Question

can’t search _ or _ 2 field in database,
below is my code and I used before in other project, but now if I set like this for search keyword in two field, it only can search the 2nd field, I can’t figure why? How to fix this make it work?

Thanks.

php
$keyword = mysql_real_escape_string($_POST['keyword']);
$sql = "select * from $table where subject or content like '%$keyword%';";
$query = mysql_query($sql);
while($list = mysql_fetch_array($query)){
    $id = $list[id];
    $subject = $list[subject];
    $content = $list[content];
}

mysql
id    mediumint(6)    AUTO_INCREMENT  INDEX
subject    text    utf8_unicode_ci
content    longtext    utf8_unicode_ci    PRIMARY UNIQUE INDEX

Answer 1

it should be

select * 
from   $table
where  subject like '%$keyword%' or 
       content like '%$keyword%'

As a sidenote, the query is vulnerable with SQL Injection if the value(s) came from the outside. Please take a look at the article below to learn how to prevent from it. By using PreparedStatements you can get rid of using single quotes around values.

• How to prevent SQL injection in PHP?