTRACT_UNIX_SOCKET
    (int)
   CURLOPT_KEEP_SENDING_ON_ERROR
    (int)
   CURLOPT_PRE_PROXY
    (int)
   CURLOPT_PROXY_CAINFO
    (int)
   CURLOPT_PROXY_CAPATH
    (int)
   CURLOPT_PROXY_CRLFILE
    (int)
   CURLOPT_PROXY_KEYPASSWD
    (int)
   CURLOPT_PROXY_PINNEDPUBLICKEY
    (int)
   CURLOPT_PROXY_SSLCERT
    (int)
   CURLOPT_PROXY_SSLCERTTYPE
    (int)
   CURLOPT_PROXY_SSL_CIPHER_LIST
    (int)
   CURLOPT_PROXY_SSLKEY
    (int)
   CURLOPT_PROXY_SSLKEYTYPE
    (int)
   CURLOPT_PROXY_SSL_OPTIONS
    (int)
   CURLOPT_PROXY_SSL_VERIFYHOST
    (int)
   CURLOPT_PROXY_SSL_VERIFYPEER
    (int)
   CURLOPT_PROXY_SSLVERSION
    (int)
   CURLOPT_PROXY_TLSAUTH_PASSWORD
    (int)
   CURLOPT_PROXY_TLSAUTH_TYPE
    (int)
   CURLOPT_PROXY_TLSAUTH_USERNAME
    (int)
   CURLOPT_SOCKS5_AUTH
    (int)
   CURLOPT_SUPPRESS_CONNECT_HEADERS
    (int)
   CURLPROXY_HTTPS
    (int)
   CURL_SSLVERSION_MAX_DEFAULT
    (int)
   CURL_SSLVERSION_MAX_NONE
    (int)
   CURL_SSLVERSION_MAX_TLSv1_0
    (int)
   CURL_SSLVERSION_MAX_TLSv1_1
    (int)
   CURL_SSLVERSION_MAX_TLSv1_2
    (int)
   CURL_SSLVERSION_MAX_TLSv1_3
    (int)
   CURL_SSLVERSION_TLSv1_3
    (int)
   CURL_VERSION_HTTPS_PROXY
    (int)
   CURLAUTH_BEARER
    (int)
   CURLINFO_APPCONNECT_TIME_T
    (int)
   CURLINFO_CONNECT_TIME_T
    (int)
   CURLINFO_FILETIME_T
    (int)
   CURLINFO_NAMELOOKUP_TIME_T
    (int)
   CURLINFO_PRETRANSFER_TIME_T
    (int)
   CURLINFO_REDIRECT_TIME_T
    (int)
   CURLINFO_STARTTRANSFER_TIME_T
    (int)
   CURLINFO_TOTAL_TIME_T
    (int)
   CURL_LOCK_DATA_CONNECT
    (int)
   CURL_LOCK_DATA_PSL
    (int)
   CURLOPT_DISALLOW_USERNAME_IN_URL
    (int)
   CURLOPT_DNS_SHUFFLE_ADDRESSES
    (int)
   CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS
    (int)
   CURLOPT_HAPROXYPROTOCOL
    (int)
   CURLOPT_PROXY_TLS13_CIPHERS
    (int)
   CURLOPT_SSH_COMPRESSION
    (int)
   CURLOPT_TIMEVALUE_LARGE
    (int)
   CURLOPT_TLS13_CIPHERS
    (int)
   CURLSSH_AUTH_GSSAPI
    (int)
   CURLOPT_HTTP09_ALLOWED 
    (int)