<?php
/*
1. Validation: Check input data in proper form.
2. Sanitization: Remove illegal character from input data.
A. filter_var(variable, filter, options) -> This functions validate and sanitize the input.
*/
// input data
$input_roll = 120;
// Remove all illegal characters from input data
$input_roll = filter_var($input_roll, FILTER_SANITIZE_URL);
// Validate sample integer value
if(filter_var($input_roll, FILTER_VALIDATE_INT)){
echo "<br /> The <b>$input_roll</b> is a valid integer";
} else {
echo "<br /> The <b>$input_roll</b> is not a valid integer";
}
// Validate sample integer value with options
$min = 1;
$max = 200;
if (filter_var($input_roll, FILTER_VALIDATE_INT, array("options" => array("min_range"=>$min, "max_range"=>$max))) === false) {
echo ("<br /> The <b>$input_roll</b> is a not valid integer || not within the legal range");
} else {
echo ("<br /> The <b>$input_roll</b> is a valid integer & within the legal range");
}
// Validate url with query parameter
$url = "https://www.w3schools.com?id=5"; // validated
//$url = "https://www.w3schools.com"; // not valdated
if (!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED) === false) {
echo("<br />$url is a valid URL with a query string");
} else {
echo("<br />$url is not a valid URL with a query string");
}
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