PHP Check Verify IP is valid IP address function _php Tutorial

Before php5.2 if we want to verify that the IP address is valid we need to use the regular to verify that this is only the IP address is not legal, if it is valid we need to call Ping to operate, but after php5.2.0, there is a special function to do this judgment, let me summarize these functions

Determine if it is a legitimate IP

The code is as follows	Copy Code
if (Filter_var ($ip, filter_validate_ip)) {//it ' s valid }else {//It ' s not valid }

Determine if the IPV4 IP address is valid

The code is as follows	Copy Code
if (Filter_var ($ip, Filter_validate_ip, Filter_flag_ipv4)) {//it ' s valid }else {//It ' s not valid }

Determine if it is a valid public IPv4 address, 192.168.1.1 This type of private IP address will be excluded

The code is as follows	Copy Code
if (Filter_var ($ip, filter_validate_ip, Filter_flag_ipv4 | Filter_flag_no_priv_range)) {//it ' s valid }else {//It ' s not valid }

Determine if the IPV6 address is valid

The code is as follows	Copy Code
if (Filter_var ($ip, Filter_validate_ip, Filter_flag_no_res_range)) {//it ' s valid }else {//It ' s not valid }

Determines whether the public IPv4 IP or is a legitimate public IPv6 IP address

The code is as follows	Copy Code
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 you can use the above function but we can use regular expressions to verify

The code is as follows	Copy Code
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); }

http://www.bkjia.com/PHPjc/631494.html www.bkjia.com true http://www.bkjia.com/PHPjc/631494.html techarticle before php5.2 if we want to verify that the IP address is valid we need to use the regular to verify that this is only the IP address is not legal, if it is valid we need to call Ping to operate, but ...

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