Php Interview Questions For 2 Year Experience
Best Interview Questions for PHP Developers with 2 Years of Experience
WHY DOES AN EMPLOYEE HAVE TO SERVE 2 YEARS ON PROBATION
An employee is usually required to serve a probation period of 2 years in order to assess their performance, skills, and behavior within a company. During this time, the employer can determine if the employee is a good fit for the organization and if they meet the required standards. This period also allows the employee to understand the company's culture, expectations, and work processes. It is a crucial time for employers to evaluate the employee's potential and for the employee to prove their capabilities. This probation period ensures that the company invests in the right talent, while also giving the employee a fair chance to showcase their abilities. Hence, it is an important aspect of the hiring process and is essential for the growth of both the employee and the company.
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1 - What is polymorphism in PHP?
Polymorphism in PHP refers to the ability of an object or method to take on multiple forms. It allows different objects to respond to the same message or method in different ways. In simple terms, polymorphism enables objects to have different behaviors while sharing the same interface. This results in more flexible and reusable code, making it easier to make changes and extend functionality.
2) What are the different types of polymorphism in PHP?
There are two types of polymorphism in PHP static polymorphism and dynamic polymorphism. Static polymorphism is achieved through method overloading, where the same method name is used with different parameters. Dynamic polymorphism, on the other hand, is achieved through method overriding, where a child class redefines a method of the parent class.
3) What is the difference between GET and POST methods in PHP?
Both GET and POST are used to send data from a client to a server. However, GET method appends the data to the URL and is limited to a certain amount of characters, making it suitable for sending small amounts of data. On the other hand, POST method sends data in the message body and has no such limitations, making it suitable for sending large amounts of data.
4) What is the use of ‘a’ modifier in preg_replace() function?
The ‘a’ modifier in preg_replace() function allows for matching all occurrences of a pattern in a string, rather than just the first match. It makes the search global, making it suitable for replacing all occurrences of a particular pattern.
5) What are the different error types in PHP?
There are three types of errors in PHP syntax errors, runtime errors, and logical errors. Syntax errors occur when there is a mistake in the code that prevents it from being executed. Runtime errors occur when the code is running and something unexpected happens. Logical errors, also known as bugs, occur when the code runs without errors, but the result is not what is expected.
6) What is the difference between include and require in PHP?
Both include and require are used to include files in a PHP script. However, require is more strict compared to include. If the file cannot be included, require will produce a fatal error and stop the script, while include will only produce a warning and continue executing the code.
7) What is the use of the isset() function in PHP?
The isset() function in PHP is used to check whether a variable is set or not. It returns a boolean value true if the variable is set and false if it is not set. This function is useful for validating user input to ensure that all required fields are filled.
8) What is the use of htmlentities() function in PHP?
The htmlentities() function is used to convert all applicable characters in a string to their corresponding HTML entities. It is useful for encoding special characters, such as <, >, &, and “, to prevent them from being interpreted as HTML tags or causing errors.
9) What are the different types of session management techniques in PHP?
There are two types of session management techniques in PHP cookie based sessions and URL rewriting sessions. In cookie based sessions, the server sets a cookie on the client’s browser to track session information, while in URL rewriting sessions, the session id is appended to the URL.
10) What is the use of count() function in PHP?
The count() function in PHP is used to count the number of elements in an array or the number of characters in a string. It can also be used to count the number of occurrences of a particular value in an array, making it useful for performing various operations on arrays.
11) What is the difference between POST and PUT methods in HTML?
POST method is used to create or update data on the server, while PUT method is used to replace the entire data on the server with the data provided. POST method is more commonly used for web forms, while PUT method is used for REST APIs.
12) How can you secure user input in PHP?
To secure user input in PHP, you can use functions like htmlspecialchars() and strip_tags() to prevent cross site scripting attacks. You can also use prepared statements while interacting with databases to prevent SQL injection attacks.
13) What is the use of the ‘static’ keyword in PHP?
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The ‘static’ keyword in PHP is used to declare static variables and methods. Static variables retain their values even after the function is exited, making them suitable for counters and for caching data. Static methods can be accessed without creating an instance of the class, making them useful for utility functions.
14) What is PDO in PHP?
PDO, or PHP Data Objects, is a PHP extension that provides a consistent interface for accessing databases. It supports various database systems and provides a secure and efficient way to communicate with databases. PDO also helps prevent SQL injection attacks by using prepared statements.
15) What is a session in PHP?
A session in PHP is a way to store information about a user between requests. It uses a session id, usually stored in a cookie, to identify a specific user and maintain their data throughout their visit to a website. Sessions are commonly used to store user login information and track user activity.
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Interview Questions For Java Full Stack Developer
300 Core Java Interview Questions
