PHP Filters

Validate an Integer Within a Range

<!DOCTYPE html>
<html>
<body>
<?php
/* variable to check */
$int = 12;
/* min value */
$min = 1;
/* max value */
$max = 20;

if (filter_var($int, FILTER_VALIDATE_INT, array("options" => array("min_range"=>$min, "max_range"=>$max))) === false) {
echo("Variable value is not within the range");
} else {
echo("Variable value is within the range");
}
?>
</body>
</html>

Validate IPv6 Address

IPv6 addresses are normally written as eight groups of four hexadecimal digits, where each group is separated by a colon (:).

<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check

$ip = "2001:0db8:85a3:08d3:1319:8a2e:0370:7334";

// Validate ip as IPv6
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false) {
echo("$ip is a valid IPv6 address");
} else {
echo("$ip is not a valid IPv6 address");
}
?>
</body>
</html>

Validate URL – Must Contain QueryString

<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check
$url = "http://scriptsgurus.com/";
// Validate url
if (!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED) === false) {
echo("$url is a valid URL");
} else {
echo("$url is not a valid URL");
}
?>
</body>
</html>

Remove Characters With ASCII Value > 127

<!DOCTYPE html>
<html>
<body>
<?php
// Variable to check
$str = "<h1>Hello WorldÆØÅ!</h1>";
// Remove HTML tags and all characters with ASCII value > 127
$newstr = filter_var($str, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);
echo $newstr;
?>
</body>
</html>