在一定长度的PHP JQuery Search之后忽略输入的文本

我正在使用教程来创建搜索引擎。 但是，我希望允许用户继续键入搜索，但在输入一定量的文本后使搜索忽略任何内容。

我明白了

include_once ('database_connection.php');//Including our DB Connection file if(isset($_GET['keyword'])){//IF the url contains the parameter "keyword" $keyword = trim($_GET['keyword']) ;//Remove any extra space $keyword = mysqli_real_escape_string($dbc, $keyword);//Some validation $query = "select topictitle,topicdescription from topics where topictitle like '%$keyword%' or topicdescription like '%$keyword%'"; //The SQL Query that will search for the word typed by the user . $result = mysqli_query($dbc,$query);//Run the Query if($result){//If query successfull if(mysqli_affected_rows($dbc)!=0){//and if atleast one record is found while($row = mysqli_fetch_array($result,MYSQLI_ASSOC)){ //Display the record echo '
 '.$row['topictitle'].' '.$row['topicdescription'].'
' ; } }else { echo 'No Results for :"'.$_GET['keyword'].'"';//No Match found in the Database } } }else { echo 'Parameter Missing in the URL';//If URL is invalid } 

但我不知道如何在用户键入7个字符后让用户继续输入但在第7个字符后忽略任何内容。 有帮助吗？

Answer 1

试试这个

 $keyword = trim($_GET['keyword']) ;//Remove any extra space $keyword = mysqli_real_escape_string($dbc, $keyword);//Some validation if(strlen($keyword) > 7){ $keyword = substr($keyword,0,7);//This will give you first 7 characters if the user input is greater than seven characters in length. } 

Answer 2

 7) { $keyword= substr($_GET['keyword'],0,7); } $keyword = trim($keyword) ;//Remove any extra space $keyword = mysqli_real_escape_string($dbc, $keyword);//Some validation $query = "select topictitle,topicdescription from topics where topictitle like '%$keyword%' or topicdescription like '%$keyword%'"; //The SQL Query that will search for the word typed by the user . $result = mysqli_query($dbc,$query);//Run the Query if($result){//If query successfull if(mysqli_affected_rows($dbc)!=0){//and if atleast one record is found while($row = mysqli_fetch_array($result,MYSQLI_ASSOC)){ //Display the record echo '
 '.$row['topictitle'].' '.$row['topicdescription'].'
' ; } } else { echo 'No Results for :"'.$_GET['keyword'].'"';//No Match found in the Database } } } else { echo 'Parameter Missing in the URL';//If URL is invalid } ?>