Yup,
php.net has some good tutorials.
I'm also a php Deity - well, I know a bit about php
I've done a few php driven sites and can help with basics.
Here follows a generic "Hello World" tutorial...
<html>
<head>
<title>Hello World</title>
</head>
<body>
<?php
echo "Hello World<br>";
$str1 = "Hello";
$str2 = "World";
echo $str1." ".$str2."<br>";
?>
</body>
</html>
That shows you doing a straight forward stringy output, and a php variable driven one
All php code is held within the <?php ?> tags, although the opening tag can be abbreviated to <? - although some people frown upon that as it may cause problems with server configurations. <?php is just a bit more explanatory.
Cheers,
Karl