PHP mysql过滤后查询

尝试在查询后过滤结果。需要在一个tinytext字符串中找到一个字符串。看起来像:accounting, ACT, algebra 1, algebra 2, American history, biology, calculus, economics, English, European history, geometry, grammar, literature, piano, proofreading, psychology, reading, SAT math, SAT reading, SAT writing, statistics, violin, vocabulary,

代码 -要查找的主题字符串是$subject，要搜索的列表是$row['SubjectList']

$result = mysql_query($query, $dbConn);
$i=0;
while ($row = @mysql_fetch_assoc($result)){
    $results[$i]['Name'] = $row['Name'];
    $results[$i]['Zip'] = $row['ZipCode'];
    $results[$i]['SubjectList'] = $row['SubjectList'];
    $i++;
}