Question

i have a textarea:

<form action="index.php" method="post">
<textarea name="test" rows="20" cols="20"></textarea>
<input type="submit" />
</form>

i want to type 195.2.2.13/16 and PHP should give me a list like that:

195.2.2.13
195.2.2.14
195.2.2.15
195.2.2.16

how can i do it with PHP?

Answer 1

I noticed that the code posted originally was fine for two decimal points but just incase you need to use 3 the below should work fine.

$input = "195.2.2.13/100";

function ipRange( $input ) {
    $input = explode( "/", $input );
        $numerator = substr( strrchr( $input[0], "." ), 1,  3 );
        $denominator = $input[1];
            $num = strlen( $numerator );
        $range = substr( $input[0], 0, -$num );

    while ( $numerator <= $denominator ) {
        echo $range.$numerator."<br />\n\r";
        $numerator++;
    }
}

// Call function
ipRange($input);