Tuesday, December 11, 2018

Laravel Check if SMTP Connection is valid


While working with Laravel we often add SMTP credentials to send mail. It's important to check SMTP connection before sending mail or else it may give you error and throw run time exception. Here in this blog I am going to explain how to check SMTP connection before sending mail.

Below is the code you can use to check.

try {
$security = ($request->get('mail_encryption') != 'None') ? request()->get('mail_encryption') : null;
$transport = new \Swift_SmtpTransport($request->get('mail_host'), $request->get('mail_port'), $security);
$mailer = new \Swift_Mailer($transport);
catch (\Swift_TransportException $e) {
return redirect('mailSettings')->withInput()->with(array('message'=>'Can not connect to SMTP with given credentials.'));

As you can see in above code, first we are setting security config and create Swift_SmtpTransport class. After this we add add username and password. After that we create Swift_Mailer class and check it, if it throws an exception that means credentials are wrong or else credentials are correct.

Laravel Create Custom Validator

As we all know that Laravel comes with in built set of custom validators like required, unique etc using which we can do form or request validations on server side. In this blog I am going to explain how to create custom validator.

Custom validator is required when you have some special logic validations. For example a field should be minimum of 12 characters, it should start with special prefix etc.

To do this Laravel provides way to create custom field validator. You have to extend Validator in boot method of AppServiceProvider. Here is the complete code.

use Validator;

public function boot()
        Validator::extend('VALIDATOR_NAME', function($attribute, $value, $parameters, $validator) {
               //validation logic
               //should return true or false

       Validator::replacer('greater_than_field', function($message, $attribute, $rule, $parameters) {
  return $attribute."MESSAGE".$parameters[0];

As you can see in above code, first we define validator with Validator::extend and then using Validator::replacer we can define the message to be displayed.

This way you can create your own validators and then use it with Validator class.

$this->validate($request, [

Thursday, November 1, 2018

Laravel : Better Way To Deal with Trying to Get Property Of Non Object

Hello Everyone,

After a gap of almost 3 months I am again writing a blog. In laravel project we sometimes face issues like we try to access model but it's not available due to various reason like
  • id we passed is wrong
  • we manually deleted records from database
  • wrong value saved in database.
  • wrong model you are trying to access with wrong value.
When we get this error, Laravel throws an ErrorException with message "Trying to get property of non object."

However, end user does not understand this error so we have to show them proper message on what's missing. We can not display generic error page and for each line of code we can not put the check so better to check it at single place. Laravel gives this functionality in Exception Handler. Here the trick is to get model which throws this error and get name of Model and display proper message. 

Laravel has class ModelNotFoundException which is thrown when you use findOrFail function. However we developers sometime do not use this function and use find function. 

When find function is used, it throws ErrorException which does not contain Model information. However we can modify Laravel source code for this. 

Open following file 


Here find public function find($id, $columns = ['*'])

and modify it as following.

        if (is_array($id) || $id instanceof Arrayable) {
            return $this->findMany($id, $columns);
        $object = $this->whereKey($id)->first($columns);
        if($object == null){
            throw (new ModelNotFoundException)->setModel(
                get_class($this->model), $id
            return $this->whereKey($id)->first($columns);


Now if you use find or findOrFail function it will throw ModelNotFoundException. Now open app/Exception/Handler.php file and find out function public function render($request, Exception $exception)

Add following code at start of the function.

       if(get_class($exception) == 'Illuminate\Database\Eloquent\ModelNotFoundException'){
            $modelName = explode("\\",$exception->getModel());
            $modelName = $modelName[count($modelName)-1];
            $message = "You are trying to access ".$modelName." which does not exist.";
                return Response::make(view('Frontend.error')->with(array(

That's it and now it will display proper message like

You are trying to access User which does not exist.
You are trying to access Post which does not exist.

Hope this helps you.

