PHP Backend Developer Interview Questions
The error_reporting() function sets the error_reporting directive at runtime. PHP has many levels of errors, using this function sets that level for the duration (runtime) of your script. If the optional error_level is not set, error_reporting() will just return the current error reporting level.
The explode() function is an inbuilt function in PHP used to split a string into different strings. The explode() function splits a string based on a string delimiter, i.e. it splits the string wherever the delimiter character occurs. This function returns an array containing the strings formed by splitting the original string.
Syntax:
array explode(separator, OriginalString, NoOfElements)
The array_walk() function is an inbuilt function in PHP. The array_walk() function walks through the entire array regardless of pointer position and applies a callback function or user-defined function to every element of the array. The array element’s keys and values are parameters in the callback function.
Syntax:
boolean array_walk($array, myFunction, $extraParam)
A web browser may be the client, and an application on a computer that hosts a website may be the server. A client (browser) submits an HTTP request to the server; then the server returns a response to the client. The response contains status information about the request and may also contain the requested content.
- GET: Requests data from a specified resource.
- POST: Submits data to be processed to a specified resource.
- == Operator: This operator is used to check the given values are equal or not. If yes, it returns true, otherwise it returns false.
Syntax:
operand1 == operand2
- === Operator: This operator is used to check the given values and its data type are equal or not. If yes, then it returns true, otherwise it returns false.
Syntax:
operand1 === operand2
The Model-View-Controller (MVC) framework is an architectural/design pattern that separates an application into three main logical components Model, View, and Controller. Each architectural component is built to handle specific development aspects of an application. It isolates the business logic and presentation layer from each other.
PHP exit() Function: In PHP, the exit() function prints a message and exits the application. It’s often used to print a different message in the event of a mistake. Use exit() when there is not an error and have to stop the execution.
Syntax:
exit("Message goes here");
or
exit();
Example:
exit("This request is processed");
PHP die() Function: In PHP, die() is the same as exit(). A program’s result will be an empty screen. Use die() when there is an error and have to stop the execution.
Syntax:
die("Message goes here");
or
die();
Example:
die('Oops! Something went wrong');
The stdClass is the empty class in PHP which is used to cast other types to object. It is similar to Java or Python object. The stdClass is not the base class of the objects. If an object is converted to object, it is not modified. But, if object type is converted/type-casted an instance of stdClass is created, if it is not NULL. If it is NULL, the new instance will be empty.
When you don’t want to have more than a single instance of a given class, then the Singleton Design Pattern is used and hence the name is – Singleton. Singleton is the design patterns in PHP OOPs concept that is a special kind of class that can be instantiated only once. If the object of that class is already instantiated then, instead of creating a new one, it gets returned.
Spring Boot is built on the top of the spring and contains all the features of spring. And is becoming a favorite of developers these days because of its rapid production-ready environment which enables the developers to directly focus on the logic instead of struggling with the configuration and setup.
Backend Developer Interview Questions
Backend development involves working on the server side of web applications, where the logic, database interactions, and server management take place. It focuses on handling data, processing requests from clients, and generating appropriate responses.
In this Top Backend Development interview questions, We cover Interview questions from all important topics from basic to advanced such as JavaScript, Node.js, Express.js, SQL, MongoDB, Django, PHP, Java Spring, and API. No matter whether you are a fresher or an experienced professional we have got questions that will enhance your skills and help you shine in your backend development interview.
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