Introduction to PHP Interview Questions and Answers
All of you may remember that the internet development market is growing like something, particularly the web application programmers are the first beneficiaries of this growth. Hence, most of them tend to find out technologies like PHP, HTML/CSS, JavaScript, AngularJS, and NodeJS. PHP developers are still in high demand for online web application development. And there are a lot of high-end enterprise-level websites created by PHP.
So if you have finally found your dream job in PHP but are wondering how to crack the PHP Interview and what could be the probable 2023 PHP Interview Questions, every interview is different, and the job scope is different too. Keeping this in mind, we have designed the most common PHP Interview Questions and Answers to help you get success in your interview.
Below are the 10 important 2023 PHP Interview Questions and Answers frequently asked in an interview. These questions are divided into two parts as follows:
Part 1 – PHP Interview Questions (Basic)
This first part covers basic PHP Interview Questions and Answers:
Q1. Compare PHP & Java.
Answer:
| Criteria | PHP | Java |
| Deployment area | Server-side scripting | General-purpose programming |
| Language type | Dynamic typed | Static typed |
| Rich set of APIs | No | Yes |
Q2. What Are PHP Traits?
Answer:
These are the common PHP Interview Questions asked in an interview. It is a mechanism that enables us to try and do code reusability in a single inheritance language, such as PHP. Its structure is similar to that of PHP code, simply that it’s a bunch of reusable functions. Despite having the same name, they all have separate declarations resulting in code duplicity. We will make PHP Traits by clustering these functions. The class will use this attribute to incorporate the tasks outlined in it.
Q3. Why do we tend to Use Extract() In PHP?
Answer:
The extract() imports variables from an array into the local symbol table. It uses variable names as array keys and variable values as array values. for every component of an array, it creates a variable within the same symbol table.
Following is the syntax.
extract(array,extract_rules,prefix)Q4. What are the most common errors in PHP?
Answer:
The most common types of runtime errors in PHP are as follows:
a. Notices: By default, these errors don’t seem to be flaunted to the user the least bit – though you’ll be able to modify this default behavior. These include non-critical trivial errors.
For example, accessing a variable that has not yet been outlined
b. Warnings: By default, these errors are visible to the user; however, they do not lead to script termination. These include a lot of serious errors.
For example, attempting to include () a file that does not exist
c. Fatal Errors: These errors immediately cause the script’s termination, and PHP’s default behavior is showing them to the user. These include critical errors
For example, instantiating an object of a non-existent class.
Q5. What Is PDO in PHP?
Answer:
PDO stands for <PHP Data Object>.
It is a group of PHP extensions that give a core PDO class and database-specific drivers. It provides a vendor-neutral, lightweight, data-access abstraction layer. Thus, despite what database we use, the function to issue queries and fetch data will be the same.
It focuses on data access abstraction rather than database abstraction. PDO needs familiarised options within the core of PHP 5. Therefore, it’ll not run with earlier versions of PHP.
PDO divides into two components.
- The core that provides the interface.
- Drivers to access explicit drivers.
Part 2 – PHP Interview Questions (Advanced)
Let us now have a look at the advanced PHP Interview Questions.
Q6. How do you get the information about the uploaded file in the receiving script?
Answer:
Once the web application server receives the file after uploading, it calls the PHP script to process it. This receiving PHP script will get the data of the uploaded file exploitation of the predefined array known as $_FILES. PHP arranges this data in $_FILES as a two-dimensional array.
We will retrieve it as follows:
- $_FILES[$fieldName][‘name’]: It represents the file name on the browser system.
- $_FILES[$fieldName][‘size’]: It represents the scale of the go in bytes.
- $_FILES[$fieldName][‘tmp_name’]: It offers the temporary computer file name that the uploaded file got hold of on the server.
- $_FILES[$fieldName][‘error’]: It returns the error code related to this file transfer.
The $fieldName is that the name utilized in the <input type=”file” name=”<?php echo $fieldName; ?>”>
Q7. What’s the distinction between Split And Explode functions for string manipulation in PHP?
Answer:
Both of them perform the task of extracting a String. However, the tactic they use is entirely different. The split() function splits the string into an array employing a regular expression and returns an array.
For Example:
split(:May:June: July);
Returns an array that contains May, June, July.
The explode() function splits the String using a String delimiter.
For Example:
explode (and May and June and July);
It also returns an array that contains May, June, July.
Q8. Define PEAR in PHP.
Answer:
PEAR stands for “PHP Extension and Application Repository.” PEAR is the next revolution in PHP. PEAR is used to install “packages automatically”, and PEAR could be a framework and distribution system for reusable PHP components.
The purpose of PEAR is to provide:
- For PHP users, it is a structured library of open-sourced code.
- It is a system for code distribution and package maintenance.
- PHP Foundation categories (PFC).
- PHP Extension Community Library (PECL).
Q9. What library is used for PDF in PHP?
Answer:
These are the most popular PHP Interview Questions asked in an interview. The PDF functions in PHP will produce PDF files exploiting the PDFlib library Version 6. PDFlib offers an object-oriented API for PHP 5 and a function-oriented API for PHP 4. There is also the » Panda module. FPDF is a PHP class that permits generating PDF files with pure PHP (without using the PDFlib library.) F from FPDF stands for Free: you’ll use it for any quiet usage and modify it to fit your desires. FPDF needs no extension to work with PHP4 and PHP5.
Q10. How do you avoid emails sent through PHP getting into the spam folder?
Answer:
There’s no particular methodology for keeping your emails from being known as spam. But we will contemplate some points that cause this downside.
Let me explain a few common reasons.
1. Sending mail using the `mail` function with minimum parameters.
To avoid this case, we should use all potential mail headers like `MIME-version,` `Content-type,` `reply address`, `from address`, etc..
2. Not employing a correct SMTP mail script like PHP mailer or SwiftMailer with Associate in Nursing actual email credentials and the username, watchword, etc.
If we tend to send emails from an actual email account using an SMTP mailer script with a username and password, then we will avoid
If you’re on a shared web server, consider buying a unique IP address for yourself; as a result, others using your IP may have gotten your IP blocklisted for spam. Do not send more than 250 emails to every supplier per hour.
Give your users an unsubscribe link; if they can’t see the email, prcorrectlythey’ll mark you as spam.
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This has been a guide to PHP Interview Questions for Experienced candidates. Here we have listed the top 10 Interview Questions and Answers commonly asked in interviews with detailed responses. If you need skilled professionals for your project, consider hiring PHP developers to enhance your development team. You may also look at the following articles to learn more –
