The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
Descriptions and uses for these constants are described within the curl_setopt(), curl_multi_setopt() and curl_getinfo() documentation.
CURLOPT_AUTOREFERER
(integer)
CURLOPT_DNS_USE_GLOBAL_CACHE
(integer)
CURLOPT_DNS_CACHE_TIMEOUT
(integer)
CURLOPT_FTP_SSL
(integer)
CURLFTP_CREATE_DIR
(integer)
CURLFTP_CREATE_DIR_NONE
(integer)
CURLFTP_CREATE_DIR_RETRY
(integer)
CURLFTPSSL_TRY
(integer)
CURLFTPSSL_ALL
(integer)
CURLFTPSSL_CONTROL
(integer)
CURLFTPSSL_NONE
(integer)
CURLOPT_PRIVATE
(integer)
CURLOPT_FTPSSLAUTH
(integer)
CURLOPT_PORT
(integer)
CURLOPT_FILE
(integer)
CURLOPT_INFILE
(integer)
CURLOPT_INFILESIZE
(integer)
CURLOPT_URL
(integer)
CURLOPT_PROXY
(integer)
CURLOPT_VERBOSE
(integer)
CURLOPT_HEADER
(integer)
CURLOPT_HTTPHEADER
(integer)
CURLOPT_NOPROGRESS
(integer)
CURLOPT_NOBODY
(integer)
CURLOPT_FAILONERROR
(integer)
CURLOPT_UPLOAD
(integer)
CURLOPT_POST
(integer)
CURLOPT_FTPLISTONLY
(integer)
CURLOPT_FTPAPPEND
(integer)
CURLOPT_FTP_CREATE_MISSING_DIRS
(integer)
CURLOPT_NETRC
(integer)
CURLOPT_FOLLOWLOCATION
(integer)
CURLOPT_FTPASCII
(integer)
CURLOPT_PUT
(integer)
CURLOPT_MUTE
(integer)
CURLOPT_USERPWD
(integer)
CURLOPT_PROXYUSERPWD
(integer)
CURLOPT_RANGE
(integer)
CURLOPT_TIMEOUT
(integer)
CURLOPT_TIMEOUT_MS
(integer)
CURLOPT_TCP_NODELAY
(integer)
CURLOPT_POSTFIELDS
(integer)
CURLOPT_PROGRESSFUNCTION
(integer)
CURLOPT_REFERER
(integer)
CURLOPT_USERAGENT
(integer)
CURLOPT_FTPPORT
(integer)
CURLOPT_FTP_USE_EPSV
(integer)
CURLOPT_LOW_SPEED_LIMIT
(integer)
CURLOPT_LOW_SPEED_TIME
(integer)
CURLOPT_RESUME_FROM
(integer)
CURLOPT_SSLCERT
(integer)
CURLOPT_SSLCERTPASSWD
(integer)
CURLOPT_WRITEHEADER
(integer)
CURLOPT_SSL_VERIFYHOST
(integer)
CURLOPT_SSLVERSION
(integer)
CURL_SSLVERSION_DEFAULT
(integer)
CURL_SSLVERSION_TLSv1
(integer)
CURL_SSLVERSION_SSLv2
(integer)
CURL_SSLVERSION_SSLv3
(integer)
CURL_SSLVERSION_TLSv1_0
(integer)
CURL_SSLVERSION_TLSv1_1
(integer)
CURL_SSLVERSION_TLSv1_2
(integer)
CURLOPT_TIMECONDITION
(integer)
CURLOPT_TIMEVALUE
(integer)
CURLOPT_CUSTOMREQUEST
(integer)
CURLOPT_STDERR
(integer)
CURLOPT_TRANSFERTEXT
(integer)
CURLOPT_RETURNTRANSFER
(integer)
CURLOPT_QUOTE
(integer)
CURLOPT_POSTQUOTE
(integer)
CURLOPT_INTERFACE
(integer)
CURLOPT_KRB4LEVEL
(integer)
CURLOPT_HTTPPROXYTUNNEL
(integer)
CURLOPT_FILETIME
(integer)
CURLOPT_WRITEFUNCTION
(integer)
CURLOPT_READFUNCTION
(integer)
