[PHP] php function - netmask validity check

[S H A N]

hi,

while using ipman php script and come accross this problem...

function ip_mask_valid($mask)
{
   $maskroot = (int)sqrt(abs(ip2long($mask)));
   return ( (float)$maskroot == sqrt(abs(ip2long($mask))) );
}

this function is not returning true/successfull output when say given
255.255.254.0 netmask. pls assist.

rgds,

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