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@ 2014-03-31T05:32:00Z

<?php
list($ip1, $ip2, $ip3, $ip4) = explode('.', '255.35.101.15');
$ip = ($ip1<<24)|($ip2<<16)|($ip3<<8)|($ip4); 
echo sprintf('%u', $ip);

Output
Performance
VLD
References
Branches

explode: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

48.01 ms | 402 KiB | 5 Q