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PHP Filters Advanced


Check if a number is within a range

The following example uses the filter_var () function to check whether an INT variable is between 1 and 200:

Example

<?php
$int = 122;
$min = 1;
$max = 200;

if (filter_var($int, FILTER_VALIDATE_INT, array("options" => array("min_range"=>$min, "max_range"=>$max))) === false) {
    echo("Variable value is out of legal range");
} else {
    echo("Variable value is within legal range");
}
?>


Detect IPv6 address

The following example uses the filter_var () function to detect whether a $ ip variable is IPv6 address:

Example

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

if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false) {
    echo("$ip Is an IPv6 address");
} else {
    echo("$ip not one IPv6 address");
}
?>


Detection URL-must contain QUERY_STRING (query string)

The following example uses the filter_var () function to detect whether $ url contains a query string:

Examples

<?php
$url = "https://www.welookups.com";

if (!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED) === false) {
    echo("$url Is anlegalURL");
} else {
    echo("$url not one legal URL");
}
?>


Remove characters with ASCII values greater than 127

The following example uses the filter_var () function to remove characters with ASCII values greater than 127 in a string. It can also remove HTML tags:

Example

<?php
$str = "<h1>Hello World!</h1>";

$newstr = filter_var($str, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);
echo $newstr;
?>