How to throw custom error in PHP mysql - 


$row=mysql_fetch_array($result, mysql_assoc) or die(mysql_error())

in code mysql_error displayed if mysql_fetch_array fails.is there way throw mysql_error reloading page.

p.s: know mysql has been depreciated. old project.so please dont suggest answer use mysqli , pdo.i aware of it.please tell me way throw reload page error.

you use try catch exception handling in php
http://www.php.net/manual/en/language.exceptions.php

try     {      // can go wrong     }     catch (exception $e)     {      throw new exception( 'something wrong', 0, $e);     }

or

 try      {        // can go wrong     }     catch (exception $e)     {         if ($e instanceof customexception)         {             //         }         else if ($e instanceof otherexception)         {            //         }         else         {            //         }     }

or

try  {  } catch (customexception $e) {  } catch (otherexception $e) {  } catch (exception $e) {  }

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