Ti suggerisco di ricominciare dalle basi del PHP:

http://www.php.net/manual/en/languag....syntax.double
http://www.php.net/manual/en/language.types.array.php
http://www.php.net/manual/en/languag...e-juggling.php

Codice PHP:
<pre><?php
$array 
range(13);

print_r($array);
print_r("$array");
print_r((string)$array);
?></pre>