Network Functions





本扩展模块作为 PHP 内核的一部分,无需安装即可使用。


这些函数的行为受 php.ini 的影响。

表 170. Network Configuration Options


有关 PHP_INI_* 常量进一步的细节与定义参见附录 G, php.ini 配置选项


define_syslog_variables boolean

Whether or not to define the various syslog variables (e.g. $LOG_PID, $LOG_CRON, etc.). Turning it off is a good idea performance-wise. At runtime, you can define these variables by calling define_syslog_variables().




以下常量作为 PHP 核心的一部分一直有效。

表 171. openlog() Options

LOG_CONS if there is an error while sending data to the system logger, write directly to the system console
LOG_NDELAY open the connection to the logger immediately
LOG_ODELAY (default) delay opening the connection until the first message is logged
LOG_PERRORprint log message also to standard error
LOG_PIDinclude PID with each message

表 172. openlog() Facilities

LOG_AUTH security/authorization messages (use LOG_AUTHPRIV instead in systems where that constant is defined)
LOG_AUTHPRIVsecurity/authorization messages (private)
LOG_CRONclock daemon (cron and at)
LOG_DAEMONother system daemons
LOG_KERNkernel messages
LOG_LOCAL0 ... LOG_LOCAL7reserved for local use, these are not available in Windows
LOG_LPRline printer subsystem
LOG_MAILmail subsystem
LOG_NEWSUSENET news subsystem
LOG_SYSLOGmessages generated internally by syslogd
LOG_USERgeneric user-level messages
LOG_UUCPUUCP subsystem

表 173. syslog() Priorities (in descending order)

LOG_EMERGsystem is unusable
LOG_ALERTaction must be taken immediately
LOG_CRITcritical conditions
LOG_ERRerror conditions
LOG_WARNINGwarning conditions
LOG_NOTICEnormal, but significant, condition
LOG_INFOinformational message
LOG_DEBUGdebug-level message

表 174. dns_get_record() Options

DNS_AIPv4 Address Resource
DNS_MXMail Exchanger Resource
DNS_CNAMEAlias (Canonical Name) Resource
DNS_NSAuthoritative Name Server Resource
DNS_PTRPointer Resource
DNS_HINFOHost Info Resource (See IANA's » Operating System Names for the meaning of these values)
DNS_SOAStart of Authority Resource
DNS_TXTText Resource
DNS_ANYAny Resource Record. On most systems this returns all resource records, however it should not be counted upon for critical uses. Try DNS_ALL instead.
DNS_AAAAIPv6 Address Resource
DNS_ALLIteratively query the name server for each available record type.


checkdnsrr - Check DNS records corresponding to a given Internet host name or IP address
closelog - Close connection to system logger
debugger_off - Disable internal PHP debugger (PHP 3)
debugger_on - Enable internal PHP debugger (PHP 3)
define_syslog_variables - Initializes all syslog related constants
dns_check_record - Synonym for checkdnsrr
dns_get_mx - Synonym for getmxrr
dns_get_record - Fetch DNS Resource Records associated with a hostname
fsockopen - Open Internet or Unix domain socket connection
gethostbyaddr - Get the Internet host name corresponding to a given IP address
gethostbyname - Get the IP address corresponding to a given Internet host name
gethostbynamel - Get a list of IP addresses corresponding to a given Internet host name
getmxrr - Get MX records corresponding to a given Internet host name
getprotobyname - Get protocol number associated with protocol name
getprotobynumber - Get protocol name associated with protocol number
getservbyname - Get port number associated with an Internet service and protocol
getservbyport - Get Internet service which corresponds to port and protocol
inet_ntop - Converts a packed internet address to a human readable representation
inet_pton - Converts a human readable IP address to its packed in_addr representation
ip2long - Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address
long2ip - Converts an (IPv4) Internet network address into a string in Internet standard dotted format
openlog - Open connection to system logger
pfsockopen - Open persistent Internet or Unix domain socket connection
socket_get_status - 别名 stream_get_meta_data
socket_set_blocking - 别名 stream_set_blocking
socket_set_timeout - 别名 stream_set_timeout
syslog - Generate a system log message