Wednesday, August 1, 2018

Laravel Allow Single Login Only


Recently in one of my project we need functionality to allow only single session for user. So if I am logged in with one user account then I can not use it on other device. If they try to do so, it will log you out from first last session and will continue with current session.

So here is the trick I have used is to store active session id to users table and then check it with new session id on login. If both are not same then destroy the old session.

So first of all create migration and add session id column in users table.

Schema::table('users', function($table)

Now in your AuthController or LoginController add following function after user is authenticated.

$user = \Auth::user();
$currentSessionId = $request->session()->getId();
if($lastSessionId != null){
if($currentSessionId != $lastSessionId){
//destroy last session
$user->session_id = $currentSessionId;

So here it will destroy old session and create new one. Please note this is one way to achieve single login. There could be better trick, in that case please share here.lara

Saturday, July 21, 2018

Step By Step : Laravel - Publish Post on Facebook Page with Graph API


In this quick blog we will quickly go through how to publish a post on Facebook Page with graph API from your Laravel Application.

Step 1 : Create Facebook App

Login to https://developers.facebook.com/ with your Facebook account and create an app.

Now go to Settings -> Basic of your Facebook app and copy app id and app secret.

Step 2 : Install Facebook PHP SDK

Run following command to install PHP SDK in your laravel application.

composer require facebook/graph-sdk

Step 3: Get Exchange Token from Facebook App

Go to Facebook Graph API Explorer. Here is the link  https://developers.facebook.com/tools/explorer/

From here first select your application and then select the page for Page Access Token

When you are generating this token please select graph API version 2.2 and select the following permissions.


Step 4 : Generate Access Token 

From the exchange token generated in Step 3, Get the access token.

$url = 'https://graph.facebook.com/oauth/access_token?grant_type=fb_exchange_token&client_id= YOUR_APP_ID&client_secret= YOUR_APP_SECRET&fb_exchange_token=YOUR_TOKEN';

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
$output = json_decode($result);
$access_token = $output->access_token;

Step 5 : Call Facebook Graph API to Send Post to Page

Create SDK object

$fb = new \Facebook\Facebook([
'app_id' => 'YOUR_APP_ID',
'app_secret' => 'YOUR_APP_SECRET',
'default_graph_version' => 'v2.2',

Generate Payload

$linkData = [
 'link' => YOUR_LINK,
 'message' => YOUR_TITLE

Call Graph API.

$pageAccessToken =$access_token;

try {
 $response = $fb->post('/me/feed', $linkData, $pageAccessToken);
} catch(Facebook\Exceptions\FacebookResponseException $e) {
 echo 'Graph returned an error: '.$e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
 echo 'Facebook SDK returned an error: '.$e->getMessage();
$graphNode = $response->getGraphNode();

Now check your Facebook page there will be post on your Facebook page. Hope this helps you.

Friday, April 20, 2018

Laravel ValidationException Handling

This is the creepiest thing I have ever fixed in Laravel. I can't even imagine that in Laravel we can have such creepy problem. But anyways other than this I really like Laravel framework.

First let me explain the problem. In our Laravel 5.5 application we have added exception handling in app/Exceptions/Handler.php file

public function render($request, Exception $exception)

Now the problem was in case of form validations it was throwing ValidationException so in case of returning back to form it always took me to the error page and I am not able to see what are the validation issues. Now that was really strange. So there were two options . First, I have to remove server side validations so it does not throw ValidationException and we shall do all client side validations. Or find out some other way to handle this.

So after 3 to 4 hours of struggle of going though framework code and documentation and online help I finally figure out the solution. Here are steps to add it.

1) Step 1 : Add  ValidationException in dontReport field in app/Exceptions/Handler.php

protected $dontReport = [

2) Step 2 : Update the render method declaration

public function render($request, Exception $exception)
       return $this->convertValidationExceptionToResponse($exception, $request);

So here first we are checking if the current exception to be reported or not by checking shouldReport function

If not to be reported then we are using convertValidationExceptionToResponse method of super class to generate the response and send it back.

