php - Mysql real escape -

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so using mysql_real_escape_string function stop sql injection attacks in following code doesn't seem working, how go fixing this? 

<?php $address = mysql_real_escape_string($_post['bitcoinaddress']);  $btc = mysql_real_escape_string($_post['btcamount']);  $phone = mysql_real_escape_string($_post['phonenumber']);  $con = mysql_connect("localhost","db user","password"); if (!$con)   {   die('could not connect: ' . mysql_error());   }  mysql_select_db("db_name", $con); $sql="insert `db_name`.`form` (`bitcoinaddress`, `btcamount`, `phonenumber`) values ('$_post[bitcoinaddress]','$_post[btcamount]','$_post[phonenumber]')";  if (!mysql_query($sql,$con))   {   die('error: ' . mysql_error());   }   echo ($_post['btcamount']);   mysql_close($con); ?>

the problem aren't using it...

make change.

<?php  $address = mysql_real_escape_string($_post['bitcoinaddress']);    $btc = mysql_real_escape_string($_post['btcamount']);    $phone = mysql_real_escape_string($_post['phonenumber']);    $con = mysql_connect("localhost","db user","password");  if (!$con)    {    die('could not connect: ' . mysql_error());    }    mysql_select_db("db_name", $con);  $sql="insert `db_name`.`form` (`bitcoinaddress`, `btcamount`, `phonenumber`) values  ('".$address."','".$btc."','".$phone."')";    if (!mysql_query($sql,$con))    {    die('error: ' . mysql_error());    }    echo ($btc);    mysql_close($con);  ?>


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