Changing MySQL connection in the event of failure - PHP - php

Question

I'm working on a project where I need to test a remote MySQL connection and if it fails, then I need the code to switch over to using a local MySQL connection. The problem I'm running into is the code always displays the error which really kills the end-user experience.
Things I've tried:
try and catch exception <- got it to display a custom message, but nothing else.
suppressing the error with an # <- this really really affected the loading of the page.
yelling at the computer <- didn't work, but I felt better.
Code:
//-----Remote MySQL Server-----------
$rem_host="99.99.999.999"; //Host Name
$rem_user="testUser"; //MySQL Username
$rem_pass="testPass"; //MySQL Password
$rem_db="testDb"; //Database Name
//----Local MySQL Server-----------
$local_host="127.0.0.1"; //Host Name
$local_user="testLocal"; //MySQL Username
$local_pass="passLocal"; //MySQL Password
$local_db="localDb"; //Database Name
$remoteConnection = mysqli_connect("$rem_host","$rem_user","$rem_pass","$rem_db");
if(!$remoteConnection){ $check_connection=0; }
else{ $check_connection=1; mysqli_close($remoteConnection); }
if($check_connection==1){
$db_host = $rem_host; //Host Name
$db_user = $rem_user; //MySQL Username
$db_pass = $rem_pass; //MySQL Password
$db_name = $rem_db; //Database Name
}
else{
$db_host = $local_host; //Host Name
$db_user = $local_user; //MySQL Username
$db_pass = $local_pass; //MySQL Password
$db_name = $local_db; //Database Name
}
?>

Answer 1

Change line number 2 as per your choice. First i get URL and then check it has "localhost" word then i follow localhost detail (I am using localhost/ in local machine ). If $actual_link cannot get localhost then follow online detail
<?php
$actual_link = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
if (strpos($actual_link,'localhost') !== false)
{
//local db detail
$servername='localhost';
$dbusername='root';
$dbpassword='';
$dbname='db_gbook';
echo "local";
}
else
{
//online db detail
$servername='localhost';
$dbusername='dbaname';
$dbpassword='dbpassword';
$dbname='yourdbname';
echo "web";
}
global $link;
$link=mysql_connect ("$servername","$dbusername","$dbpassword");
if(!$link)
{
die("Could not connect to MySQL");
}
mysql_select_db("$dbname",$link) or die ("could not open db".mysql_error());
echo "Succesive";
?>