PEAR Manual
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Net_Portscan

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Net_Portscan::checkPort() -- check for available service
Net_Portscan::checkPortRange() -- check for available services
Net_Portscan::getPort() -- port number of a service
Net_Portscan::getService() -- name of the service

Provides an API for scanning ports

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Net_POP3::numMsg()UpNet_Portscan::checkPort()