Laravel 发送邮件时出现未加括号的表达式错误

Question

我正在尝试发送邮件，但出现以下错误：

The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence

以下是我在控制器中的代码

                Employee::
                    where("organization_id", $billing->organization_id)
                    ->permission([ Permission::BILLINGS_FULL_ACCESS ])
                    ->withAllOrganizations()
                    ->get()
                    ->map(function($employee) use($billing) {
                        Mail::to($employee->work_email)->send(new BillingMail($billing));
                    });

这是我的邮件代码：

class BillingMail extends Mailable

{ 使用 Queueable、SerializesModels；

protected $billing;

/**
 * Create a new message instance.
 *
 * @return void
 */
public function __construct($billing)
{
    $this->billing = $billing->load("organizations", "purchases");
}

/**
 * Build the message.
 *
 * @return $this
 */
public function build()
{
    $pdf = new BillingPDF();
    $pdf->AddSlip($this->billing);
    $pdfName = "Invoice-" . $this->billing->id + 20220301;

    $email = $this->subject("Tankhwa billing")
                ->view('emails.billing')
                ->attachData($pdf->Output('S', $pdfName), $pdfName, [
                    'mime' => 'application/pdf'
                ])
                ->with([
                    "billing" => $this->billing
                ]);
    return $email;
}

我的其他邮件正在发送，它们使用了相同的逻辑，但是这封邮件出错了，请有人帮忙。

Answer 1

问题很可能是在这一行遇到的

$pdfName = "Invoice-" . $this->billing->id + 20220301;

尝试将其更改为

$value = $this->billing->id + 20220301;
$pdfName = "Invoice-" . $value;

更多信息：The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence

Laravel 发送邮件时出现未加括号的表达式错误

Laravel when sending mail giving unparenthesized expressions error

php

laravel

laravel-mail