Please note that this solution will only work

Sunday, February 25, 2018

Scroll Two Divs Together

Recently in one of my project there was a requirement to maintain scroll positions of two divs. In UI there are two divs side by side. If user scrolls on left DIV then right div should also be scrolled and if user scrolls on right DIV then left div should also be scrolled. So here is how to do this.

var leftPart = document.getElementById('leftPart');
var rightPart = document.getElementById('rightPart');

Now lets add scroll event on both.

leftPart.onscroll = function() {
    rightPart.scrollTop = this.scrollTop;

rightPart.onscroll = function() {
    leftPart.scrollTop = this.scrollTop;

That's it now both should scroll no but wait it makes your UI unresponsive because there is a deadlock. While right one is scrolling, it will also scroll left one and at the same time it will also fire event and will try  to scroll right one again and there is DEADLOCK.........

So to prevent it, we have to add flags to check if one is already scrolling then hold the event.

so lets have two flags.

var isSyncingLeftScroll = false;
var isSyncingRightScroll = false;

and use it in scroll event.

leftPart.onscroll = function() {
  if (!isSyncingLeftScroll) {
    isSyncingRightScroll = true;
    rightPart.scrollTop = this.scrollTop;
  isSyncingLeftScroll = false;

rightPart.onscroll = function() {
  if (!isSyncingRightScroll) {
    isSyncingLeftScroll = true;
    leftPart.scrollTop = this.scrollTop;
  isSyncingRightScroll = false;

That's it and now you will have smooth scrolling effect on both the DIVs. Hope this helps you.

Sunday, February 11, 2018

OSX MAMP, Update PHP Version


So recently I was working on Laravel Lumen framework where we need PHP 7.1.3 version. In my OSX XAMPP was using php version 7.1.1

So here in this blog I am going to explain step by step procedure.

Step 1: Go to MAMP website and download the new version of PHP. Go to following link

MAMP Downloads

On left side you will see column with title "Additional PHP versions"

There you will find list of PHP versions for OSX, download the one which you want and extract it. Copy it to

MAMP\bin\php folder.

For example if you download php version 7.1.3 then you will get folder with name


Now you have to make two changes.

First edit path in your bash profile and update the existing path of PHP to newer version.

export PATH=/Applications/MAMP/bin/php/php7.1.3/bin:$PATH

After this quit the MAMP and restart it. It should work. No wait still it may not work for you.  As you go to MAMP preference screen, you will see that still it's using old version and new version is not displayed there.

That's because, by default free version of MAMP displays only last two folder here. So trick is to delete old folder or rename it and now your version of PHP will be displayed. Select it click on OK, restart MAMP and that's it now you get newer version of PHP. 

Hope this helps you.

Sunday, February 4, 2018

Some Tips and Tricks of Working With Bootstrap Select2 Control


Since I am a web developer, I used to work  a lot with Bootstrap Select 2 Control. Here I am going to share some quick tips and tricks of working with Select 2 controls.

1) Dynamically create Select2 control with JavaScript

When we are working on dynamic websites, sometimes we also have to create select2 controls dynamically. Most of the developers faces issues here. Because select2 control is created by JavaScript on document ready. So if you want create it dynamically, first append basic html of control inside and the by using JavaScript init it.

Something like this.


Sometimes it takes time to get reflect in DOM so in this case you may have to give some timeout.


2) Open Select2 dropdown on focus.

This is one more UX experience. Most of the web users are used to work with TAB. So in your form if you have select2 control and you come on it via tab. It should open dropdown.

Here is how we can do it.

$(document).on('focus', '.select2', function() {
if($(this).prev().val() == ''){

3) Open Select2 dropdown with down arrow key

This is one more UX experience. Most of the web users are used to work with up and down arrow while working with dropdown. So in case of select2 they are expecting the same result.

$(document).on('keydown', '.select2', function(event) {
    if(event.keyCode == 40){

4) Keep focus on Select2 after selecting item and dropdown is closed.

