php - Is it safe to let the user specify the mysql field to search? -

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i have search program has multiple input text boxes correspond fields in mysql database. know if safe have custom search box user can enter actual field searched , value.

like this:

<form method='post'>  <input type='text' name='param1' />  <input type='text' name='param2' />  <input type='text' name='customfield' />  <input type='text' name='customvalue' /> </form>

then when submitted:

$param1 = mysql_real_escape_string($_post['param1']); $param2 = mysql_real_escape_string($_post['param2']); $customfield = mysql_real_escape_string($_post['customfield']); $customvalue = mysql_real_escape_string($_post['customvalue']);  $query = "select * mytable field1 '" . $param1 . "' , field2 '" . $param2 . "' , " . $customfield . " '" . $customvalue . "'";

this internal webpage , few of see these new boxes know if sql injection possible here.

you should check fields provided in list/array of fields allow searching within. add backticks around field names in query safe well. doing both things prevent injection through variables.


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