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I have an sql to add over 100 field to mysql database. I want to include coding for PDO to avoid this sql injection thing but, i'm new to all of this and really I do not know how nor truly understand it. Any help would be greatly appreciated. My form has over 100 fields. I have no knowledge of how to do this. Thank you in advance. Here's the code.

    <html>

<body>
<?php
>if (isset($_POST['submit'])){

    //Variables for connecting to your database.
    //These variable values come from your hosting account.
    $hostname = "hostname";
    $username = "username";
    $password = "password";
    $dbname = "dbname";
    $mystuff = array(  "tenant_lname","tenant_fname","tenant_mname","ssn","dl_number","dl_state","birthday","tenant_hphone","tenant_wphone","tenant_cphone","curr_street","curr__unit","curr_city","curr_state","curr_zip","how_long_from","how_long_to","last_rent_mnt","last_rent_amt","own_man_name","own_man_tel","curr_reason","pre_street","pre_unit","pre_city","pre_state","pre_zip","pre_from","pre_to","pre_last_rent","pre_amt","pre_owner","pre_owner_tel","pre_reason","sec_pre_street","sec_pre_unit","sec_pre_city","sec_pre_state","sec_pre_zip","sec_pre_from","sec_pre_to","sec_pre_last_paid_mnt","sec_pre_amt","sec_pre_owner","sec_pre_owner_tel","sec_pre_reason","curr_emp_name","curr_emp_add","curr_emp_phone","curr_emp_pos","curr_emp_bus_type","curr_emp_sup","curr_emp_from","curr_emp_to","curr_emp_salary","pre_emp_name","pre_emp_add","pre_emp_phone","pre_emp_pos","pre_emp_bus_type","pre_emp_sup_name","pre_emp_from","pre_emp_to","pre_emp_salary","move_date","addntl_occ_name","addntl_occ_age","addntl_occ_relation","addntl_ft","addntl_pt","addntl_occ1_name","addntl_occ1_age","addntl_occ1_relation","addntl_occ1_ft","addntl_occ1_pt","addntl_occ2_name","addntl_occ2_age","addnt2_occ1_relation","addntl_occ2_ft","addntl_occ2_pt","addntl_occ3_name","addntl_occ3_age","addntl_occ3_relation","addntl_occ3_ft","addntl_occ3_pt","credit_yes","credit_no","det_yes","det_no","evict_yes","evict_no","bnkry_yes","bnkry_no","fel_yes","fel_no","pet_yes","pet_no","pet_numb","pet_type","furn_yes","furn_no","ins_cov_yes","ins_cov_no","ints_yes","ints_no","ints_type","smoke_yes","smoke_no","occ_smoke_yes","occ_smoke_no","explain_smoke","bnk_name","bnk_add","checking","checking_bal","saving","saving_bal","bnk_name1","bnk_add1","checking1","checking_bal1","saving1","saving_bal1","other_income","credit_name","credit_add","credit_city","credit_acct","credit_bal","credit_payment","credit_name1","credit_add1","credit_city1","credit_acct1","credit_bal1","credit_payment1","credit_acct2_name","credit_add2","credit_city2","credit_acc2","credit_bal2","credit_payment2","credit_acc3_name","credit_acc3_add","credit_acc3_city","credit_acc3_number","credit_acc3_bal","credit_acc3_payment","emer_contact_name","emer_contact_add","emer_relation","emer_phone","reg_owner_yes","reg_owner_no","reg_who","vehicle_year","vehicle_make","vehicle_model","vehicle_color","vehicle_license","veh_state","vehicle2_year","vehicle2_make","vehicle2_model","vehicle2_color","vehicle2_license","veh2_state");


    $sql_values=array();
    foreach($mystuff as $fieldname) {
        /* do validation! */

        $sql_values[$fieldname] = "'" . mysql_real_excape_stiring($_POST[$fieldname]) . "'";
    }


    $con = mysql_connect("$hostname","$username","$password");
    if (!$con){
        die ("Can not connect:" . mysql_error());
    }

    mysql_select_db("dbname",$con);

    $sql = "INSERT INTO dbname (".implode(',', $mystuff).") VALUES (" . implode(',', $sql_values) . ")";

    mysql_query($sql,$con);

    mysql_close($con);
}


foreach($mystuff as $fieldname) {
    echo "...an input field...";
}

?>



</body>
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