CURLOPT_PASSWDFUNCTION
(integer)
CURLOPT_HEADERFUNCTION
(integer)
CURLOPT_MAXREDIRS
(integer)
CURLOPT_MAXCONNECTS
(integer)
CURLOPT_CLOSEPOLICY
(integer)
CURLOPT_FRESH_CONNECT
(integer)
CURLOPT_FORBID_REUSE
(integer)
CURLOPT_RANDOM_FILE
(integer)
CURLOPT_EGDSOCKET
(integer)
CURLOPT_CONNECTTIMEOUT
(integer)
CURLOPT_CONNECTTIMEOUT_MS
(integer)
CURLOPT_SSL_VERIFYPEER
(integer)
CURLOPT_CAINFO
(integer)
CURLOPT_CAPATH
(integer)
CURLOPT_SSL_CIPHER_LIST
(integer)
CURLOPT_BINARYTRANSFER
(integer)
CURLOPT_NOSIGNAL
(integer)
CURLOPT_PROXYTYPE
(integer)
CURLOPT_BUFFERSIZE
(integer)
CURLOPT_HTTPGET
(integer)
CURLOPT_HTTP_VERSION
(integer)
CURLOPT_SSLKEY
(integer)
CURLOPT_SSLKEYTYPE
(integer)
CURLOPT_SSLKEYPASSWD
(integer)
CURLOPT_SSLENGINE
(integer)
CURLOPT_SSLENGINE_DEFAULT
(integer)
CURLOPT_SSLCERTTYPE
(integer)
CURLOPT_CRLF
(integer)
CURLOPT_ENCODING
(integer)
CURLOPT_PROXYPORT
(integer)
CURLOPT_UNRESTRICTED_AUTH
(integer)
CURLOPT_FTP_USE_EPRT
(integer)
CURLOPT_HTTP200ALIASES
(integer)
CURLOPT_HTTPAUTH
(integer)
CURLAUTH_BASIC
(integer)
CURLAUTH_DIGEST
(integer)
CURLAUTH_GSSNEGOTIATE
(integer)
CURLAUTH_NEGOTIATE
(integer)
CURLAUTH_NTLM
(integer)
CURLAUTH_NTLM_WB
(integer)
CURLAUTH_ANY
(integer)
CURLAUTH_ANYSAFE
(integer)
CURLOPT_PROXYAUTH
(integer)
CURLOPT_MAX_RECV_SPEED_LARGE
(integer)
CURLOPT_MAX_SEND_SPEED_LARGE
(integer)
CURLOPT_HEADEROPT
(integer)
CURLOPT_PROXYHEADER
(integer)
CURLCLOSEPOLICY_LEAST_RECENTLY_USED
(integer)
CURLCLOSEPOLICY_LEAST_TRAFFIC
(integer)
CURLCLOSEPOLICY_SLOWEST
(integer)
CURLCLOSEPOLICY_CALLBACK
(integer)
CURLCLOSEPOLICY_OLDEST
(integer)
CURLINFO_PRIVATE
(integer)
CURLINFO_EFFECTIVE_URL
(integer)
CURLINFO_HTTP_CODE
(integer)
CURLINFO_RESPONSE_CODE
CURLINFO_RESPONSE_CODE
(integer)
CURLINFO_HEADER_OUT
(integer)
CURLINFO_HEADER_SIZE
(integer)
CURLINFO_REQUEST_SIZE
(integer)
CURLINFO_TOTAL_TIME
(integer)
CURLINFO_NAMELOOKUP_TIME
(integer)
CURLINFO_CONNECT_TIME
(integer)
CURLINFO_PRETRANSFER_TIME
(integer)
CURLINFO_SIZE_UPLOAD
(integer)
CURLINFO_SIZE_DOWNLOAD
(integer)
CURLINFO_SPEED_DOWNLOAD
(integer)
CURLINFO_SPEED_UPLOAD
(integer)
CURLINFO_FILETIME
(integer)
CURLINFO_SSL_VERIFYRESULT
(integer)
CURLINFO_CONTENT_LENGTH_DOWNLOAD
(integer)
CURLINFO_CONTENT_LENGTH_UPLOAD
(integer)
CURLINFO_STARTTRANSFER_TIME
(integer)
CURLINFO_CONTENT_TYPE
(integer)
CURLINFO_REDIRECT_TIME
(integer)
CURLINFO_REDIRECT_COUNT
(integer)
CURLINFO_REDIRECT_URL
(string)
