1. Make sure your have the correct timezone set in yourconfig/app.php file, as that might be the cause of the appointment notification email being sent at the wrong time.
2. From the time the cron job runs until theCarbon::now() statement is executed, the time might not be exactly what you expect it to be (this is not a certainty and is something that can be affected by what your code does and/or the server load at the time of the execution). So the time might be09:00:01 instead of09:00:00, in which case your condition would not be true anymore (this being another reason why it worked sporadically).
To make sure the time difference doesn't affect the condition you should check if the time is one hour or less from the current time, this would of course require you to set some sort of marker that lets you know if the notification was sent. Also sincewhereDate only compares the date part of the date and time string, there is the need to handle checking the time as well. Since Eloquent doesn't offer any methods for that, you can use the and MySQL function in conjunction withwhereRaw like so:
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About the technologies asked in this question
PHP
PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license. https://www.php.net/
Laravel
Laravel is a free open source PHP framework that came out in 2011. Since then, it has been able to become the framework of choice for web developers. One of the main reasons for this is that Laravel makes it easier, faster, and safer to develop complex web applications than any other framework. https://laravel.com/
MySQL
DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL.
It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information. https://www.mysql.com/
HTML
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone. https://www.w3.org/html/
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