Some basic PHP

HTML CODE<br />
Concatenate in PHP is with a .<br />
in JavaScript and Java, it's just a +<br />
<br />
<br />
<?php
echo 'This is from $_GET["name"]: ' . $_GET["name"] . "<br />";
echo 'This is from $_POST["secretdata"]: ' . $_POST["secretdata"] . "<br />";

echo 'This is from $_REQUEST["listenboth"]: ' . $_REQUEST["listenboth"] . "<br />";

echo "You can also include HTML in your PHP. Set html=true in the query string<br /><br />";

if ($_GET['html']=="true") {
  ?>

  This is pure HTML, even inside an IF statement!
  <br />
  <br />

  <?php
}

$somevar =  filter_input(INPUT_GET, 'somevar', FILTER_SANITIZE_ENCODED); //INPUT_POST can also be used, INPUT_REQUEST can't. Always use POST when submitting forms.

echo 'Here is $somevar: ' . $somevar;