Constructor Property Promotion is a simple shorthand syntax to declare and assign class properties from the constructor. It basically tells the way data has to be treated in code. Constructor Property Promotion is a new syntax provided in the newer version of PHP 8 that allows class property declaration and constructor assignment, variable assignment right from the constructor without getting in the condition of boilerplate code. This avoids having to type the class property name and property type from many to just once. It also avoids using repeated types. Promoted properties can only be used in constructors. Properties will be assigned before the rest of the constructor code is executed.
Named Arguments
Named arguments is a new feature introduced in PHP 8.0, which allows you to pass arguments to a function or method by specifying the parameter name along with the value. This feature provides developers with more flexibility and improves code readability.
Traditionally, in PHP, function parameters are passed by position, which means the order in which arguments are passed to a function must match the order of the parameters in the function signature. In contrast, named arguments allow you to specify which parameter you are passing the argument to, without being constrained by the order.
AMQP Components
- Message Queue
- Exchanges and Exchange Types
- Binding
- Message and Content
- Connection
- Channel
- Virtual Hosts
- AMQP Methods
AMQP
Advanced Message Queuing Protocol (AMQP) is created as an open standard protocol that allows messaging interoperability between systems, regardless of message broker vendor or platform used; With AMQP, you can use whatever AMQP-compliant client library you want, and any AMQP-compliant broker you want. Message clients using AMQP are completely agnostic.
AMQP is an application layer protocol that lets client applications talk to the server and interact. However, AMQP should not just be considered a protocol used for over-the-wire communication; AMQP defines both the network layer protocol and a high-level architecture for message brokers.
It defines a set of messages capabilities which must be made available by an AMQP compliant server implementation (like RabbitMQ). Including rules of how messages must be routed and stored within the broker to follow the AMQ Model.
Last Day Of The Month PHP
<?php
$lastDay = date(‘t’,strtotime(‘today’));
echo $lastDay;
?>
PHP Previous Date
<?php
echo $prev_date = date(‘Y-m-d’, strtotime(date(‘Y-m-d’) .’ -1 day’));
echo $next_date = date(‘Y-m-d’, strtotime(date(‘Y-m-d’) .’ +1 day’));
?>
mysqli::real_connect(): (HY000/1045): Access denied for user ‘phpmyadmin’@’localhost’ (using password: YES)
Add these lines to the file /etc/phpmyadmin/config.inc.php [ubuntu]
$cfg[‘Servers’][$i][‘controluser’] = ‘root’;
$cfg[‘Servers’][$i][‘controlpass’] = ”;
PHP Encapsulation
The wrapping up of data and methods into a single unit (called class) is known as encapsulation. Encapsulation is a protection mechanism for the data members and methods present inside the class. In the encapsulation technique, we are restricting the data members from access to outside world end-user.
In PHP, encapsulation utilized to make the code more secure and robust. Using encapsulation, we are hiding the real implementation of data from the user and also does not allow anyone to manipulate data members except by calling the desired operation.
Variable pools PHP
Variable pools are functional groupings of variables within Service Manager. There are currently four variable pools
Global
A global variable is visible to the entire system. It begins with $G. or $lo..
Local
A local variable is only visible to the RAD application in which it was defined. It begins with $L..
Parameter
A parameter variable is defined on a parameter command panel. It may contain a value passed in from another application. By convention, parameter variables are written in uppercase letters, such as $PHASE or $GROUP.LIST. Parameter variables are invisible to the debugger.
Thread
A thread variable is only visible to the thread in which it was defined. The same variable in different threads has different values, even when the threads are spawned by the same parent.
Cross-Origin Resource Sharing
Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP headers to tell browsers to give a web application running at one origin, access to selected resources from a different origin. A web application executes a cross-origin HTTP request when it requests a resource that has a different origin (domain, protocol, or port) from its own.