<?phpforeach(filter_list() as $id => $filter){    echo $filter.' '.filter_id($filter)."\n";}?>

<?php    /*** an integer to check ***/    $int = 1234;    /*** validate the integer ***/    echo filter_var($int, FILTER_VALIDATE_INT);    //1234?>

<?php    /*** an integer to check ***/    $int = 'abc1234';    /*** validate the integer ***/    echo filter_var($int, FILTER_VALIDATE_INT);?>

<?php    /*** an integer to check ***/    $int = 42;    /*** lower limit of the int ***/    $min = 50;    /*** upper limit of the int ***/    $max = 100;    /*** validate the integer ***/    echo filter_var($int, FILTER_VALIDATE_INT, array("min_range" => $min, "max_range" => $max));    //42?>

<?php    /*** an integer to check ***/    $int = 42;    /*** lower limit of the int ***/    $min = 50;    /*** upper limit of the int ***/    $max = 100;    /*** validate the integer ***/    echo filter_var($int, FILTER_VALIDATE_INT, array("options" => array("min_range" => $min, "max_range" => $max)));?>

<?php    /*** an integer to check ***/    $int = 12;    /*** lower limit of the int ***/    $min = 10;    /*** validate the integer ***/    echo filter_var($int, FILTER_VALIDATE_INT,array('options' => array('min_range' => $min)));    //12?>

<?php    /*** an array of values to filter ***/    $arr = array(10,"109","", "-1234", "some text", "asdf234asdfgs", array());    /*** create an array of filtered values ***/    $filtered_array = filter_var_array($arr, FILTER_VALIDATE_INT);    /*** print out the results ***/    foreach($filtered_array as $key => $value)    {        echo $key.' -- '.$value.'<br />';    }?>

0 -- 101 -- 1092 -- 3 -- -12344 -- 5 -- 6 -- Array

<?php    /*** a hex value to check ***/    $hex = "0xff";    /*** filter with HEX flag ***/    echo filter_var($hex, FILTER_VALIDATE_INT, array("flags" => FILTER_FLAG_ALLOW_HEX));    //255?>

<?php    /*** test for a boolean value ***/    echo filter_var("true", FILTER_VALIDATE_BOOLEAN);    //1?>

<?php    /*** a simple array ***/    $array = array(1,2,3,4,5);    /*** test for a boolean value ***/    echo filter_var(in_array(3, $array), FILTER_VALIDATE_BOOLEAN) ? "TRUE" : "FALSE";    //true?>

<?php    /*** a multi dimensional array ***/    $array = array(0, 1, 2, 3, 4, array(0, 1, 2, 3, 4));    /*** create the list of values ***/    $values = filter_var($array, FILTER_VALIDATE_BOOLEAN, FILTER_REQUIRE_ARRAY);    /*** dump the values ***/    var_dump($values);?>

array(6) {    [0] => bool(false)    [1] => bool(true)    [2] => bool(false)    [3] => bool(false)    [4] => bool(false)    [5] => array(5) {        [0] => bool(false)        [1] => bool(true)        [2] => bool(false)        [3] => bool(false)        [4] => bool(false)    }}

<?php    /*** an FLOAT value to check ***/    $float = 22.42;    /*** validate with the FLOAT flag ***/    if(filter_var($float, FILTER_VALIDATE_FLOAT) === false)    {        echo "$float is not valid!";    }    else    {        echo "$float is a valid floating point number";    }?>

<?php    /*** an array of values ***/    $array = array(1.2,"1.7","", "-12345.678", "some text", "abcd4.2efgh", array());    /*** validate the array ***/    $validation_array = filter_var($array, FILTER_VALIDATE_FLOAT, FILTER_REQUIRE_ARRAY);    /*** dump the array of validated data ***/    var_dump($validation_array);?>

array(7) {    [0] => float(1.2)    [1] => float(1.7)    [2] => bool(false)    [3] => float(-23234.123)    [4] => bool(false)    [5] => bool(false)    [6] => array(0) { }}

<?php    /*** an array of floats with seperators ***/    $floats = array(        "1,234" => ",",        "1.234" => "..",        "1.2e3" => ","    );    /*** validate the floats against the user defined decimal seperators ***/    foreach ($floats as $float => $dec_sep)    {        $out = filter_var($float, FILTER_VALIDATE_FLOAT, array("options" => array("decimal" => $dec_sep)));        /*** dump the results ***/        var_dump($out);    }?>

float(1.234)Warning: filter_var() [function.filter-var]: decimal separator must be one char in /www/filter.php on line 13bool(false)bool(false)

<?php     /*** a rfc compliant web address ***/    $url = "http://www.phpro.org";    /*** try to validate the URL ***/    if(filter_var($url, FILTER_VALIDATE_URL) === FALSE)    {        /*** if there is no match ***/        echo "Sorry, $url is not valid!";    }    else    {        /*** if we match the pattern ***/        echo "The URL, $url is valid!<br />";    }?>

<?php    /*** a non rfc compliant URL ***/    $url = "index.php";    /*** try to validate the URL ***/    if(filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED) === FALSE)    {        /*** if there is no match ***/        echo "Sorry, $url is not valid!";    }    else    {        /*** if the URL is valid ***/        echo "The URL, $url is valid!";    }?>

<?php    $email = "[email&#160;protected] mple.com";    if(!filter_var($email, FILTER_VALIDATE_EMAIL))    {        echo "E-mail is not valid";    }    else    {        echo "E-mail is valid";    }?>

<?php    function convertSpace($string)    {        return str_replace(" ", "_", $string);    }    $string = "Peter is a great guy!";    echo filter_var($string, FILTER_CALLBACK,array("options" => "convertSpace"));?>

Peter_is_a_great_guy!