Recoverable fatal error: Object of class SendGrid\Mail\Mail could not be converted to string

Question

我正在尝试使用 SendGrid 的 PHP 库传递动态值。当我传入一个字符串但我添加一个动态值时它起作用，我得到这个错误 可恢复的致命错误：class SendGrid\Mail\Mail 的对象无法在第 30 行的 C:\xampp\htdocs\new\vendor\sendgrid\sendgrid\lib\helper\Assert.php 中转换为字符串

这个有效

$email = new \SendGrid\Mail\Mail(); 
$email->setFrom("support@example.com", "example");
$email->setSubject("IMPORTANT: Signal failure");
$email->addTo("user@exampl.com", "{$fname}");
$email->addContent("text/plain", "{$message}");
$email->addContent(
    "text/html", "{$message}"
);
$sendgrid = new \SendGrid('APIKEY');
try {
    $response = $sendgrid->send($email);
    print $response->statusCode() . "\n";
    print_r($response->headers());
    print $response->body() . "\n";
} catch (Exception $e) {
    echo 'Caught exception: '. $e->getMessage() ."\n";
}

这个失败了

 $email = new \SendGrid\Mail\Mail(); 
    $email->setFrom("support@example.com", "example");
    $email->setSubject("IMPORTANT: Signal failure");
    $email->addTo("{$email}", "{$fname}"); //this line causes the error
    $email->addContent("text/plain", "{$message}");
    $email->addContent(
        "text/html", "{$message}"
    );
    $sendgrid = new \SendGrid('APIKEY');
    try {
        $response = $sendgrid->send($email);
        print $response->statusCode() . "\n";
        print_r($response->headers());
        print $response->body() . "\n";
    } catch (Exception $e) {
        echo 'Caught exception: '. $e->getMessage() ."\n";
    }

如有任何建议，我们将不胜感激 谢谢

Answer 1

在失败的示例中，$email 不是包含电子邮件地址的字符串。它是 \SendGrid\Mail\Mail().

的实例

Calling it as a string won't work, because it looks like \SendGrid\Mail\Mail() does not implement the Stringable interface.

您可以通过使用更好的变量名来防止此类事故发生，例如

$mailer = new \SendGrid\Mail\Mail();

或

$sendGridMail = new \SendGrid\Mail\Mail();