CURLINFO_PRIMARY_IP
(string)
CURLINFO_PRIMARY_PORT
(integer)
CURLINFO_LOCAL_IP
(string)
CURLINFO_LOCAL_PORT
(integer)
CURL_PUSH_OK
(integer)
CURL_PUSH_DENY
(integer)
CURL_REDIR_POST_301
(integer)
CURL_REDIR_POST_302
(integer)
CURL_REDIR_POST_303
(integer)
CURL_REDIR_POST_ALL
(integer)
CURL_TIMECOND_IFMODSINCE
(integer)
CURL_TIMECOND_IFUNMODSINCE
(integer)
CURL_TIMECOND_LASTMOD
(integer)
CURL_VERSION_IPV6
(integer)
CURL_VERSION_KERBEROS4
(integer)
CURL_VERSION_KERBEROS5
(integer)
CURL_VERSION_HTTP2
(integer)
CURL_VERSION_PSL
(integer)
CURL_VERSION_SSL
(integer)
CURL_VERSION_UNIX_SOCKETS
(integer)
CURL_VERSION_LIBZ
(integer)
CURLVERSION_NOW
(integer)
CURLE_OK
(integer)
CURLE_UNSUPPORTED_PROTOCOL
(integer)
CURLE_FAILED_INIT
(integer)
CURLE_URL_MALFORMAT
(integer)
CURLE_URL_MALFORMAT_USER
(integer)
CURLE_COULDNT_RESOLVE_PROXY
(integer)
CURLE_COULDNT_RESOLVE_HOST
(integer)
CURLE_COULDNT_CONNECT
(integer)
CURLE_FTP_WEIRD_SERVER_REPLY
(integer)
CURLE_FTP_ACCESS_DENIED
(integer)
CURLE_FTP_USER_PASSWORD_INCORRECT
(integer)
CURLE_FTP_WEIRD_PASS_REPLY
(integer)
CURLE_FTP_WEIRD_USER_REPLY
(integer)
CURLE_FTP_WEIRD_PASV_REPLY
(integer)
CURLE_FTP_WEIRD_227_FORMAT
(integer)
CURLE_FTP_CANT_GET_HOST
(integer)
CURLE_FTP_CANT_RECONNECT
(integer)
CURLE_FTP_COULDNT_SET_BINARY
(integer)
CURLE_PARTIAL_FILE
(integer)
CURLE_FTP_COULDNT_RETR_FILE
(integer)
CURLE_FTP_WRITE_ERROR
(integer)
CURLE_FTP_QUOTE_ERROR
(integer)
CURLE_HTTP_NOT_FOUND
(integer)
CURLE_WRITE_ERROR
(integer)
CURLE_MALFORMAT_USER
(integer)
CURLE_FTP_COULDNT_STOR_FILE
(integer)
CURLE_READ_ERROR
(integer)
CURLE_OUT_OF_MEMORY
(integer)
CURLE_OPERATION_TIMEOUTED
(integer)
CURLE_FTP_COULDNT_SET_ASCII
(integer)
CURLE_FTP_PORT_FAILED
(integer)
CURLE_FTP_COULDNT_USE_REST
(integer)
CURLE_FTP_COULDNT_GET_SIZE
(integer)
CURLE_HTTP_RANGE_ERROR
(integer)
CURLE_HTTP_POST_ERROR
(integer)
CURLE_SSL_CONNECT_ERROR
(integer)
CURLE_FTP_BAD_DOWNLOAD_RESUME
(integer)
CURLE_FILE_COULDNT_READ_FILE
(integer)
CURLE_LDAP_CANNOT_BIND
(integer)
CURLE_LDAP_SEARCH_FAILED
(integer)
CURLE_LIBRARY_NOT_FOUND
(integer)
CURLE_FUNCTION_NOT_FOUND
(integer)
CURLE_ABORTED_BY_CALLBACK
(integer)
CURLE_BAD_FUNCTION_ARGUMENT
(integer)
CURLE_BAD_CALLING_ORDER
(integer)
CURLE_HTTP_PORT_FAILED
(integer)
CURLE_BAD_PASSWORD_ENTERED
(integer)
CURLE_TOO_MANY_REDIRECTS
(integer)
CURLE_UNKNOWN_TELNET_OPTION
(integer)
CURLE_TELNET_OPTION_SYNTAX
(integer)
CURLE_OBSOLETE
