您需要类似的东西

$req = $_GET['term']; //first get the search keyword as get method

$arrResults = array('orange', 'apple', 'bannana');

$array = array_filter($arrResults, 'mycallback');
//filter the array containing search word using call back function

function mycallback($var)
{
    global $req;
    if(preg_match('/^'.$req.'/', $var))
    {       
        return $var;
    }
}

$array1 = array();

//filter null array
foreach($array as $arr => $val)
{
        if(!empty($val))
        {
                $array1[] = $val;
        }

}

//echo out the json encoded array
echo json_encode($array1);