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filter-ex-1.php
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filter-ex-1.php
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<!DOCTYPE html>
<html lang="en">
<!--
File: filter-ex-1.php
Desc: PHP filter_var() example
Date: 2023-06-17
Auth: sumkittehz.codes
Some of this code is lifted directly from
https://www.w3schools.com/php/phptryit.asp?filename=tryphp_filter7
-->
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>filter-ex-1.php</title>
<link rel="stylesheet" type="text/css"
href="/Documentation/documentation.css"/>
</head>
<body>
<?= '<div id="app">' ?>
<h1>
validate URL using <code class="func">filter_var()</code>
</h1>
<?php $url = "https://sumkittehz.codez"; ?>
<p>
validating URL <code class="url"><?=$url?></code>
</p>
<p>
<?php
// Remove all illegal characters from a url
$url = filter_var($url, FILTER_SANITIZE_URL);
// Validate url
if (!filter_var($url, FILTER_VALIDATE_URL) === false) {
echo("<code>$url</code> is a valid URL");
echo(": <a href=\"$url\">$url</a>");
} else {
echo("<code>$url</code> is <b>not a valid URL</b>");
}
?>
</p>
<?php
$listing_url = "/file-listing.php";
$thisfile = $_SERVER['PHP_SELF'];
$hrefstr = "$listing_url?fn=.$thisfile";
/*
TODO: use filter_var() here to santize the incoming file name
*/
print "<p><i>click on this link –</i>
<a href=\"$hrefstr\"><code>$hrefstr</code></a>
<i>– to see the source code for this file, or</i>
<a href=\"$listing_url\"><code>$listing_url</code></a>
<i>for more about our file listing code.</i></p>
";
?>
<?= '</div><!-- #app -->' ?>
</body>
</html>