(integer)
CURLE_SSL_PEER_CERTIFICATE
(integer)
CURLE_GOT_NOTHING
(integer)
CURLE_SSL_ENGINE_NOTFOUND
(integer)
CURLE_SSL_ENGINE_SETFAILED
(integer)
CURLE_SEND_ERROR
(integer)
CURLE_RECV_ERROR
(integer)
CURLE_SSL_CERTPROBLEM
(integer)
CURLE_SSL_CIPHER
(integer)
CURLE_SSL_CACERT
(integer)
CURLE_BAD_CONTENT_ENCODING
(integer)
CURLE_LDAP_INVALID_URL
(integer)
CURLE_FILESIZE_EXCEEDED
(integer)
CURLE_FTP_SSL_FAILED
(integer)
CURLE_SSH
(integer)
CURLFTPAUTH_DEFAULT
(integer)
CURLFTPAUTH_SSL
(integer)
CURLFTPAUTH_TLS
(integer)
CURLPROXY_HTTP
(integer)
CURLPROXY_HTTP_1_0
(integer)
CURLPROXY_SOCKS4
(integer)
CURLPROXY_SOCKS5
(integer)
CURL_NETRC_OPTIONAL
(integer)
CURL_NETRC_IGNORED
(integer)
CURL_NETRC_REQUIRED
(integer)
CURL_HTTP_VERSION_NONE
(integer)
CURL_HTTP_VERSION_1_0
(integer)
CURL_HTTP_VERSION_1_1
(integer)
CURL_HTTP_VERSION_2
(integer)
CURL_HTTP_VERSION_2TLS
(integer)
CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
(integer)
CURLM_CALL_MULTI_PERFORM
(integer)
CURLM_OK
(integer)
CURLM_BAD_HANDLE
(integer)
CURLM_BAD_EASY_HANDLE
(integer)
CURLM_OUT_OF_MEMORY
(integer)
CURLM_INTERNAL_ERROR
(integer)
CURLMSG_DONE
(integer)
CURLOPT_KEYPASSWD
(integer)
CURLOPT_SSH_AUTH_TYPES
(integer)
CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
(integer)
CURLOPT_SSH_PRIVATE_KEYFILE
(integer)
CURLOPT_SSH_PUBLIC_KEYFILE
(integer)
CURLOPT_SSL_OPTIONS
(integer)
CURLSSLOPT_ALLOW_BEAST
(integer)
CURLSSLOPT_NO_REVOKE
(integer)
CURLOPT_USERNAME
(integer)
CURLOPT_SASL_IR
(integer)
CURLOPT_DNS_INTERFACE
(integer)
CURLOPT_DNS_LOCAL_IP4
(integer)
CURLOPT_DNS_LOCAL_IP6
(integer)
CURLOPT_XOAUTH2_BEARER
(integer)
CURLOPT_LOGIN_OPTIONS
(integer)
CURLOPT_EXPECT_100_TIMEOUT_MS
(integer)
CURLOPT_SSL_ENABLE_ALPN
(integer)
CURLOPT_SSL_ENABLE_NPN
(integer)
CURLOPT_PINNEDPUBLICKEY
(integer)
CURLOPT_UNIX_SOCKET_PATH
(integer)
CURLOPT_SSL_VERIFYSTATUS
(integer)
CURLOPT_PATH_AS_IS
(integer)
CURLOPT_SSL_FALSESTART
(integer)
CURLOPT_PIPEWAIT
(integer)
CURLOPT_PROXY_SERVICE_NAME
(integer)
CURLOPT_SERVICE_NAME
(integer)
CURLOPT_DEFAULT_PROTOCOL
(integer)
CURLOPT_STREAM_WEIGHT
(integer)
CURLOPT_TFTP_NO_OPTIONS
(integer)
CURLOPT_CONNECT_TO
(integer)
CURLOPT_TCP_FASTOPEN
(integer)
CURLMOPT_PIPELINING
(integer)
CURLMOPT_MAXCONNECTS
(integer)
CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE
(integer)
CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE
(integer)
CURLMOPT_MAX_HOST_CONNECTIONS
