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NOVEMBER 23, 2021

Top PHP Interview Questions & Answers


    You have landed on the right site if you're seeking PHP Interview Questions for Freshers or Experienced. Numerous opportunities are accessible internationally from a variety of respected companies. According to the survey, PHP has a market share of around 79.23 percent. As a result, you still have an opportunity to advance your PHP Development profession.

    We've prepared a collection of PHP interview questions submitted by PHP experts. We hope these questions assist you in acing your PHP interview and securing the position of your dreams. If you've previously been through a PHP interview and are unable to discover the same questions here, please care to leave a comment and we'll add them to our PHP interview questions blog so that other students may gain from your experience. Now, let us go on to the QAs.

    The following collection of the Most Frequently Asked PHP Interview Questions and Answers will aid you in preparing for the PHP interview. Take a look at these.

    Q1: What Is The Benefit Of Using PHP Over Another Language?

    1. PHP is open-source and free, hence you can freely download, install and start developing using it.
    2. PHP has a very simple and easy-to-understand syntax, hence the learning curve is smaller as compared to other scripting languages like JSP, ASP, etc.
    3. PHP is cross-platform, hence you can easily develop and move/deploy your PHP code/project to almost all the major operating systems like Windows, Linux, Mac OSX, etc.
    4. All the popular web hosting services support PHP. Also, the web hosting plans for PHP are generally amongst the cheapest plans because of their popularity.
    5. Popular Content Management Systems like Joomla, Drupal, etc are developed in PHP and if you want to start your own website like Studytonight, you can easily do that with PHP.
    6. With PHP, you can create static and dynamic webpages, perform file handling operations, send emails, access and modify browser cookies, and almost everything else that you might want to implement in your web project.
    7. PHP is fast as compared to other scripting languages like JSP and ASP.
    8. PHP has in-built support for MySQL, which is one of the most widely used Database management systems.

    Q2: Is PHP A Strictly Typed Or An Openly Typed Language?

    PHP is a scripting language with a weakly typed syntax. This means that, in contrast to other programming languages such as Java and C, we do not need to define the kind of data that will be stored in a variable. PHP automatically takes care of things for us, depending on the data we maintain.

    Q3: Is PHP A Case-Sensitive Programming Language?

    To a certain extent, PHP is case-sensitive. This indicates that although variables are case sensitive, function names are not. If a function is defined with a lowercase name, it may also be called with an uppercase name. It is recommended, however, to consider it as a case-sensitive language and to ensure that both the declaration and the calling use the same letter case.

    Q4: What Is Pear In PHP?

    It is a framework and a repository for reusable PHP components. The abbreviation "PHP Extension and Application Repository" refers to "PHP Extension and Application Repository". PEAR's mission is to provide PHP developers with a uniform code style and an organized library of open-source solutions.

    Q5: What Is The Distinction In PHP Between The Operators "==" And "==="?

    Two variables are compared using the operator "==". Although "===" returns true if the variables are identical regardless of their type, it also compares variables. However, it is rather specific about the variable data types.

    Equal == It returns true if both the arrays have same key/value pairs. $a == $b
    Identical === It returns true if both the arrays have same key/value pairs, in same order and of same type. $a === $b

    Q6: Explain The Distinction Between The include() And need() Functions.

    Both functions make it possible to include external files inside a PHP file. If the provided file cannot be identified, the distinction is made. include() will display a warning and resume execution of the script. While need() produces a fatal error and terminates the application, need() does not.

    Q7: How Are The include() And Include Once() Functions Different?

    Both functions make it possible to include external files inside a PHP file. They differ in one respect. By using include once(), we guarantee that the previously included code is not repeated. This specifies that include once() will include a file just once.

    Q8: What Is The Difference Between The GET And POST Methods?

    GET and POST are the two methods used to handle form requests.

    • GET: When we provide data to a server using GET, the data is shown in the URL. We often use it to retrieve data since it is not a secure technique of allocating it. It only accepts ASCII data and has a maximum URL length of 2048 characters.
    • POST: The parameter for the POST request is not visible in the URL. It is used to communicate with the server and convey sensitive data. It is compatible with ASCII, binary data, and a range of other data formats. POST has no length restrictions.

    Q9: How Many Distinct Types Of Errors Does PHP Support?

    There are four main categories of error.

    • Fatal Error: This error ends the program's execution and is classified as a critical error. We will get a fatal error if we try to execute a function that has never been declared.
    • Parse Error: Also known as a syntax mistake. This occurs as a consequence of missing quotes, parentheses, or semicolons.
    • Warning Error: This mistake does not result in the script's termination. It just signals the existence of a condition that has the potential to deteriorate into something more significant in the future. This may occur when we try to include a file that does not exist in the provided directory or when we call a function with the wrong amount of parameters.
    • Notice Error: This kind of error is similar to a warning error in that it does not cause the program to stop. This is often the case when we try to access a variable that does not exist.

    Q10: Differentiate Between PRINT AND ECHO?

    Both functions are used to generate an image on the screen. They do, however, differ in the following respects.

    Whereas echo allows several parameters, print only accepts one.

    The print command produces a single value, while the echo command returns null. That is why owing to its quickness, echo is often preferred over other approaches.

    Q11: What Is PHP'S Juggling Of Types?

    When declaring a variable in PHP, we do not need to define the data type. This is why the language is regarded as being loosely typed. If the declaration of a variable has an integer value, the variable will be of type integer. Similarly, if a variable is allocated a string value, the variable is assigned the typed string.

    Q12: Shortly Explain The Framework. Furthermore, Tell Us Of The Most Popular PHP Frameworks.

    Developing an application from the ground up requires considerable time and work. It is possible that you may require to recreate a function that has been called several times. Frameworks provide us with a collection of libraries and functionalities that we can include in our application fast and easily. PHP frameworks give us well-organized and reusable components that allow us to begin constructing our applications instantly.

    Several of the most frequently used frameworks are as follows:

    • Laravel: At the present, Laravel is the most popular PHP framework. Laravel is a framework that includes all of the functionality required for constructing a modern PHP application. Laravel includes access to authentication, cookies, routing, and session management services, which significantly reduces initial work.
    • CodeIgniter: This is the smallest framework available for PHP. Due to its small size of less than 2 MB, including documentation, it is perfect for developing dynamic web applications.
    • Symfony: It is very adaptable. Additionally, it is employed to complete large-scale projects. This framework is, however, mostly used by experienced developers and programmers.

    Q13: What Is Constant In PHP? And How Will You Define It?

    Constants are used to express a permanent value, as the name suggests. As a consequence, we are unable to modify a constant's value. The constant is defined using the define() method. And all we require to do is supply the value's name. Constants must begin with one of the following characters: a letter or an underscore.

    Q14: Differentiate Between $STR And $$STR In PHP?

    $str is a standard variable that can contain any data type, including string, float, boolean, and char. Alternatively, $$str is a reference variable whose name is included inside $str.

     $str = "Studytonight";
     $refStr = "str";
     echo $refStr."<br>";
     echo $$refStr;



    Q15: What Is The Purpose Of The Print R() Functions?

    print r() is a built-in function that, like echo and print, displays the provided data. It does, however, output the data in an understandable way.


    We've covered PHP technical interview questions in this post. We hope these PHP interview questions have boosted your confidence in preparation for any interview. Maintain a calm and optimistic demeanor during your big day, since comprehension of technical subjects is not sufficient; your presentation is equally critical.

    Adarsh Kumar Singh is a technology writer with a passion for coding and programming. With years of experience in the technical field, he has established a reputation as a knowledgeable and insightful writer on a range of technical topics.