PHP Manual
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XLI. Network Functions

Table of Contents
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
debugger_on — Enable internal PHP debugger
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
openlog — Open connection to system logger
pfsockopen — Open persistent Internet or Unix domain socket connection
socket_set_blocking — Set blocking/non-blocking mode on a socket
syslog — Generate a system log message
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
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