How To Make A Sentiment Analyzer In PHP, In Under 10 Minutes?
Tags: php, laravel, ai, webdev
Published: 2022-02-25 09:14:09

I came across this concept of this sentiment analysis only recently. It sounded quite interesting and I wanted to learn more about it and maybe, also come up with some fun app around the same.

After a little looking around, I came across a great library that does exactly what I was looking for. In fact, it did more than that.

For my initial experimentation, all I wanted was something that can, when I enter some text, tell me whether the text has a negative, positive or neutral. sentiment

[This](https://github.com/davmixcool/php-sentiment-analyzer) is the package I used to make my tiny little Laravel Sentiment Analyzer.

## Creating the App
I have already written more than about how to [create a new Laravel app](https://rajivverma.me/blog/tech/create-new-laravel-project-tailwindcss-livewire/) on my blog, so I am not going to delve into that. If you haven’t already, take a second and go create a fresh Laravel app and then come back to continue.

## Adding the Sentiment Analyzer Package
The Github page of the package itself is pretty self-explanatory but I will quickly summarize the steps anyway.

To bring in the package in your new laravel project, run the following command in the terminal.

`composer require davmixcool/php-sentiment-analyzer`

This is will install the required package, which does all the heavy lifting.

## Implementing The Sentiment Analyzer Package
In your controller, as a first step, import the following:

`use Sentiment\Analyzer;`

Then, in its simplest form, all you need is just a couple of lines of code and you should be done. In this case however, I tried to write a little more than that to make the app a tad bit more meaningful.

    $analyzer = new Analyzer();
     $output_text = $analyzer->getSentiment($request->text_to_analyze);
        $mood        = '';
        if($output_text['neg'] > 0 && $output_text['neg'] < 0.49){
            $mood = 'Somewhat Negative ';
        }
        elseif($output_text['neg'] > 0.49){
            $mood = 'Mostly Negative';
        }

        if($output_text['neu'] > 0 && $output_text['neg'] < 0.49){
            $mood = 'Somewhat neutral ';
        }
        elseif($output_text['neu'] > 0.49){
            $mood = 'Mostly neutral';
        }

        if($output_text['pos'] > 0 && $output_text['pos'] < 0.49){
            $mood = 'Somewhat positive ';
        }
        elseif($output_text['pos'] > 0.49){
            $mood = 'Mostly positive';
        }
        //dd('Negative: ' . $output_text['neg'] . ' Positive: ' . $output_text['pos'] . ' Neutral: '. $output_text['neu']);
        return view('welcome')->with('text',$mood);
    }

In the code above, I pass a line of text via a post request from a blade file. Basically, I just stripped down the default welcome.blade.php of Laravel and added a form with one textbox and a button and used TailWindCSS to make things look better.

`<!DOCTYPE html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <title>Laravel</title>

        <!-- Fonts -->
        <link href="https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700&display=swap" rel="stylesheet">

