What
Is PHP?
PHP stands for “Hypertext Pre-processors”. It is server side scripting language and
used for developing web applications and It's allows us to dynamically create
generated web pages.
PHP has many frameworks and CMS and used for creating websites. The PHP is very easy to create sites using its
CMS.
The PHP is an Object Oriented Programming (OOPs) language.
Is
multiple Inheritance supported in PHP?
The PHP includes only single inheritance that means a class can be extended only one
single class using extended keyword.
What
was the old name of PHP?
The OLD name of PHP is - Personal Home Page.
Who
Is the father of PHP?
The father of PHP is - Rasmus Lerdorf.
ü Jim
Winstead
ü Stig
Bakken
ü Shane
Caraveo
ü Andi
Gutmans and
ü Zeev
Suraski
What
Is the difference between $name and $$name?
The $name is variable whereas $$name is reference
variable like $name=Anil and $$name=Singh so $Anil value is Singh.
What
is the difference between $var and $$var?
The $var
is a variable with a fixed name. $$var
is a variable whose name is stored in $var.
What
Is the use of "echo" in PHP?
The "echo" used to print a data in the
webpage. Its looks like –
<?php
echo 'Demo apps'; ?>
What
Is PEAR in PHP?
The PEAR stands for PHP Extension and Application
Repository. The PEAR is a framework and repository and used to create the
reusable PHP components. It's also provides a command line interface to install
"packages" automatically.
The main purpose of PEAR -
ü A
structured library of open-sourced code for PHP users
ü A
system for code distribution and package maintenance
ü A
standard style for writing code in PHP
ü PHP
Foundation Classes (PFC)
ü PHP
Extension Community Library (PECL)
What
Is PDO classes in PHP?
The PHP Data Objects (PDO) extension defines a
lightweight, consistent interface for accessing databases in PHP. It is also
data access abstraction layer, so no matter what database we use the function
to issue queries and fetch data will be same.
What
Is Zend Engine?
The Zend Engine is used internally by PHP as a
compiler and runtime engine. The PHP Scripts are loaded into memory and
compiled into Zend opcodes and these opcodes are executed and the HTML
generated is sent to the client.
What
Is the name of scripting engine in PHP?
The scripting engine that powers PHP is called
Zend Engine.
What
are differences in between PHP4 and PHP5?
The PHP4 doesn't support OOPs concept and it’s
using the Zend Engine 1.
The PHP5 supports the OOPs concept and its using
the Zend Engine 2.
How
do you execute a PHP script from the command line?
The PHP command lines interface (CLI) and specify
the file name of the script to be executed as -
php script.php
How
to run the interactive PHP shell from the command line interface?
The PHP CLI program with the option -a as follows
-
php
-a
How
can we display the output directly from the browser?
The tags <?=
and ?> is used to display the
output directly to the browser.
How
To include a file to a PHP page?
The function include () OR require () are using
to include a file to a PHP page.
What
Are the different type of errors in PHP?
In PHP, contains four types of error -
ü Parse Error
– Commonly caused due to syntax mistakes in codes.
ü Fatal Error
– These are basically run time errors which are caused when you try to access
what can’t be done.
ü Notice Error
– These errors occurs when u try to use a variable that hasn’t been declared.
ü Warning Error
– These occurs when u try to include a file that is not present, or delete a
file.
What
Is the differences between include and require function?
The require () function - The file is required,
If file not find - throw Fatal error.
The include () function - If file not find - returns
warning not error.
How
many data types are there in PHP?
The PHP data types are used to hold different
types of data or value and its looks like-
ü Scalar
types
ü Compound
types
ü Special
types
How
many Types of Array in PHP?
There are many array functions -
ü array()
ü array_change_key_case()
ü array_chunk()
ü count()
ü sort()
ü array_reverse()
ü array_search()
ü array_intersect()
How
To declare an Array in PHP?
var
$arr = array('Anil',
'Sunil', 'Sushil');
What
is the use of "ksort" in PHP?
The “ksort” is used to sort an array by key in
reverse order.
What
does $GLOBALS means in PHP?
The $GLOBALS is associative array including
references to all variables which are currently defined in the global scope of
the script.