In new version of Select2 there is a bug that after you select an item and dropdown is closed. It will lost focus. So to keep focus on the control, use following code.

  function () {

Hope this tips helps you in your development with Select2.

Friday, February 2, 2018

Amazon EC2 Laravel Not Live After " php artisan up " Command


This blog post is about quick tip for the users who have deployed Laravel application on Amazon EC2 instance.

Recently we had Laravel application deployed on Amazon EC2 instance where we put site on maintenance mode with command

php artisan down

Worked properly, site was in maintenance mode and displayed

Be Right Back screen.

After sometime we tried to make site up and running by

php artisan up

Didn't work as site was still displaying

Be Right Back screen

Tried to clear the cache and config with

php artisan cache:clear
php artisan config:clear

But still it didn't worked. After 5 to 10 mins to struggle, found out an issue. It was because of file permission issue.  When you put site to maintenance mode, it creates

storage/framework/down folder

When you run

php artisan up

This folder should be removed. However in my case I was not using root user hence this file was not deleted.

So solution is

go to storage/framework folder and run command

rm -rf down

and that's it, your site is up and live.

Hope this helps you. 

Monday, January 15, 2018



Recently I configured SSL on Amazon EC2 instance running Apache server. In this blog I am going to explain the procedure step by step.

Step 1 : Generate CSR and submit to CA authority for verification

To generate CSR login to your server with SSH and use following command.

openssl req -new -newkey rsa:2048 -nodes -keyout YourDomain.key -out YourDomain.csr

Once you execute this command it will ask for certain inputs and based on it it will generate csr file. That you have to submit to CA authority and generate

Step 2 : Edit Inbound rules on your EC2 Instance and allow HTTPS

Login to Amazon AWS console and go to EC2 dashboard. Click on instance and edit security rules. Select HTTPs and allow it from anywhere.

Step 3 : Upload your SSL certificate and key file to EC2 using SSH

 You can use SCP command to upload crt file and pem key file to server.

scp -i "YourKey.pem" "Cert.crt" ubuntu@YourIP:/home/ubuntu/Cert.crt
scp -i "YourKey.pem" "Key.key" ubuntu@YourIP:/home/ubuntu/Key.key

Step 4 : Edit Default SSL config file and Add Certificate In File

Go to  cd /etc/apache2/sites-available

Update default-ssl.conf file by using command

sudo nano default-ssl.conf

Add following lines in file

SSLEngine on
SSLCertificateFile      /home/ubuntu/Cert.crt
SSLCertificateKeyFile /home/ubuntu/Key.key

Save the file.

Step 5 : Enable SSL mode in Apache and set config file to default-ssl.conf

Now we have ssl config file set, we have to enable SSL mode in apache and set config file.

Use following command

sudo a2enmod ssl
sudo a2ensite default-ssl.conf
sudo service apache2 reload
sudo service apache2 restart

That's it and now you can access your web app on HTTPS. Hope this helps you.

Sunday, January 14, 2018

jQuery Close Modal Window When User Clicks Outside of It

Recently in my work we faced an issue due to some JavaScript conflict on a page where we have modal popups that were not closing when user clicks outside of it and anywhere on page. Normally it does automatically in jQuery pop up. So here we have to add custom code to handle this situation. In this blog I am going to explain how to do it.

In above picture I explained how to do it. So basic trick is to track click event on entire web page and to check it it's X and Y coordinates are inside the BOX of modal window. If yes then do not close it. But if it's out side of it, close the modal popup. Here is the code for the same.

  var rect = $('.modalSelector')[0].getBoundingClientRect();
  clientX1 = rect.x
  clientX2 = rect.x + rect.width;

  clientY1 = rect.y
  clientY2 = rect.y + rect.height;

  if((e.clientX >= clientX1 && e.clientX <= clientX2) && (e.clientY >= clientY1 && e.clientY <= clientY2)){

    $('. modalSelector').hide();

That's it and it will close if you click anywhere on web page outside of modal popup.