Please Help about update text

[Rıza]

this update is work but sometimes textarea include sql command sql command does not work.
error_log as follow
DBD::mysql::st execute failed: You have an error in your SQL syntax; check the manual that correspondsI..............


CODE:

$text5 = $q->param('textarea');


$sql = "UPDATE webs SET ackla='$text2', admin='$text3', admin2='$text4', sql_info='$text5' where ktgori='$text' ";

$sqlh = $dbh->prepare($sql);
$sqlh->execute();

Please help meeeeee :(