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To read and send emails using Office 365 with PHP, you'll typically use the Microsoft Graph API. Here’s a step-by-step guide to get you started:

Prerequisites

1. Office 365 Account: Ensure you have an Office 365 account.
2. Azure App Registration: Register an application in Azure AD to get the Client ID, Tenant ID, and Client Secret.
3. PHP Environment: Ensure you have a PHP environment set up.

Steps

1. Register an Application in Azure AD

• Go to the Azure Portal.
• Navigate to "Azure Active Directory" > "App registrations" > "New registration".
• Fill in the required details and register the app.
• Note the Application (client) ID and Directory (tenant) ID.
• Create a Client Secret in "Certificates & secrets" and note it.

2. Set Required API Permissions

• In the registered app, navigate to "API permissions" > "Add a permission".
• Select "Microsoft Graph".
• Add delegated permissions for Mail.Read, Mail.ReadWrite, Mail.Send.

3. Install Microsoft Graph PHP SDK

Install the Microsoft Graph SDK for PHP via Composer:

composer require microsoft/microsoft-graph

4. Authenticate and Get Access Token

Use the OAuth2 authentication flow to get an access token. Here’s an example using the league/oauth2-client package:

composer require league/oauth2-client

Here’s a PHP script to authenticate and get the access token:

<?php
require 'vendor/autoload.php';

use League\OAuth2\Client\Provider\GenericProvider;

$provider = new GenericProvider([
    'clientId'                => 'YOUR_CLIENT_ID',
    'clientSecret'            => 'YOUR_CLIENT_SECRET',
    'redirectUri'             => 'YOUR_REDIRECT_URI',
    'urlAuthorize'            => 'https://login.microsoftonline.com/YOUR_TENANT_ID/oauth2/v2.0/authorize',
    'urlAccessToken'          => 'https://login.microsoftonline.com/YOUR_TENANT_ID/oauth2/v2.0/token',
    'urlResourceOwnerDetails' => '',
    'scopes'                  => 'https://graph.microsoft.com/.default'
]);

// Get the authorization URL
$authorizationUrl = $provider->getAuthorizationUrl();

// Get the state generated for you to store it for later
$state = $provider->getState();

// Redirect to authorization URL
header('Location: ' . $authorizationUrl);

// Get access token
if (isset($_GET['code'])) {
    try {
        // Try to get an access token using the authorization code grant.
        $accessToken = $provider->getAccessToken('authorization_code', [
            'code' => $_GET['code']
        ]);

        echo 'Access Token: ' . $accessToken->getToken();

    } catch (\League\OAuth2\Client\Provider\Exception\IdentityProviderException $e) {
        exit($e->getMessage());
    }
}
?>

5. Use Microsoft Graph SDK to Read and Send Emails

Here's an example script to read and send emails:

<?php
require 'vendor/autoload.php';

use Microsoft\Graph\Graph;
use Microsoft\Graph\Model;

$accessToken = 'YOUR_ACCESS_TOKEN';

$graph = new Graph();
$graph->setAccessToken($accessToken);

// Reading emails
$messages = $graph->createRequest("GET", "/me/mailFolders/inbox/messages")
                  ->setReturnType(Model\Message::class)
                  ->execute();

foreach ($messages as $message) {
    echo $message->getSubject() . "\n";
}

// Sending an email
$sendMailBody = [
    "message" => [
        "subject" => "Meet for lunch?",
        "body" => [
            "contentType" => "Text",
            "content" => "The new cafeteria is open."
        ],
        "toRecipients" => [
            [
                "emailAddress" => [
                    "address" => "example@example.com"
                ]
            ]
        ]
    ]
];

$graph->createRequest("POST", "/me/sendMail")
      ->attachBody($sendMailBody)
      ->execute();

echo "Mail sent!";
?>

Summary

1. Register an application in Azure AD to get the Client ID, Tenant ID, and Client Secret.
2. Set the necessary API permissions for Microsoft Graph.
3. Authenticate using OAuth2 and obtain an access token.
4. Use Microsoft Graph SDK to interact with Office 365 emails.

Ensure you replace placeholders like YOUR_CLIENT_ID, YOUR_CLIENT_SECRET, YOUR_TENANT_ID, and YOUR_ACCESS_TOKEN with your actual credentials and tokens.