PHP check and verify that the IP is a valid IP address function

PHP check and verify that the IP is a valid IP address function_PHP tutorial

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Release： 2016-07-13 16:57:43

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Before php5.2, if we want to verify whether the IP address is valid, we need to use regular expressions to verify whether the IP address is legal. If it is valid, we need to call ping to operate, but after php5.2.0, there is a special Functions are used to make this determination. Let me summarize these functions

to determine whether it is a legal IP

The code is as follows

代码如下	复制代码
if(filter_var($ip, FILTER_VALIDATE_IP)) {// it's valid }else {// it's not valid }

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if(filter_var($ip, FILTER_VALIDATE_IP)) {// it's valid

}else {// it's not valid

}

代码如下	复制代码
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {// it's valid }else {// it's not valid }

Determine whether it is a legal IPv4 IP address

代码如下	复制代码
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 \| FILTER_FLAG_NO_PRIV_RANGE)) {// it's valid }else {// it's not valid }

The code is as follows

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代码如下	复制代码
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE)) {// it's valid }else {// it's not valid }

if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {// it's valid

代码如下	复制代码
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE \| FILTER_FLAG_NO_RES_RANGE)) {// it's valid }else {// it's not valid }

}else {// it's not valid

}

代码如下	复制代码
//判断IP格式 function is_ip($gonten){ $ip = explode(".",$gonten); for($i=0;$i { if($ip[$i]>255){ return (0); } } return ereg("^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$",$gonten); }

Determine whether it is a legal public IPv4 address. Private IP addresses such as 192.168.1.1 will be excluded

The code is as follows

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if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE)) {// it's valid }else {// it's not valid } Determine whether it is a legal IPv6 address

The code is as follows

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if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE)) {// it's valid }else {// it's not valid } Determine whether it is a public IPv4 IP or a legal Public IPv6 IP address

The code is as follows

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if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {// it's valid }else {// it's not valid } If your PHP version is too low, none of the above functions can be used, but we can use regular expressions to verify

The code is as follows

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//Determine IP format function is_ip($gonten){ $ip = explode(".",$gonten); for($i=0;$i {<🎜> If($ip[$i]>255){ return (0); } } return ereg("^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$" ,$gonten); }