Atomcms-edit/app/Models/EmailTemplate.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class EmailTemplate extends Model
{
    protected $table = 'email_templates';

    protected $fillable = [
        'name',
        'subject',
        'body',
        'variables',
        'is_active',
    ];

    protected $casts = [
        'is_active' => 'boolean',
    ];

    public static function getTemplate(string $name): ?self
    {
        return static::where('name', $name)
            ->where('is_active', true)
            ->first();
    }

    public static function render(string $name, array $variables): ?array
    {
        $template = static::getTemplate($name);

        if (! $template) {
            return null;
        }

        $subject = $template->subject;
        $body = $template->body;

        foreach ($variables as $key => $value) {
            $subject = str_replace('{{' . $key . '}}', $value, $subject);
            $body = str_replace('{{' . $key . '}}', $value, $body);
        }

        return [
            'subject' => $subject,
            'body' => $body,
        ];
    }
}