[TYPO3-english] can anyone help me to check this php code?

[typo3 study]

Hi,

function search()
{
if ($this->piVars['keyword'])
{
if(is_array($this->piVars['keyword']) )
{
$res = $GLOBALS['typo3_DB']->exec_SELECTquery(
'fe.uid, fe.email, fe.city',
'tx_jc_text jc LEFT JOIN fe_users fe ON fe.uid = jc.cruser_id',
'jc.contents LIKE \'%'.$this->piVars['keyword'].'%\' '
   );
}
}
}

I want to make it function like this: if some one input "john swens freddy"
in search box, it will show all the texts including john, or swens, or
freddy,
the search result will be like this:
1. john is a good person...
2. john freddy is going to school...
3.freddy is coming...

So how could I change the php code above? Thanks.