Question

How to validate an IP address with filter in PHP

Answer 1

/*
mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )
*/
   
$ip = "127.0.0.1";

if (!filter_var($ip, FILTER_VALIDATE_IP) === false)
    echo("$ip is a valid IP address");
else 
    echo("$ip is not a valid IP address");
        
/*
run:
    
127.0.0.1 is a valid IP address  
  
*/

 

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Answer 2

/*
mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )
*/
   
$ip = "127.0.0.1.1";

if (!filter_var($ip, FILTER_VALIDATE_IP) === false)
    echo("$ip is a valid IP address");
else 
    echo("$ip is not a valid IP address");
        
/*
run:
    
127.0.0.1.1 is not a valid IP address 
  
*/

 

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