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PHP find output programs (Filters) | set 2

Find the output of PHP programs | Filters | Set 2: Enhance the knowledge of PHP Filters by solving and finding the output of some PHP programs.
Submitted by Nidhi, on January 26, 2021

Question 1:

<?php
    $IP = "2021:0abd:85c4:09d2:2219:3b2e:4e70:6234";
    $isValid = filter_var($IP, FILTER_VALIDATE_IPV6);
    
    if ($isValid == true) echo "IP address is valid<br>";
    else echo "IP address is not valid<br>";
?>

Output:

IP address is not valid

Explanation:

In the above program, we created $IP initialized with a valid IPV6 address. But we did not use filter properly in filter_var() function to validate IPv6 address. The correct way is given below:

$isValid = filter_var($IP, FILTER_VALIDATE_IP,FILTER_VALIDATE_IPV6);

The above function will return true, If $IP contains a valid IPv6 address, otherwise it will return false. In our case we did not use filters properly, then "IP address is not valid" will be printed on the webpage.

Question 2:

<?php
    $URL = "https://www.includehelp.com?A=10&B=20";
    $isValid = filter_var($URL, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED);
    
    if ($isValid == true) echo ("Given URL is a valid URL with a query string");
    else echo ("Given URL is not a valid URL with a query string");
?>

Output:

Given URL is a valid URL with a query string

Explanation:

The above program will print "Given URL is a valid URL with a query string" on the webpage. Here, we created variable $URL and initialized with "https://www.includehelp.com?A=10&B=20", here we also used 'A' and 'B' for query-string in the given URL.

$isValid = filter_var($URL, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED);

The above function will return true, because we used URL with query-string then "Given URL is a valid URL with a query string" will print on the webpage.

Question 3:

<?php
    $A = "<h2>";
    $B = "IncludeHelp";
    $C = "ÆØÅ!";
    $D = "<h2>";
    
    $S = $A . $B . $C . $D;
    
    $R_S = filter_var($S, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);
    echo $R_S;
?>

Output:

IncludeHelp!

Explanation:

In the above program, we created variable $A, $B, $C, and $D and initialized with some values. Then we concatenate all variables and assigned to $S.

$R_S = filter_var($S, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);

The above statemment used FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH filters that will remove HTML tags and NON-ASCII characters.Then "IncludeHelp!" will be printed on the webpage

Question 4:

<?php
    $val = 222;
    $min_range = 100;
    $max_range = 300;
    
    $isValid = filter_var($val, FILTER_VALIDATE_INT, array(
        "options" => array(
            "min_range" => $min_range,
            "max_range" => $max_range
        )
    ));
    
    if ($isValid == true) echo ("The val lies in given range");
    else echo ("The val does not lie in given range");
?>

Output:

The val lies in given range

Explanation:

In the above program, we created three variables $val, $min_range, and $max_range initialized with 222, 100, and 300 respectively.

$isValid = filter_var($val, FILTER_VALIDATE_INT, array(
    "options" => array(
        "min_range" => $min_range,
        "max_range" => $max_range
    )
));

The above function will return true because 222 lying between 100 and 300, then "The val lies in given range" will print on the webpage.

Question 5:

<?php
    $val = 222;
    $min_range = 100;
    $max_range = 300;
    
    $isValid = filter_var($val, FILTER_VALIDATE_INT, array(
        "options" => array(
            "xxx" => $min_range,
            "yyy" => $max_range
        )
    ));
    
    if ($isValid == true) echo ("The val lies in given range");
    else echo ("The val does not lie in given range");
?>

Output:

The val lies in given range

Explanation:

In the above program, we created three variables $val, $min_range, and $max_range initialized with 222, 100, and 300 respectively.

$isValid = filter_var($val, FILTER_VALIDATE_INT, array(
    "options" => array(
        "xxx" => $min_range,
        "yyy" => $max_range
    )
));

The above function will return true because 222 lying between 100 and 300, then "The val lies in given range" will print on the webpage.

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