Handling MongoDB PHP Errors

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git clone https://github.com/mongodb-developer/php-error-handling-sample

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cd php-error-handling-sample

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composer install

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// MongoDB Extension check, Method #1
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if ( extension_loaded('mongodb') ) {
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    echo(MSG_EXTENSION_LOADED_SUCCESS);
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} else {
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        echo(MSG_EXTENSION_LOADED_FAIL);
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}
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// MongoDB Extension check, Method #2
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if ( !class_exists('MongoDB\Driver\Manager') ) {
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    echo(MSG_EXTENSION_LOADED2_FAIL); 
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    exit();
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} 
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else {
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    echo(MSG_EXTENSION_LOADED2_SUCCESS);
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}

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// MongoDB PHP Library check
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if ( !class_exists('MongoDB\Client')  ) {
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    echo(MSG_LIBRARY_MISSING); 
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    exit();
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} 
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else {
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    echo(MSG_LIBRARY_PRESENT);
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}

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// Fail if the MongoDB Extension is not configuired and loaded
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// Fail if the connection URL is wrong
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try {
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    // IMPORTANT: replace with YOUR server DNS name
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    $mdbserver = 'serverlessinstance0.owdak.mongodb.net';
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    $client = new MongoDB\Client('mongodb+srv://'.$_ENV['MDB_USER'].':'.$_ENV['MDB_PASS'].'@'.$mdbserver.'/?retryWrites=true&w=majority');
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    echo(MSG_CLIENT_SUCCESS);
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    // succeeds even if user/password is invalid
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}
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catch (\Exception $e) {
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    // Fails if the URL is malformed
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    // Fails without a SVR check
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    // fails if the IP is blocked by an ACL or firewall
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    echo(MSG_CLIENT_FAIL);
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    exit();
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}

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try { 
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        // if listDatabaseNames() works, your authorization is valid
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        $databases_list_iterator = $client->listDatabaseNames(); // asks for a list of database names on the cluster
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        $databases_list          = iterator_to_array( $databases_list_iterator );
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        echo( MSG_CLIENT_AUTH_SUCCESS );
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    }
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    catch (\Exception $e) {
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        // Fail if incorrect user/password, or not authorized
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        // Could be another issue, check content of $e->getMessage()
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        echo( MSG_EXCEPTION. $e->getMessage() );
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        exit();
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    }

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// check if our desired database is present in the cluster by looking up its name
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    $workingdbname = 'sample_analytics';
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    if ( in_array( $workingdbname, $databases_list ) ) {
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        echo( MSG_DATABASE_FOUND." '$workingdbname'<br>"  );
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    }
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    else {
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        echo( MSG_DATABASE_NOT_FOUND." '$workingdbname'<br>"  );
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        exit();
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    }
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    // check if your desired collection is present in the database
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    $workingCollectionname      = 'customers';
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    $collections_list_itrerator = $client->$workingdbname->listCollections();
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    $foundCollection            = false;
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    $collections_list_itrerator->rewind();
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    while( $collections_list_itrerator->valid() ) {
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        if ( $collections_list_itrerator->current()->getName() == $workingCollectionname ) {
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            $foundCollection = true;
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            echo( MSG_COLLECTION_FOUND." '$workingCollectionname'<br>"  );
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            break; 
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        }
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        $collections_list_itrerator->next();
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    }
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    if ( !$foundCollection ) {
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        echo( MSG_COLLECTION_NOT_FOUND." '$workingCollectionname'<br>"  );
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        exit();
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    }