how to write in php

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PHP

This code has worked well
echo "You're directed to this page from $keys[2] search engine, within Keywords $keys[1] If you Like Pcboxsearch Found You search
";

I wanted to ask

Which as I write this php code on the same page

""

I have tried this code

document.write('<ifr' +="" 'ame'="" width="300" height="150" frameborder="0" '="" src="$url$keys[1]" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no">' + '');

but not working

keyword found = $url$keys[1]

src="$url$keys[1]" same src="http://www.pcboxsearch.com/search.php?q= (keyword found) "

src="$url$keys[1]" This code was the result of his writing should src="http://www.pcboxsearch.com/search.php?q=code project"

example output code

<?php
require_once('./pcboxsearch.class.php');
$keys =& new search_keywords();
$keys = $keys->get_keys();
$url ='http://www.pcboxsearch.com/search.php?q=';
if (count($keys))
{
    echo "You're directed to  this page from <b>$keys[2]</b> search engine, within Keywords <b> <a href='$url$keys[1]'> $keys[1]</a> </b> If   you Like Pcboxsearch Found You search<br>";
}

?>

//output write php

<iframe src="http://www.pcboxsearch.com/search.php?q=code project" border="0" framspacing="0" marginheight="0" marginwidth="0" vspace="0" hspace="0" frameborder="0" height="100%" scrolling="yes" width="100%"></iframe>

can you solution