循环

Question

preg_match在以下

上工作正常

function percentageExt($text){
    preg_match_all("/[0-9 ]+%/", $text, $matches);
    return $matches;
}
$string = "Tools Minimum 20 % off and in maximum 25% off";
$extracted = percentageExt($string);
print_r($extracted);

但是如果在while循环中实现相同的话，则不起作用

function percentageExt($text){
    preg_match_all("/[0-9 ]+%/", $text, $matches);
    return $matches;
}
$query = mysql_query("select title from deals");
while($query_rows = mysql_fetch_array($query)){
    $extracted = percentageExt($query_rows['title']);
    print_r($extracted);
}

请提出我承诺的常见错误。