รบกวนช่วยดูหน่อยคะ คำสัั่งถูกต้องไหม $sql ="SELECT * from trigram where (w_one like '$a%' AND w_two like '$b%' AND w_three like '$c%') ";

$str_triang= explode("|",$str_segmented);
$a = "";
$b = "";
$c = "";
foreach ($str_triang as $k => $v)
{
if (strlen(trim($v))>0) 
  {
  if (strlen($a)<=0) $a = $v;
	elseif (strlen($b)<=0) $b = $v;
	elseif (strlen($c)<=0) 
		{	
			$c = $v;
		echo $a.$b.$c."<br>";
			$a = $b;
			$b = $c;
			$c = "";
function search_worderror($a,$b,$c)
 {
$sql ="SELECT * from trigram where (w_one like '$a%' AND  w_two like '$b%' AND w_three like '$c%') ";
}

SELECT * from trigram where (w_one like 'ประชุม%' AND w_two like 'ทาง%' AND w_three like '%')