Core PHP Interview Questions and Answers in 2025 (100+ Q&A)

Ques:- Why is PHP-MySQL frequently used for web (Portal) Development?

Right Answer:
PHP-MySQL is frequently used for web development because it is open-source, easy to learn, has a large community, offers excellent performance, and provides seamless integration for dynamic content management. Additionally, it is cost-effective and supports rapid development, making it ideal for building web portals.

Core PHP Team Lead/ Tech Lead

Ques:- How can I reset an array in PHP?

Asked In :-

Right Answer:
You can reset an array in PHP using the `reset()` function. For example:

```php
$array = [1, 2, 3];
reset($array);
```

This will set the internal pointer of the array to the first element. If you want to completely clear the array, you can use:

```php
$array = [];
```

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Ques:- Write the code for upload a video file in PHP.How will YouPlay this in Your Page.?

Asked In :-

Right Answer:
```php
// HTML form for file upload
<form action="upload.php" method="post" enctype="multipart/form-data">
Select video to upload:
<input type="file" name="videoFile" accept="video/*">
<input type="submit" value="Upload Video" name="submit">
</form>
```

```php
// upload.php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$targetDir = "uploads/";
$targetFile = $targetDir . basename($_FILES["videoFile"]["name"]);
$uploadOk = 1;
$videoFileType = strtolower(pathinfo($targetFile, PATHINFO_EXTENSION));

// Check if video file is a actual video or fake video
$check = getimagesize($_FILES["videoFile"]["tmp_name"]);
if($check !== false) {
echo "File is a video - " . $check["mime"] . ".";
$uploadOk

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Ques:- What is the diference between php4 and php5

Asked In :- Lawson,

Right Answer:
The main differences between PHP4 and PHP5 are:

1. **Object-Oriented Programming**: PHP5 has a more advanced and robust object-oriented programming model, including support for visibility (public, private, protected), interfaces, and abstract classes, while PHP4 has a limited OOP model.

2. **Error Handling**: PHP5 introduced exceptions for error handling, allowing developers to manage errors more effectively, whereas PHP4 relied on traditional error handling methods.

3. **Support for PDO**: PHP5 introduced the PHP Data Objects (PDO) extension, which provides a consistent interface for accessing databases, while PHP4 did not have this feature.

4. **Improved XML Support**: PHP5 includes better XML support with the SimpleXML and DOM extensions, enhancing XML manipulation capabilities compared to PHP4.

5. **New Features**: PHP5 introduced new features like the `__autoload()` function, improved support for SOAP, and better support for web services.

Overall, PHP5 is

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Ques:- How do you add a joomla Template in admin panel of joomla? Please mention the steps

Asked In :-

Right Answer:
1. Log in to the Joomla Admin Panel.
2. Go to "Extensions" in the top menu.
3. Click on "Manage" and then select "Install."
4. Upload the template package file (ZIP) using the "Upload Package File" option.
5. Click the "Upload & Install" button.
6. After installation, go to "Extensions" > "Templates" > "Styles."
7. Find your newly installed template in the list and click the star icon to set it as the default template.

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Ques:- How can I use the COM components in php?

Asked In :-

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Ques:- How to select the multiple data in selection button

Asked In :- smec,

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Ques:- What's the diff. between include() and Include_once().

Asked In :- Enovate IT Outsourcing,

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Ques:- What are the differences between procedure-orientedlanguages and object-oriented languages?

Asked In :- Polestar Solutions & Services India LLP, Focus Organisation (India ),

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Ques:- How can you insert javascript in php code?

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Ques:- How will YouPlay a video in Your Page.?

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Ques:- How can we convert asp pages to PHP pages?

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Ques:- In PHP how many size data can upload by default?

Asked In :- Delhi Metro Rail,

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Ques:- What are the advantages of not using any frameworks ?

Asked In :-

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Ques:- How i can integrate merchant payment get way in zen cart? inphp?

Asked In :- VALUEWING CONSULTANCY SERVICES (P),

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Ques:- How does php server identify that the particular session belongs to particular user ? Forex: If two users A and B logged from different machine,separate session files (say 1 and 2) will be created in theserver. But how the php knows that 1 belongs to A and 2belongs to B ?

Asked In :- just group,

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Ques:- Difference between cache and cookie.

Asked In :-

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Ques:- 1. Create student database.2. First page should display the students available in thedatabase. There should be add, edit and delete buttons.3. There should be option to search students by name, code,date of joining, department or combination of these.4. Should have an add/edit screen. Add and Edit should behandled in the same page.5. Delete should ask for confirmation before deleting theactual record.6. Validation should be done in JavaScript as well as php.

Asked In :- ubl,

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Ques:- If the variable $a is equal to 5 and variable $b is equal tocharacter a, what?s the value of $$b? Can anyone explain how's the value of $$b=100

Asked In :-

Core PHP Team Lead/ Tech Lead

Ques:- What is the difference between InnoDb tables and MyIsamTables in php

Asked In :-

The Core PHP category on takluu.com is designed for developers preparing for interviews that test their understanding of PHP fundamentals and server-side scripting. Core PHP forms the backbone of many web applications, enabling developers to create dynamic, interactive, and database-driven websites.

This section covers important topics such as PHP syntax, variables, data types, control structures, functions, arrays, sessions, cookies, file handling, and error handling. Additionally, it delves into working with forms, connecting to databases using MySQLi or PDO, and implementing security best practices like input validation and SQL injection prevention.

Interview questions often include practical coding problems, debugging scenarios, and explanations of how PHP interacts with the web server and databases. Understanding how to write clean, maintainable code and optimize PHP scripts for performance is also emphasized.

Candidates aspiring for roles like PHP Developer, Backend Developer, or Full Stack Developer will benefit from detailed tutorials, common interview questions, and real-world examples focused on Core PHP concepts.

At Takluu, we focus on building a strong foundation in Core PHP, enabling you to handle coding rounds confidently and develop scalable web solutions.

Whether you are a beginner or looking to refresh your PHP skills, this category provides comprehensive learning material and interview preparation tips to help you succeed.

Questions in: Core PHP

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