Top interview questions to ask while Hiring PHP Developers

Due to the development problems with Unicode support (a major part of PHP 6)

The “@” command is used to suppress error reporting. The @ symbol is used to control the PHP errors. It makes PHP suppress any error messages (notice, warning, fatal, etc) generated by the associated expression

PHP sessions are stored on the server generally in text files in a temp directory of the server. That particular file is not accessible from the outside world

Simply create a custom middleware and use laravel throttle middleware (pre-defined). Check the rate limit of visitor access If the user/visitor exceeded the defined limit immediately put the IP address into the database and check-in custom middleware for each HTTP request.

Migrations are DB VCS and important because they allow you to share applications by maintaining database consistency. Without migration, it is difficult to share any Laravel application. It also allows you to sync the database.

Reverse routing is the process of generating the URL that would lead to a route, given a symbolic reference to the route. u003cbru003eu003cstrongu003eExample:u003c/strongu003eu003cbru003e1 {{ route(‘route-name’) }}

Use laravel queue for multiple tasks. Dispatch job in the queue. When the job is done send the email notification. If you want to display progress in the front-end then use push notification services for real-time updates.

By using custom packages or travel-modules packages, we can build modular applications in laravel.

Query builder is efficient for complex database queries. ORM is a good solution for processing a single entity in a CRUD manner.u003cbru003eu003cstrongu003eComparison:u003c/strongu003eu003cbru003e1- Eloquent ORM (Execution time: 1.41 s, Queries Executed: 1000)u003cbru003e2- Query Builder (Execution time: 938 ms, Queries Executed: 1000)

In order to declare a variable in PHP, the type of the variable is not required. The data type is determined by the value/context of the variable. If an integer value is assigned to the variable $num, then the variable $num is of the type integer. If the string value is assigned to the variable $str, the variable $str is of the typed string.

Hoisting is the JavaScript interpreter’s action of moving all variable and function declarations to the top of the current scope. However, only the actual declarations are hoisted. Any assignments are left where they are.

The Twelve-Factor App methodology is a methodology for building software-as-a-service applications. The 12-Factor App methodology provides a solid framework for organizing your project in order to maintain a healthy and scale-able application. These 12 principles each apply to a subset of your application and will guide you in finding the ideal way to manage your application as a whole. Such as:u003cbru003e1. Codebaseu003cbru003e2. Dependenciesu003cbru003e3. Configurationu003cbru003e4. Backing Servicesu003cbru003e5. Build, release, runu003cbru003e6. Processesu003cbru003e7. Port Bindingu003cbru003e8. Concurrencyu003cbru003e9. Disposabilityu003cbru003e10. Dev/prod parityu003cbru003e11. Logsu003cbru003e12. Admin Processes

It’s an environment variable. By default, auto-commit is set to 1. When auto-commit is set to 1, you cannot run transactions with any of the MySQL table types. In this mode, MySQL treats every SQL statement as its own transaction. To use groups of statements as transactions you need to turn the auto-commit mode off.

The list() function is used to assign values to a list of variables in one operation. It assigns variables as if they were an array.u003cbru003eu003cstrongu003eExampleu003c/strongu003e:u003cbru003eu003cbru003e1 2 3 $info = array(‘coffee’, ‘brown’, ‘caffeine’); // Listing all the variables list($drink, $color, $power) = $info;u003cbru003eu003cbru003eecho u0022$drink is $color and $power makes it special.u003cbru003eu003cbru003eThe compact() function creates an array from variables and their values.u003cbru003eu003cstrongu003eExampleu003c/strongu003e:u003cbru003eu003cbru003e1 2 3 4 5 $firstname = u0022Peteru0022;u003cbru003e$lastname = u0022Griffinu0022;u003cbru003e$age = u002241u0022;u003cbru003e$result = compact(u0022firstnameu0022, u0022lastnameu0022, u0022ageu0022);

Before 2009. There was no uniform method to write code. Some people preferred the Zend framework style of code and some used their own.u003cbru003eIn 2009, a group of people, representing various popular PHP projects came together and formed a recommendation to write and maintain code in a uniform way and it is called PHP Standards Recommendation (PSR).

In PHP, we can define some special functions that will be called automatically. Such functions require no function call to execute the code inside these functions. With this special feature, they can be referred to as magic functions or magic methods. The most popular magic methods are __construct() and __destruct().

The mechanism of grouping things is called taxonomy and items in that group are called terms. For example, the category in WordPress is taxonomy, and items in the category taxonomy, if it is a programming-related website, PHP, C++, Java, Android, or IOS will be called terms.

An active record pattern is an approach to accessing data in a database. A database table or view is wrapped in a class. So an object instance is tied to a single row in the table. The creation of an object leads to row addition, when that object updates, the row in the database gets updated. Objects can access data of each column of a row as of their property.

Custom fields are the extra information attached to the post or page. It is a post/page metadata, which is stored in a post meta table and associated with a post/page and can be accessed anywhere in the theme if provided post/page ID.

$name is a simple variable whereas $$name is the reference variable which uses the value of the variable $name.u003cbru003eu003cstrongu003eExampleu003c/strongu003e:u003cbru003eu003cbru003e$name=u0022Foou0022;u003cbru003e$$name=u0022Baru0022;u003cbru003eecho $name.u0022u0026lt;br/u0026gt;u0022;u003cbru003eecho $$name.u0022u0026lt;br/u0026gt;u0022;u003cbru003eecho $Foo;u003cbru003eu003cbru003eThe output of the following will beu003cbru003eFoou003cbru003eBaru003cbru003eBaru003cbru003eu003cbru003eHere $Foo is translated as $$name because $name value is Foo. So in simple words, Foo replaces $name with $$name.