(integer)
CURLMOPT_MAX_PIPELINE_LENGTH
(integer)
CURLMOPT_MAX_TOTAL_CONNECTIONS
(integer)
CURLMOPT_PUSHFUNCTION
(integer)
CURLSSH_AUTH_AGENT
(integer)
CURLSSH_AUTH_ANY
(integer)
CURLSSH_AUTH_DEFAULT
(integer)
CURLSSH_AUTH_HOST
(integer)
CURLSSH_AUTH_KEYBOARD
(integer)
CURLSSH_AUTH_NONE
(integer)
CURLSSH_AUTH_PASSWORD
(integer)
CURLSSH_AUTH_PUBLICKEY
(integer)
CURL_WRAPPERS_ENABLED
(integer)
CURLPAUSE_ALL
(integer)
CURLPAUSE_CONT
(integer)
CURLPAUSE_RECV
(integer)
CURLPAUSE_RECV_CONT
(integer)
CURLPAUSE_SEND
(integer)
CURLPAUSE_SEND_CONT
(integer)
CURLPIPE_NOTHING
(integer)
CURLPIPE_HTTP1
(integer)
CURLPIPE_MULTIPLEX
(integer)
CURLPROXY_SOCKS4A
(integer)
CURLPROXY_SOCKS5_HOSTNAME
(integer)
CURLHEADER_SEPARATE
(integer)
CURLHEADER_UNIFIED
(integer)
CURLPROTO_SMB
(integer)
CURLPROTO_SMBS
(integer)
CURLOPT_REQUEST_TARGET
(integer)
CURLAUTH_GSSAPI
(integer)
CURLE_WEIRD_SERVER_REPLY
(integer)
CURLINFO_CONTENT_LENGTH_DOWNLOAD_T
(integer)
CURLINFO_CONTENT_LENGTH_UPLOAD_T
(integer)
CURLINFO_HTTP_VERSION
(integer)
CURLINFO_PROTOCOL
(integer)
CURLINFO_PROXY_SSL_VERIFYRESULT
(integer)
CURLINFO_SCHEME
(integer)
CURLINFO_SIZE_DOWNLOAD_T
(integer)
CURLINFO_SIZE_UPLOAD_T
(integer)
CURLINFO_SPEED_DOWNLOAD_T
(integer)
CURLINFO_SPEED_UPLOAD_T
(integer)
CURL_MAX_READ_SIZE
(integer)
CURLOPT_ABSTRACT_UNIX_SOCKET
(integer)
CURLOPT_KEEP_SENDING_ON_ERROR
(integer)
CURLOPT_PRE_PROXY
(integer)
CURLOPT_PROXY_CAINFO
(integer)
CURLOPT_PROXY_CAPATH
(integer)
CURLOPT_PROXY_CRLFILE
(integer)
CURLOPT_PROXY_KEYPASSWD
(integer)
CURLOPT_PROXY_PINNEDPUBLICKEY
(integer)
CURLOPT_PROXY_SSLCERT
(integer)
CURLOPT_PROXY_SSLCERTTYPE
(integer)
CURLOPT_PROXY_SSL_CIPHER_LIST
(integer)
CURLOPT_PROXY_SSLKEY
(integer)
CURLOPT_PROXY_SSLKEYTYPE
(integer)
CURLOPT_PROXY_SSL_OPTIONS
(integer)
CURLOPT_PROXY_SSL_VERIFYHOST
(integer)
CURLOPT_PROXY_SSL_VERIFYPEER
(integer)
CURLOPT_PROXY_SSLVERSION
(integer)
CURLOPT_PROXY_TLSAUTH_PASSWORD
(integer)
CURLOPT_PROXY_TLSAUTH_TYPE
(integer)
CURLOPT_PROXY_TLSAUTH_USERNAME
(integer)
CURLOPT_SOCKS5_AUTH
(integer)
CURLOPT_SUPPRESS_CONNECT_HEADERS
(integer)
CURLPROXY_HTTPS
(integer)
CURL_SSLVERSION_MAX_DEFAULT
(integer)
CURL_SSLVERSION_MAX_NONE
(integer)
CURL_SSLVERSION_MAX_TLSv1_0
(integer)
CURL_SSLVERSION_MAX_TLSv1_1
(integer)
CURL_SSLVERSION_MAX_TLSv1_2
(integer)
CURL_SSLVERSION_MAX_TLSv1_3
(integer)
CURL_SSLVERSION_TLSv1_3
(integer)
CURL_VERSION_HTTPS_PROXY
(integer)