Top php Interview Questions and Answer 2022: The full name of PHP is Hypertext Preprocessor. php is a server-side language which means that when the php code is run, the code is run on the server-side and the results are displayed in the browser. php interview questions for 5 years experience.
PHP files are created in Notepad in the same way as HTML files. Notepad currently has some updated versions of software that use PHP code. Just like HTML file extensions is “.html”, there is an php extension. PHP file extensions name is “.php”.
Also Read: CSS Interview Questions and Answers 2022
A php file contains HTML code, CSS code, JavaScript, text, images and php code. Since php is an operational script, php code runs on server-side. When php code is run it is run on server-side and the result is displayed in HTML format in our web browser. php basic interview questions.
Like all other software, new versions of php are being updated day after day. They are – php 1.0, php 2.0, php 3.0, php 4.0, php 4.1, php 4.2, php 4.3, php 4.4, php 5.0, php 5.1, php 5.2, php 5.3, php 5.4, php 5.5, php 5.6, php 6.xyz (it’s did Not released), php 7.0, php 7.1, php 7.2, php 7.3, php 7.4, php 8.0, php 8.1,
Top php Interview Questions and Answer
In today’s article we will discuss below all the top PHP related questions that are asked in PHP interviews. Friends, since php is an operational coding. So a lot of queries can be created in php. But in this article we will discuss some of the main questions and answers related to php. php interview questions for 5 years experience.
#1 What is the full name of php?
The full name of PHP is Hypertext Preprocessor. php is a server-side language coding. php coding is used for all types of logical operations.
#2 What is the extension name of the php file?
The PHP code extension name is- “.php”. When we look at a file extension name “.php”, we understand that it is a PHP file.
#3 Where the php file is created?
PHP files are created in the PHP Editor. For example – Notepad, currently used many update php editors (Notepad ++).
#4 How php code starts and ends?
The php code starts and ends like-
<?php
// Here your all php code
?>
OR
<?
// Here your all php code
?>#5 We can use HTML code without PHP code in a PHP file?
Yes, we can. for example-
<?php
echo"
<center>
<h1>Welcome to Blogging Post</h1>
</center>
<div style='text-align:center;'> We can used all types html code in a php file </div>
";
?>
OR
<?php
// php code here
?>
<center>
<h1>Welcome to Blogging Post</h1>
</center>
<div style='text-align:center;'> We can used all types html code in a php file </div>
#6 Will support CSS code in php file?
Yes, php file will support CSS code. We can use all kinds of CSS code in a php file as per our requirement. For example –
<?php
echo"
<center>
<h1>Welcome to Blogging Post</h1>
</center>
<style>
.test{
test-size:22px;
color:red;
}
</style>
<div class='test'> We can used all types html code in a php file </div>
";
?>
OR
<?php
// php code here
?>
<center>
<h1>Welcome to Blogging Post</h1>
</center>
<style>
.test{
test-size:22px;
color:red;
}
</style>
<div class='test'> We can used all types html code in a php file </div>
#7 How can we display the output directly in the web browser?
To display output directly in the browser, we need to use special tags Like :- <?= and ?>.
Also Read: API Service not Working in live Server php code
#8 How can PHP and HTML interact?
It is possible to create HTML with PHP scripts and pass pieces of information from HTML to PHP.
#9 How can PHP and JavaScript interact?
PHP and JavaScript cannot interact directly. Because PHP is a server-side language and JavaScript is a client-side language.
But, we can exchange variables as PHP can generate JavaScript code to be executed by the web browser, and it is 100% possible to return certain variables to PHP via URL. php basic interview questions
#10 What is needed to use image function?
GD (“GIF Draw” or “Graphics Draw”) library is needed to execute image functions in php file.
#11 What is the include() function?
When a php file need to attach another php file, then we use include() . For example –
<?php
include('database-conn.php'); // Here we connect Database connection php file in a another php file
?>#12 What is the Difference Between “include()” and “require()” functions?
The “require()” function cannot access the file then it ends with a error. But the “include()” function gives a error warning, and the PHP script continues to execute. php basic interview questions
Also Read: php session Code not Working on Live Server – error Fix
#13 How to connect to a MySQL database from a PHP Script?
<?php
$database = mysqli_connect("HOSTNAME", "USER_NAME", "PASSWORD"); mysqli_select_db($database,"DATABASE_NAME");
?>
or
<?php
$servername = "HOSTNAME";
$username = "USER_NAME";
$password = "PASSWORD";
$dbname = "DATABASE_NAME";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
else
{
echo"OK";
}
?>
#14 What is the function mysql_pconnect() ?
