<?php
/*
* google_natural_language_sentiment_analysis.php
*
* @(#) $Id: google_natural_language_sentiment_analysis.php,v 1.7 2024/01/10 11:21:43 mlemos Exp $
*
*/
/*
* Get the http.php file from http://www.phpclasses.org/httpclient
*/
require('http.php');
require('oauth_client.php');
/*
* Initialize the OAuth client class.
*
*/
$client = new oauth_client_class;
$client->server = 'Google';
/*
* Set the debug variable to true only if there is something wrong you
* need to understand and fix.
*
*/
$client->debug = false;
$client->debug_http = true;
$client->redirect_uri = 'https://'.$_SERVER['HTTP_HOST'].
dirname(strtok($_SERVER['REQUEST_URI'],'?')).'/google_natural_language_sentiment_analysis.php';
/*
* Set the client_id and client_secret with credentials obtained from the Google Cloud Console
*
*/
$client->client_id = ''; $application_line = __LINE__;
$client->client_secret = '';
if(strlen($client->client_id) == 0
|| strlen($client->client_secret) == 0)
die('Please go to Google APIs console page '.
'https://console.cloud.google.com/apis/library/language.googleapis.com in the API access tab, '.
'create a new client ID, and in the line '.$application_line.
' set the client_id to Client ID and client_secret with Client Secret. '.
'The callback URL must be '.$client->redirect_uri.' but make sure '.
'the domain is valid and can be resolved by a public DNS.');
/* API permissions
*/
$client->scope = 'https://www.googleapis.com/auth/cloud-language'.' '.
'https://www.googleapis.com/auth/userinfo.profile';
/*
* Initialize and call the PHP OAuth client class to call the Google
* Natural Language API.
*
*/
if(($success = $client->Initialize()))
{
if(($success = $client->Process()))
{
if(strlen($client->authorization_error))
{
$client->error = $client->authorization_error;
$success = false;
}
elseif(strlen($client->access_token))
{
/*
* Call the Google account user profile API to get the user name
*
*/
$success = $client->CallAPI(
'https://www.googleapis.com/oauth2/v1/userinfo',
'GET', array(), array('FailOnAccessError'=>true), $user);
if($success)
{
/*
* Check if the form to enter the text to analyzed
* was submitted.
*
*/
if(IsSet($_POST['text']))
{
/*
* Compose the object with the details for the
* sentiment analysis API call.
*
*/
$document = new stdClass;
$document->content = $_POST['text'];
$document->language = 'en';
$document->type = 'PLAIN_TEXT';
$sentiment_analysis_request = new stdClass;
$sentiment_analysis_request->document = $document;
$sentiment_analysis_request->encodingType = 'UTF8';
/*
* Send the sentiment analysis API call.
*
*/
$success = $client->CallAPI(
'https://language.googleapis.com/v1/documents:analyzeSentiment',
'POST', array(), array(
'FailOnAccessError'=>true,
'RequestContentType'=>'application/json',
'RequestBody'=>json_encode($sentiment_analysis_request),
), $sentiment_analysis);
}
}
}
}
$success = $client->Finalize($success);
}
if($client->exit)
exit;
if($success)
{
/*
* If all went well, display the page with the sentiment analysis
* results and a form to let the user enter a new text message to
* analyze.
*
*/
?>
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Google Natural Language Sentiment Analysis</title>
</head>
<body>
<h1>Google Natural Language Sentiment Analysis</h1>
<?php
if($client->debug)
{
/*
* Show the Google user account API call results in debug
* mode.
*
*/
echo '<h1>', HtmlSpecialChars($user->name),
', you have logged in successfully with Google!</h1>';
echo '<pre>', HtmlSpecialChars(print_r($user, 1)), '</pre>';
echo '<pre>Access token: ', HtmlSpecialChars($client->access_token), '</pre>';
}
/*
* If the user submitted the form to analyse the sentiments of a
* text message, display the results.
*
*/
if(IsSet($_POST['text']))
{
$analyze_sentiment_score = function($score)
{
if($score >= 0.8)
return 'Clearly Positive';
if($score > 0.1)
return 'Positive';
if($score <= -0.8)
return 'Clearly Negative';
if($score < -0.1)
return 'Negative';
if($score != 0)
return 'Neutral';
return 'Mixed';
};
if($client->debug)
echo '<pre>', HtmlSpecialChars(print_r($sentiment_analysis, 1)), '</pre>';
echo '<h2>Results:</h2>',"\n";
$sentences = count($sentiment_analysis->sentences);
echo '<h3>Sentences: ', $sentences, '</h3>',"\n";
$score = $sentiment_analysis->documentSentiment->score;
echo '<p>Sentiment score: ', $score, ' ', $analyze_sentiment_score($score), '</p>',"\n";
for($sentence = 0; $sentence < $sentences; ++$sentence)
{
echo '<h3>Sentence ', ($sentence + 1), ': ', HtmlSpecialChars($sentiment_analysis->sentences[$sentence]->text->content), '</h3>';
$score = $sentiment_analysis->sentences[$sentence]->sentiment->score;
echo '<p>Sentiment score: ', $score, ' ', $analyze_sentiment_score($score), '</p>',"\n";
}
}
/*
* Show a form to let the user enter a text message to analyse the
* user sentiments.
*
*/
?>
<form method="POST">
<h2><?php echo HtmlSpecialChars($user->name); ?>, please enter a text to analyze:</h2>
<div>
<textarea name="text" rows="6" cols="60"><?php
if(IsSet($_POST['text']))
{
echo HtmlSpecialChars($_POST['text']);
}
?>
</textarea>
</div>
<div>
<input type="submit" value="Analyze">
</div>
</form>
</body>
</html>
<?php
}
else
{
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>OAuth client error</title>
</head>
<body>
<h1>OAuth client error</h1>
<pre>Error: <?php echo HtmlSpecialChars($client->error); ?></pre>
</body>
</html>
<?php
}
?>
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