Question 1

What are the differences between echo and print?

Accepted Answer

Echo and print are used to print the output in the browser, but echo does not return any value after printing the output and print always returns the boolean value.

Question 2

What is the key difference between an abstract class and an interface?

Accepted Answer

Abstract classes are used with objects that are related to each other. Also, it is easy to implement the common behavior in an abstract class. Interfaces, on the other hand, work with unrelated objects only. Moreover, in PHP, through classes, we can easily implement multiple interfaces but cannot inherit multiple abstract classes.

Question 3

Can you tell me how we increase the maximum execution time of a script in PHP?

Accepted Answer

To increase the maximum execution time in PHP, we need to change the value of the max_execution_time directive in the php.ini file. Suppose, let's say, you want to set the maximum execution time to 1 minute. We can do this by writing this code: max_execution_time= 1

Question 4

Tell me the function used to count the total number of rows returned by any query.

Accepted Answer

We use the mysqli_num_rows() function to count the total number of rows returned by the query.

Question 5

PHP sessions last for how long?

Accepted Answer

PHP sessions last for 1440 seconds, but programmers can change the value of the maximum time for sessions in the gc_maxlifetime directivephp.ini file.

Question 6

Explain the session and a cookie.

Accepted Answer

A session is a global variable that stores session data on the server. Whenever a new session is created, the cookie with the session ID is stored on the user's device. This session data gets removed when users close their browsers. In contrast to cookies, session variables can store more data.

Question 7

Which library do we use in PHP to perform different types of image work?

Accepted Answer

PHP provides a GD library to perform different types of image work that include image rotation, cropping, thumbnailing, and many more.

Question 8

What is PDO?

Accepted Answer

It is a PHP data object. With this PHP, developers can easily switch from one database server to another.

Question 9

What is the role of a garbage collector?

Accepted Answer

The Garbage Collector's main role is to remove all the unnecessary session data that has not been used or accessed for a long time.

Question 10

By using which function can we prevent cross-site scripting (CSS) attacks?

Accepted Answer

To prevent these attacks, we have the Htmlentities() function in PHP.

Question 11

Describe the persistence cookie and show how we declare it.

Accepted Answer

A persistence cookie is a file that is stored permanently in the browser. It is used to track a visitor for long periods. We can declare in our code in this way: setccookie ("cookie_name", "cookie_value", strtotime("+1 years");

Question 12

What does PHP support—multiple inheritances or single inheritances?

Accepted Answer

PHP supports only single inheritances. But if you want to implement the features of multiple inheritances, we can use the interface in PHP.

Question 13

What are the types of errors in PHP?

Accepted Answer

There are four types of errors in PHP:  
 
  Fatal Errors:  This type of error occurs during execution time.

Parse Errors:  Whenever a programmer uses the wrong syntax in the PHP script, then this error occurs.

Notice Errors:  If a programmer misses a minor error in the PHP script and tries to execute the code, then this error will be displayed.

Warning Errors:  This type of error is generated by compilers or interpreters while compiling the PHP script. But despite the fatal error, it does not stop the execution of a script.

Question 14

What is the difference between variables and constants in PHP?

Accepted Answer

In PHP, the value of a variable can be changed during execution. Developers can define variables by only using the assignment. But the constant needs to be defined using the define() function, and its value can't be changed.

Question 15

Is PHP a case-sensitive language?

Accepted Answer

PHP variables are case-sensitive, but their functions are not, due to which it is considered a partially case-sensitive language.

Question 16

Can PHP interact with JavaScript?

Accepted Answer

Yes, it can. PHP can generate JavaScript variables and pass variables using a simple URL.

Question 17

Explain traits.

Accepted Answer

Traits are the alternative to multiple inheritances in PHP. Using this PHP, developers can create reusable code.

Question 18

What are the benefits of using PHP in web development?

Accepted Answer

First, PHP is free to use and easy for beginners. Its cross-platform compatibility allows it to run on multiple operating systems. And finally, it can seamlessly work with MySQL, PostgreSQL, and SQLite.

Question 19

How do we use object-oriented programming (OOP) in PHP?

Accepted Answer

We use OOP in PHP by defining a class with the class keyword, and then we will create an object using the new keyword. With the arrow (->) operator, we can access the properties and methods of the object.

Question 20

How do you implement the singleton in PHP?

Accepted Answer

We can implement this by making the constructor private through the static method; we can access a single instance of the class.

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