The function mysql_pconnect() establish a continuous connection to the database. It means that the connection does not close when the PHP script ends. Please Note – This function is not supported or work in PHP 7.0 version and above.
#15 How can we access the data sent through the URL with the GET method?
Yes, We can access the data sent through the URL with the GET method. Example –
https://www.bloggingpost.org?value=Data&value2=Data2 // Data come from this url
<?php
$your_variable = $_GET["value"];
$your_variable2 = $_GET["value2"];
?>#16 How can access the data sent through POST method?
We can access the data sent this way, useing the $_POST . For Example –
<form action='' method='POST'>
<input name='data' type='text' value='data'>
<input name='data2' type='text' value='data2'>
<input name='submit' type='submit' value='Submit'>
</form>
<?php
$your_variable = $_POST["data"];
$your_variable2 = $_POST["data2"];
?>#17 How to check if a given variable is empty?
It is 100% possible to check empty variable. If you want to check whether a variable has a value or not, you use the empty() function. For example-
<?php
$data = ''; // Empty Value
if($empty($data ))
{
echo"No data Found !";
}else{
}
?>
OR
<?php
$data = 'Blogging Post'; // Value is Blogging post
if($empty($data ))
{
echo"No data Found !";
}else{
echo"Data Found";
}
?>
OR
<?php
$data = 'Blogging Post'; // Value is Blogging post
if(!$empty($data ))
{
echo"Data Found";
}else{
echo"No data Found !";
}
?>We can also verify specific empty data also. We can use them together according to our needs. Where we need to be
#18 What does the unlink() function mean?
The unlink() function work for delete the file. If we want delete any file from any folder we need unlink() function. unlink() function using for delete any Image, any file or any data from any folder. For example –
<?php
// For delete any data we need file location and file name
$file_to_delete = "./your-folder-name/your-file-name";
unlink($file_to_delete);
?>We can use it in different ways in different places according to our needs. This code is used the most, When a web page has the option to upload the file and with it the option to delete the file.
#19 The most convenient hashing method to be used to hash passwords?
The most convenient hashing method to be used to hash passwords is md5, sha1 or sha256 because they are most power full encrypted function. For Example –
<?php
$password = md5('Your@password-here');
echo $password;
?>
OR
<?php
$password = 'Blogging-Post';
$hashed_password = password_hash($password, PASSWORD_DEFAULT);
echo $hashed_password;
?>
OR
<?php
$your_password = "Blogging-Post";
echo "Password is:", $password;
echo "Hashed password using CRYPT_BLOWFISH: ",
password_hash($your_password, PASSWORD_BCRYPT);
echo "\n";
echo "Hashed password using Argon2i: ",
password_hash($your_password, PASSWORD_ARGON2I);
echo "\n";
echo "Hashed password using bcrypt: ",
password_hash($your_password, PASSWORD_DEFAULT);
?>#20 What does accessing a class via :: means?
:: it is used to access static methods. That do not require object initialization.
Also Read: How to use md5 hash in php – what is hash?
#21 What is the definition of a session?
A session is a logical object which is enabling us to preserve temporary data across multiple PHP pages. With a specific data we start a session and we can used it multiple PHP pages for different type operational work. For Example –
<?php
$data = 'userid';
session_start();
$_SESSION['data'] = $data;
?>This session code is used most of the time where or websites that have profile system i.e. login form using username and password to access the profile. Also using this session we can do a variety of tasks according to our needs that are operational. Top php Interview Questions and Answer.
#22 How to initiate a session in PHP page?
Using the session_start() function we activate a session. For Example –
<?php session_start(); ?>
<?php
// Your php code Here
?>
or
<?php
session_start();
// Your php code Here
?>#23 How we can propagate a session id?
We can propagate a session id via cookies or URL parameters. Top php Interview Questions and Answer.
#24 What is the meaning of Persistent Cookie?
Persistent cookie is permanently stored a cookie file on the computer browser’s . Cookies are temporary and when we close the browser Cookies are deleted. php interview questions for 5 years experience.
#25 How to destroy or stop starting session?
Using session_destroy(); function we destroy or stop starting session.
The last few words
In this article today we discuss some of the important questions and answers that php interviews are most often asked. But friends, if any query set of this php code is created, it will be infinite, so in this we have discussed some important questions.
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