21-10-2016, 10:01 AM
1460267244-top100phpinterviewquestionsanswers.pdf (Size: 268.12 KB / Downloads: 9)
1) What is PHP?
PHP is a web language based on scripts that allows developers to dynamically create
generated web pages.
2) What does the initials of PHP stand for?
PHP means PHP: Hypertext Preprocessor.
3) Which programming language does PHP resemble to?
PHP syntax resembles Perl and C
4) What does PEAR stands for?
PEAR means "PHP Extension and Application Repository". it extends PHP and provides a
higher level of programming for web developers.
5) What is the actually used PHP version?
Version 5 is the actually used version of PHP.
6) How do you execute a PHP script from the command line?
Just use the PHP command line interface (CLI) and specify the file name of the script to be
executed as follows:
[crayon-55b9e4c229d84612822204/]
7) How to run the interactive PHP shell from the command line interface?
Just use the PHP CLI program with the option -a as follows:
[crayon-55b9e4c229d9c051120890/]
8) What are the correct and the most two common way to start and finish a PHP block of
code?
The two most common ways to start and finish a PHP script are: and
9) How can we display the output directly to the browser?
To be able to display the output directly to the browser, we have to use the special tags .
10) What is the main difference between PHP 4 and PHP 5?
PHP 5 presents many additional OOP (Object Oriented Programming) features.
11) Is multiple inheritance supported in PHP?
PHP includes only single inheritance, it means that a class can be extended from only one
single class using the keyword 'extended'.
12) What is the meaning of a final class and a final method?
'final' is introduced in PHP5. Final class means that this class cannot be extended and a final
method cannot be overrided.
13) How comparison of objects is done in PHP5?
We use the operator '==' to test is two object are instanced from the same class and have same
attributes and equal values. We can test if two object are refering to the same instance of the
same class by the use of the identity operator '==='.
14) How can PHP and HTML interact?
It is possible to generate HTML through PHP scripts, and it is possible to pass informations from
HTML to PHP.
15) What type of operation is needed when passing values through a form or an URL?
If we would like to pass values througn a form or an URL then we need to encode and to
decode them using htmlspecialchars() and urlencode().
16) How can PHP and Javascript interact?
PHP and Javascript cannot directly interacts since PHP is a server side language and
Javascript is a client side language. However we can exchange variables since PHP is able to
generate Javascript code to be executed by the browser and it is possible to pass specific
variables back to PHP via the URL.
17) What is needed to be able to use image function?
GD library is needed to be able execute image functions.
18) What is the use of the function 'imagetypes()'?
imagetypes() gives the image format and types supported by the current version of GD-PHP.
19) What are the functions to be used to get the image's properties (size, width and
height)?
The functions are getimagesize() for size, imagesx() for width and imagesy() for height.
20) How failures in execution are handled with include() and require() functions?
If the function require() cannot access to the file then it ends with a fatal error. However, the
include() function gives a warning and the PHP script continues to execute.
21) What is the main difference between require() and require_once()?
require() and require_once() perform the same task except that the second function checks if
the PHP script is already included or not before executing it.
(same for include_once() and include())
22) How can I display text with a PHP script?
Two methods are possible:
[crayon-55b9e4c229da1933798330/]
23) How can we display information of a variable and readable by human with PHP?
To be able to display a human-readable result we use print_r().
24) How is it possible to set an infinite execution time for PHP script?
The set_time_limit(0) added at the beginning of a script sets to infinite the time of execution to
not have the PHP error 'maximum execution time exceeded'.It is also possible to specify this in
the php.ini file.
25) What does the PHP error 'Parse error in PHP - unexpected T_variable at line x'
means?
This is a PHP syntax error expressing that a mistake at the line x stops parsing and executing
the program.