going to fix inst_check_php_version() and add new strings,
new strings in install.php

$string['php52versionerror'] = 'PHP version must be at least 5.2.0.';
$string['php52versionhelp'] = '<p>Moodle requires a PHP version of at least 5.2.0.</p>
<p>You are currently running version $a</p>
<p>You must upgrade PHP or move to a host with a newer version of PHP!';