从文本框到mysql搜索关键字

Question

I explode the input of user to array and then search them in the database but if user enter the space as a result it will show the whole rows of the table which has space how can I make it correct?

if(isset($_POST['submit'])){
$keywords = explode(" ", $_POST["search"]);
for ($i=0; $i<count($keywords); $i++) {

$query = "SELECT * FROM mp3s " .
"WHERE (artist LIKE '%".$keywords[$i]."%' 
OR   genre LIKE '%".$keywords[$i]."%'  
OR  album LIKE '%".$keywords[$i]."%'
OR  filename LIKE '%".$keywords[$i]."%'
) ";
$sql = mysql_query($query) or die(mysql_error());

}

Answer 1

Use trim() to delete spaces and use mysql_real_escape_string() to prevent sql injections.

 if(isset($_POST['submit'])){
    $keywords = explode(" ", trim($_POST["search"]));
    for ($i=0; $i<count($keywords); $i++) {

    if(!empty($keywords[$i])) {

      $query = "SELECT * FROM mp3s " .
      "WHERE (artist LIKE '%".trim(mysql_real_escape_string($keywords[$i]))."%' 
      OR   genre LIKE '%".trim(mysql_real_escape_string($keywords[$i]))."%'  
      OR  album LIKE '%".trim(mysql_real_escape_string($keywords[$i]))."%'
      OR  filename LIKE '%".trim(mysql_real_escape_string($keywords[$i]))."%'
      ) ";
      $sql = mysql_query($query) or die(mysql_error());

    }

    }

But it's better to use MySQLi than the mysql_real_escape_string() function.
See http://php.net/manual/en/function.mysql-real-escape-string.php

Or PDO with the prepared statements :
http://php.net/manual/en/pdo.prepared-statements.php