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$ip = "192.0.34.166"; $long = ip2long($ip); echo $ip . "\n"; // 192.0.34.166 echo $long . "\n"; // -1073732954 printf("%u\n", ip2long($ip)); // 3221234342
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上面的PHP中ip2long的使用方法,我们会发现,有些ip转化成整数后,是负的,这是因为得到的结果是有符号整型,最大值是2147483647.要把它转化为无符号的。
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$gateway = "192.168.1.1"; $netmask = "255.255.255.0"; //网络地址 $ip1 = ip2long($gateway) & ip2long($netmask); //广播地址 $ip2 = ip2long($gateway) | (~ip2long($netmask));
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在javascript当中实现ip2long和long2ip,需要对网络上流传的代码做一些改写,将ip2long的无符号转成有符号,将long2ip的有符号转成无符号,代码如下:
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function ip2long ( ip_address ) { var output = false; if ( ip_address.match ( /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/ ) ) { var parts = ip_address.split ( '.' ); var output = 0; output = ( parts [ 0 ] * Math.pow ( 256, 3 ) ) + ( parts [ 1 ] * Math.pow ( 256, 2 ) ) + ( parts [ 2 ] * Math.pow ( 256, 1 ) ) + ( parts [ 3 ] * Math.pow ( 256, 0 ) ); } return output<<0; } function long2ip ( proper_address ) { proper_address = proper_address>>>0; var output = false; if ( !isNaN ( proper_address ) && ( proper_address >= 0 || proper_address <= 4294967295 ) ) { output = Math.floor (proper_address / Math.pow ( 256, 3 ) ) + '.' + Math.floor ( ( proper_address % Math.pow ( 256, 3 ) ) / Math.pow ( 256, 2 ) ) + '.' + Math.floor ( ( ( proper_address % Math.pow ( 256, 3 ) ) % Math.pow ( 256, 2 ) ) / Math.pow ( 256, 1 ) ) + '.' + Math.floor ( ( ( ( proper_address % Math.pow ( 256, 3 ) ) % Math.pow ( 256, 2 ) ) % Math.pow ( 256, 1 ) ) / Math.pow ( 256, 0 ) ); } return output; }?