รบกวนช่วยดูฟังก์ชันนี้หน่อยคะ พอดีต้องการรีเทิร์นค่า แต่ลองทำแล้วออกมาไม่หมด ได้แค่เดียวเท่านั้น

foreach($sr_trigram as $key=>$Str_trigram)
{
	return$sr_trigram.$frequency_tri ;
	//return$sr_trigram;	
}

function nGRam($str_new)//ยังไม่ได้
{
	
	$a = "";
	$b = "";
	$c = "";
	
	foreach ($str_new as $k => $v)
	{
		if (strlen($v)>0) 
		{
			if (strlen($a)<=0) $a = $v;
			elseif (strlen($b)<=0) $b = $v;
			elseif (strlen($c)<=0) 
			{	
				$c = $v;
				$triGram=$a.$b.$c;
				
				$sql="select * from trigram where w_one ='$a' AND w_two='$b' AND w_three='$c'";
				$result = mysql_query($sql ) or die(mysql_error());
			//	echo $sql."<br>";				
					
				$row = mysql_num_rows($result);
				if ($row>0)
				{
					for ($i=0; $i<$row; $i++)
					{
						$table  = mysql_fetch_array($result);
						$w_one = $table["w_one"];
						$w_two =$table["w_two"];	                                              
						$w_three = $table["w_three"];
						$frequency_tri =$table["frequency"];
					
						$sr_trigram[] = $w_one.$w_two.$w_three;
						$StrtriGram[]=$sr_trigram.':'.$frequency_tri;
						foreach($StrtriGram as $key=>$Str_trigram)
						{
							$WordtriGram=$Str_trigram;
						}
						return$WordtriGram;
						
					}
						
				}
				
				$a = $b;
				$b = $c;
				$c = "";		
				
				}
			}					
		}					
	//}
}