使用PHP自動PING IP，校檢網絡連接是否正常！

國外一位大師使用Sockets Ping，似乎效率更高：

PHP代碼

<?php // Checksum calculation function function icmpChecksum($data) { if (strlen($data)%2) $data .= "/x00"; $bit = unpack('n*', $data); $sum = array_sum($bit); while ($sum >> 16) $sum = ($sum >> 16) + ($sum & 0xffff); return pack('n*', ~$sum); } // Making the package $type= "/x08"; $code= "/x00"; $checksum= "/x00/x00"; $identifier = "/x00/x00"; $seqNumber = "/x00/x00"; $data= "Scarface"; $package = $type.$code.$checksum.$identifier.$seqNumber.$data; $checksum = icmpChecksum($package); // Calculate the checksum $package = $type.$code.$checksum.$identifier.$seqNumber.$data; // And off to the sockets $socket = socket_create(AF_INET, SOCK_RAW, 1); socket_connect($socket, "www.google.com", null); // If you're using below PHP 5, see the manual for the microtime_float // function. Instead of just using the m // icrotime() function. $startTime = microtime(true); socket_send($socket, $package, strLen($package), 0); if (socket_read($socket, 255)) { echo round(microtime(true) - $startTime, 4) .' seconds'; } socket_close($socket); ?>

總結

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