mysql - PHP Redirecting based on this error -


(please bear me.) want redirect page if error produced. if there duplicate entry in database (i.e. if goes wrong after submission db user resubmits page.)

error: insert di_ssenisub (timestamp, business_name, business_type, username, main_email, password) values (now(), '123', 'hotel', '123', 'jkljllk@mrmd.com', '$2y$10$gyxxbmhknmqrehhb2qow8uvvs7hnomdn4otpv8m98.ln/3r6mwseg') duplicate entry '123' key ‘primary’

my code set on else:

else {    echo "error: " . $insertsql . "<br>" . mysqli_error($link); }

what want redirect them log in/error page, can log in , finish registration admin panel.

any thoughts? thanks.

 $insertsql = sprintf("insert di_ssenisub (timestamp,          business_name,          business_type,          username,          main_email,          password)            values (now(), %s, %s, %s, %s, %s)",         getsqlvaluestring($business_name, "text"),          getsqlvaluestring($business_type, "text"),          getsqlvaluestring($_post['username_entry'], "text"),          getsqlvaluestring($main_email, "text"),          getsqlvaluestring($hashpass, "text"));          if (mysqli_query($link, $insertsql)) {             session_start();             $_session['username'] = $username_check;             $_session['business_name'] = $business_name;             $_session['business_type'] = $business_type;             header('location: ../../register/' .$business_type_link);          }          "update $table_name set          business_name='$business_name',         business_type='$business_type',         username=$username_entry,         main_email='$main_email',         password = '$hashpass'           id='$user_id' limit 1");            mysqli_close($link);

update

 $insertsql = sprintf("insert di_ssenisub (timestamp,          business_name,          business_type,          username,          main_email,          password)            values (now(), %s, %s, %s, %s, %s)",         getsqlvaluestring($business_name, "text"),          getsqlvaluestring($business_type, "text"),          getsqlvaluestring($_post['username_entry'], "text"),          getsqlvaluestring($main_email, "text"),          getsqlvaluestring($hashpass, "text"));  $affected += mysqli_rows_affected($link); $insert_error = mysqli_errorno($link);          "update $table_name set          business_name='$business_name',         business_type='$business_type',         username=$username_entry,         main_email='$main_email',         password = '$hashpass'         id='$user_id' limit 1");    $affected += mysqli_rows_affected($link); $insert_error = mysqli_errorno($link);              session_start();             $_session['username'] = $username_check;             $_session['business_name'] = $business_name;             $_session['business_type'] = $business_type;          }         mysqli_close($link);

after insert , update, check data if problem.

and users favor, not reject user name. allow duplicate user names.

if want use unique user names , force user come unique name, add analytics see how many abandon site rather continue sign up.

if unique user name must used here on stackoverflow, have user name log in , on screen name. stackoverflow uses email log in. 

if ($affected == 0){    // error detection / correction here   // create warnings    include('form.php');   exit  } else{   include('next_page.php'); }

end of update

you not want redirect

use include, , repopulate inputs.

to eliminate duplicate first insert , follow insert update.

insert di_ssenisub (timestamp, business_name, business_type, username, main_email, password)

no need check error faster update. quick when record exists.

update `di_ssenisub` set `business_name` = '123', `business_type`,... `username` = '123';

the term uses columns in primary index. rest go in set.

if want validate values if find problem not redirect (`header("location: ')

you want pass problems found on user.

let's find problem invalid email:

$warn_email = '*";

include('form.php'); exit;

in form.php 

$warn_email<inpupt name="email"

repopulate inputs

you have submitted data:

$timestamp = $_post['timestamp']; $business_name = $_post['business_name']; $business_type = $_post['business_type']; $username = $_post['username']; $main_email = $_post['main_email'];

with include these values automatically passed form.

 <input type="text" name="business_name" value="$business_name" />  <input type="text" name="business_type" value="$business_type" />  <input type="text" name="username" value="$username" />  <input type="text" name="main_email" value="$main_email" />

if going in fresh, variables empty, , value="" in html.

if want check insert , or update error this:

$affected = 0;  insert ...  $affected += mysqli_rows_affected($link);  update ...  $affected += mysqli_rows_affected($link);  if ($affected == 0){echo 'houston have problem';}

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