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SaigyoujiYuyuko233/php-netmask2Cidr.php

Created May 7, 2020 16:00
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Covert netmask(255.255.255.0) to cidr(/24)
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php-netmask2Cidr.php
function netmask2Cidr($startIP = "10.198.12.0", $endIP = "10.198.12.255") {
$margin = strlen(decbin((ip2long($endIP) - ip2long($startIP))));
$netmask = decbin(0xFFFFFFFF << $margin & 0xFFFFFFFF);
return substr_count($netmask, "1");
}
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