AdSense in PHP

<script type="text/javascript"><!--
google_ad_client = "ca-pub-8529256760980681";
/* Mafiaforce banners */
google_ad_slot = "1431662848";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>

<?php


<script type="text/javascript"><!-- 
google_ad_client = "ca-pub-8529256760980681"; 
/* Mafiaforce banners */ 
google_ad_slot = "1431662848"; 
google_ad_width = 468; 
google_ad_height = 60; 
//--> 
</script> 
<script type="text/javascript" 
src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> 
</script>


?>

<?php
echo "<script type="text/javascript"><!-- 
";
echo "google_ad_client = "ca-pub-8529256760980681"; 
";
echo "/* Mafiaforce banners */ 
";
echo "google_ad_slot = "1431662848"; 
";
echo "google_ad_width = 468; 
";
echo "google_ad_height = 60; 
";
echo "//--> 
";
echo "</script> 
";
echo "<script type="text/javascript" 
";
echo "src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> 
";
echo "</script>
";
?>

<?php
//assign adsense code to a variable
$googleadsensecode = '
<script type="text/javascript">
google_ad_client = "ca-pub-8529256760980681";
google_ad_slot = "1431662848";
google_ad_width = 468;
google_ad_height = 60;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>';
//now outputting this to HTML
echo $googleadsensecode;
?>