        <!-- Styles -->
        <style>
            /*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
            html{line-height:1.15;-webkit-text-size-adjust:100%}
            body{margin:0}
            a{background-color:transparent}[hidden]{display:none}
            html{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;line-height:1.5}*,:after,:before{box-sizing:border-box;border:0 solid #e2e8f0}a{color:inherit;text-decoration:inherit}svg,video{display:block;vertical-align:middle}video{max-width:100%;height:auto}.bg-white{--bg-opacity:1;background-color:#fff;background-color:rgba(255,255,255,var(--bg-opacity))}.bg-gray-100{--bg-opacity:1;background-color:#f7fafc;background-color:rgba(247,250,252,var(--bg-opacity))}.border-gray-200{--border-opacity:1;border-color:#edf2f7;border-color:rgba(237,242,247,var(--border-opacity))}.border-t{border-top-width:1px}.flex{display:flex}.grid{display:grid}.hidden{display:none}.items-center{align-items:center}.justify-center{justify-content:center}.font-semibold{font-weight:600}.h-5{height:1.25rem}.h-8{height:2rem}.h-16{height:4rem}.text-sm{font-size:.875rem}.text-lg{font-size:1.125rem}.leading-7{line-height:1.75rem}.mx-auto{margin-left:auto;margin-right:auto}.ml-1{margin-left:.25rem}.mt-2{margin-top:.5rem}.mr-2{margin-right:.5rem}.ml-2{margin-left:.5rem}.mt-4{margin-top:1rem}.ml-4{margin-left:1rem}.mt-8{margin-top:2rem}.ml-12{margin-left:3rem}.-mt-px{margin-top:-1px}.max-w-6xl{max-width:72rem}.min-h-screen{min-height:100vh}.overflow-hidden{overflow:hidden}.p-6{padding:1.5rem}.py-4{padding-top:1rem;padding-bottom:1rem}.px-6{padding-left:1.5rem;padding-right:1.5rem}.pt-8{padding-top:2rem}.fixed{position:fixed}.relative{position:relative}.top-0{top:0}.right-0{right:0}.shadow{box-shadow:0 1px 3px 0 rgba(0,0,0,.1),0 1px 2px 0 rgba(0,0,0,.06)}.text-center{text-align:center}.text-gray-200{--text-opacity:1;color:#edf2f7;color:rgba(237,242,247,var(--text-opacity))}.text-gray-300{--text-opacity:1;color:#e2e8f0;color:rgba(226,232,240,var(--text-opacity))}.text-gray-400{--text-opacity:1;color:#cbd5e0;color:rgba(203,213,224,var(--text-opacity))}.text-gray-500{--text-opacity:1;color:#a0aec0;color:rgba(160,174,192,var(--text-opacity))}.text-gray-600{--text-opacity:1;color:#718096;color:rgba(113,128,150,var(--text-opacity))}.text-gray-700{--text-opacity:1;color:#4a5568;color:rgba(74,85,104,var(--text-opacity))}.text-gray-900{--text-opacity:1;color:#1a202c;color:rgba(26,32,44,var(--text-opacity))}.underline{text-decoration:underline}.antialiased{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.w-5{width:1.25rem}.w-8{width:2rem}.w-auto{width:auto}.grid-cols-1{grid-template-columns:repeat(1,minmax(0,1fr))}@media (min-width:640px){.sm\:rounded-lg{border-radius:.5rem}.sm\:block{display:block}.sm\:items-center{align-items:center}.sm\:justify-start{justify-content:flex-start}.sm\:justify-between{justify-content:space-between}.sm\:h-20{height:5rem}.sm\:ml-0{margin-left:0}.sm\:px-6{padding-left:1.5rem;padding-right:1.5rem}.sm\:pt-0{padding-top:0}.sm\:text-left{text-align:left}.sm\:text-right{text-align:right}}@media (min-width:768px){.md\:border-t-0{border-top-width:0}.md\:border-l{border-left-width:1px}.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1024px){.lg\:px-8{padding-left:2rem;padding-right:2rem}}@media (prefers-color-scheme:dark){.dark\:bg-gray-800{--bg-opacity:1;background-color:#2d3748;background-color:rgba(45,55,72,var(--bg-opacity))}.dark\:bg-gray-900{--bg-opacity:1;background-color:#1a202c;background-color:rgba(26,32,44,var(--bg-opacity))}.dark\:border-gray-700{--border-opacity:1;border-color:#4a5568;border-color:rgba(74,85,104,var(--border-opacity))}.dark\:text-white{--text-opacity:1;color:#fff;color:rgba(255,255,255,var(--text-opacity))}.dark\:text-gray-400{--text-opacity:1;color:#cbd5e0;color:rgba(203,213,224,var(--text-opacity))}.dark\:text-gray-500{--tw-text-opacity:1;color:#6b7280;color:rgba(107,114,128,var(--tw-text-opacity))}}
        </style>

        <style>
            body {
                font-family: 'Nunito', sans-serif;
            }
        </style>
        <script src="https://cdn.tailwindcss.com"></script>

    </head>
    <body class="antialiased">
        <div class="relative flex items-top justify-center min-h-screen bg-gray-100 dark:bg-gray-900 sm:items-center py-4 sm:pt-0">
            @if (Route::has('login'))
                <div class="hidden fixed top-0 right-0 px-6 py-4 sm:block">
                    @auth
                        <a href="{{ url('/home') }}" class="text-sm text-gray-700 dark:text-gray-500 underline">Home</a>
                    @else
                        <a href="{{ route('login') }}" class="text-sm text-gray-700 dark:text-gray-500 underline">Log in</a>

                        @if (Route::has('register'))
                            <a href="{{ route('register') }}" class="ml-4 text-sm text-gray-700 dark:text-gray-500 underline">Register</a>
                        @endif
                    @endauth
                </div>
            @endif

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                    </svg> --}}
                    <h1>Laravel Sentiment Anaylysis POC</h1>
                </div>


                <div class="mt-8 bg-white dark:bg-gray-800 overflow-hidden shadow sm:rounded-lg">
                    <div class="grid grid-cols-1 pr-2">
                        <form class="w-full max-w-sm" action="{{route('analyse.submit')}}" method="POST">
                            @csrf
                            <div class="flex items-center border-b border-teal-500 py-2">
                              <input class="appearance-none bg-transparent border-none w-full text-gray-700 mr-3 py-1 px-2 leading-tight focus:outline-none" type="text"
                              name="text_to_analyze" placeholder="Enter Text To Analyze" aria-label="Enter Text To Analyze" required>
                              <button class="flex-shrink-0 bg-teal-500 hover:bg-teal-700 border-teal-500 hover:border-teal-700 text-sm border-4 text-white py-1 px-2 rounded" type="submit">
                                Analyse
                              </button>
                            </div>
                          </form>
                    </div>
                </div>

                <div class="flex justify-center mt-4 sm:items-center sm:justify-between">
                    <div class="text-center text-sm text-gray-500 sm:text-left" name="mood">
                        {{isset($text) ? 'Your Mood is: ' . $text : 'Nothing entered'}}
                    </div>


                </div>
            </div>
        </div>
    </body>
</html>`

In the web.php route file, I added one route to handle the post request:

`Route::post('analyse', [Controller::class,'analyse'])->name('analyse.submit');`

And that’s it!

The sentiment analyzer app was ready! This is how it looks.

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ei4qf4akf4umb8kocd0t.jpg)

All the code can be found on my GitHub page [here](https://github.com/hackernewbie/sentiment_analysis). Feel free to download and play around with it.

This post was originally posted here - https://rajivverma.me/blog/tech/sentiment-analyser-php-laravel/