<?php
$sourcestring="your source string";
preg_match_all('/<input\s[^>]*name="PPFT"[^>]*value="([^"]*)/',$sourcestring,$matches);
echo "<pre>".print_r($matches,true);
?>
$matches[1] if your target array.
if you use preg_match:
<?php
$sourcestring="your source string";
preg_match('/<input\s[^>]*name="PPFT"[^>]*value="([^"]*)/',$sourcestring,$matches);
echo "<pre>".print_r($matches,true);
?>
$matches[1] is your target.