The Basic PHP Interview Questions and answers for freshers (0-1year)

This post for newbie PHP developer who wants to enter in web development field, Here i have tried to compile The Basic PHP Interview Questions and answers for freshers (0-1year). These common php interview question and answer will help you during technical interview.

The Basic PHP Interview Questions and answers for freshers.

Question: What are the differences between require and include?

Both include and require used to include a file but when included file not found
Include send Warning where as Require send Fatal Error.

Question: In how many ways you can embed PHP code in an HTML page?

below are the markup tags ate are recognised by the PHP Parser.

 Write php code here ?>
    Write php code here ?>
=   Write php code here ?>

Question: Is PHP a case sensitive language?

No, PHP is partially case sensitive.

Question: How to convert array to string in php?

$array = array('cakephp','zend');
$string =implode(' and ',$array);
echo $string;

Question: How to connect mysqli with php using Procedural Way?

$host = "localhost";
$username = "root";
$password = "";
$conn = mysqli_connect($host, $username, $password);
//connect to server
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
echo "Connected successfully";

Question: How to connect mysqli with php using Object-Oriented Way?

$host = "localhost";
$username = "root";
$password = "";
$conn = new mysqli($host, $username, $password);
//connect to server
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
echo "Connected successfully";

Question: How to connect mysqli with php using PDO?

$host = "localhost";
$username = "root";
$password = "";
 $conn = new PDO("mysql:host=$host;dbname=myDB", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected successfully";

Question: How will you define a constant in PHP?

To define a constant you have to use define() function and to retrieve the value of a constant, you have to simply specifying its name. Unlike with variables, you do not need to have a constant with a $.

Question: What is meant by nl2br()?

Inserts HTML line breaks before all newlines in a string.

Question: How can we know the total number of elements of Array?

sizeof($array_var)
count($array_var)
If we just pass a simple var instead of a an array it will return 1.

Question: What are the Different Types of database in Mysql?

There are Five Types of database in Mysql
1)INNODB
2)MYISAM
3)MERGE
4)HEAP
5)ISAM

Question: How can we set and destroy the cookie in php?

By using setcookie(name, value, expire, path, domain); function we can set the cookie in php ;
Set the cookies in past for destroy. like
setcookie(“user”, “sonia”, time()+3600); for set the cookie
setcookie(“user”, “”, time()-3600); for destroy or delete the cookies;

Question: What are PHP magic constants?

PHP provides a large number of predefined constants to any script which it runs known as magic constants.

Question: What is the purpose of break statement?

break terminates the for loop or switch statement and transfers execution to the statement immediately following the for loop or switch.

Question: What is the syntax for ‘foreach’ loop.

he foreach loop works only on arrays, and is used to loop through each key/value pair in an array.

foreach ($array as $value) {
    code to be executed;
}

Question: How to destroy/unset one session?

unset($_SESSION['object']);

Question: How to Destroys all data registered to a session?

Question: How to convert string to uppercase in php?

$string="my public notebook";
echo strtoupper($string);
//Output: MY PUBLIC NOTEBOOK

Question: How to convert string to lowercase in php?

$string="MY PUBLIC NOTEBOOK";
echo strtolower($string);
//Output: my public notebook

Question: Difference between array_merge and array_combine in php?

Example-1: array_merge

$array1 = array('one','two');
$array2 = array(1,2);
$result = array_merge($array1,$array2);
var_dump($result);

Example-2: array_combine

$array1 = array('one','two');
$array2 = array(1,2);
$result = array_combine($array1,$array2);
var_dump($result);

Question: How to get ip address in php?

echo $_SERVER['REMOTE_ADDR'];

Question: What is the purpse $_PHP_SELF variable?

The PHP default variable $_PHP_SELF is used for the PHP script name and when you click “submit” button then same PHP script will be called.

Question: How will you redirect a page using PHP?

Using header function in php

header("location:http://iamrohit.in");

Question: How can we define constants in PHP?

//define constant 
DEFINE('WEBSITE','iamrohit.in'); 
// use constant
echo WEBSITE

If You have more question and answer for 0-1year newbie developer then you can post these questions and answers in the comment box and help new comers.

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