CURL_HTTP_VERSION_3
CURL_HTTP_VERSION_3ONLY
CURL_TCP_KEEPCNT
CURLOPT_PREREQFUNCTION
CURL_PREREQFUNC_OK
CURL_PREREQFUNC_ABORT
CURLOPT_SERVER_RESPONSE_TIMEOUT
CURLOPT_DEBUGFUNCTION
CURLINFO_TEXT
CURLINFO_HEADER_IN
CURLINFO_DATA_IN
CURLINFO_DATA_OUT
CURLINFO_SSL_DATA_OUT
CURLINFO_SSL_DATA_IN
CURLINFO_POSTTRANSFER_TIME_T
PATTERN
(IntlDateFormatter)
PROPERTY_IDS_UNARY_OPERATOR
(IntlChar)
PROPERTY_ID_COMPAT_MATH_START
PROPERTY_ID_COMPAT_MATH_CONTINUE
LDAP_OPT_X_TLS_PROTOCOL_MAX
LDAP_OPT_X_TLS_PROTOCOL_TLS1_3
LIBXML_RECOVER
LIBXML_NO_XXE。当需要执行实体替换时，此常量与 LIBXML_NOENT
一起使用，通知禁止加载外部实体。此常量自 libxml2 2.13 起可用。
MYSQLI_TYPE_VECTOR
X509_PURPOSE_OCSP_HELPERX509_PURPOSE_TIMESTAMP_SIGN现在如果支持，则会定义以下套接字选项：
SO_EXCLUSIVEADDRUSE (Windows only)
SOCK_CONN_DGRAM (NetBSD only)
SOCK_DCCP (NetBSD only)
TCP_SYNCNT (Linux only)
SO_EXCLBIND (Solaris/Illumos only)
SO_NOSIGPIPE (macOS and FreeBSD)
SO_LINGER_SEC (macOS only)
IP_PORTRANGE (FreeBSD/NetBSD/OpenBSD only)
IP_PORTRANGE_DEFAULT (FreeBSD/NetBSD/OpenBSD only)
IP_PORTRANGE_HIGH (FreeBSD/NetBSD/OpenBSD only)
IP_PORTRANGE_LOW (FreeBSD/NetBSD/OpenBSD only)
SOCK_NONBLOCK
SOCK_CLOEXEC
SO_BINDTOIFINDEX
XML_OPTION_PARSE_HUGE
允许使用 xml_parse() 和
xml_parse_into_struct()
解析大输入。