How
do you define a constant?
The constants can be defined using define ()
directive and its looks like -
define("baseUrl",
'https://code-sample.com');
What
Is use of in_array() function in PHP?
The in_array() function is used check the values
are exists or not in the existing array collection.
What
does $_SERVER means in PHP?
The $_SERVER is an array including information
created by the web server such as paths, headers, and script locations.
What
does $_FILES means in PHP?
The $_FILES is an associative array composed of
items sent to the current script via the HTTP POST method.
How
To set cookies in PHP?
To set cookies in PHP is –
Setcookie("demoApp",
"web", time()+3600);
How
To Retrieve a Cookie Value in PHP?
To Retrieve a Cookie Value is –
echo
$_COOKIE["demoApp"];
How
can we encrypt password in PHP?
The md5 (), sha1 () and base64_encode ()
functions are used to encrypt the username and password. We can encrypt the
password to a degree with md5 () and the md5 () function would be the best.
Example
- As for encryption i would personally use md5 () and a salt.
<?php
$user = "AnilSingh";
$pass = "Buy
a dring first.";
$salt = "asdfghjkl!";
$enc_pass = md5(md5($user
. $pass) . $salt);
?>
What
Are the differences in explode () and str_split () functions?
The str_split() function splits a string into
array by using the regular expression.
The explode() function splits a string into array
by using the string.
What's
a header () function in PHP?
The header () function is used to sends a raw
HTTP header to the client browser.
How
to set HTTP header to UTF-8 using?
header(‘Content-Type:
text/html;
charset=utf-8’);
What
Is session in PHP?
The Session is a super global variable that
preserve the data across subsequent pages. The Session uniquely defines every
user with a session ID and its helps to managing the web apps.
The session_id()
returns the session id for the current session.
How
can we register the variables into a session?
<?php
session_register($ur_session_var);
?>
How
can we destroy a session in PHP?
<?php
session_destroy();
?>
What
Is cookie in PHP?
The Cookie is a small piece of information that
stored in the client browser and also used to identify a user using the
information stored in their browsers.
What
Are differences in ID and class in CSS?
The ID can be used to identify one element but
class can be identifying more than one.
The difference between an ID and Class is that an
ID can be used to identify one element, whereas a class can be used to identify
more than one.
What
Are differences in unset() and unlink() function in PHP?
The unset()
function is used to destroy a variable and the unlink() function is used to destroy a file.
What
does isset() function?
The isset() function is used to checks, the
variable is defined and not null.
How
can we submit a form without using submits buttons?
document.getElementById("MyformIds").submit();
document.formname.submit();
What
are the methods available in form submitting?
The GET and POST are used to submitting a form.
How
can we get the browser properties using PHP?
<?php
echo $_SERVER[‘HTTP_USER_AGENT’].”\n\n”;
$browser=get_browser(null,true);
print_r($browser);
?>
What
are predefined classes in PHP?
The predefined classes are -
ü Directory
ü stdClass
ü __PHP_Incomplete_Class
ü exception
ü php_user_filter
What
are magic methods in PHP?
The Magic methods always start with “__” and
Magic methods are member functions that are available to all the instance of
class.
The Magic Methods are -
ü __call()
ü __toString()
ü __sleep()
ü __wakeup()
ü __isset()
ü __unset()
ü __autoload()
ü __clone()
ü __construct()
ü __destruct()
ü __set()
ü __get()
What's
use of __sleep and __wakeup in PHP?
The __sleep
returns the array of all the variables than need to be saved, while __wakeup retrieves them.
What
Are the difference between $message and $$message?
The $message
stores variable data and the stored data can be fixed while $$message is used to store variable of
variables and the stored data may be changed dynamically.
How
can I execute an anonymous function in PHP?
call_user_func(function()
{ echo ‘anonymous
function called.’;
});
How
To send an email In PHP?
Send an email in PHP using the mail () function and It contain five
parameters - $to, $subject, $message and $headers. The $message and $headers
are optional parameters.
Example -
<?php
mail($to,$subject,$message,$headers);
?>
What
is the difference between characters \034 and \x34?
The \034 is octal 34 and \x34 is hex 34.
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