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Php Interview Questions and Answers
How do you define a constant?
Via define() directive, like define ("MYCONSTANT", 100);
What are the differences between require and include, include_once?
Anwser 1:
require_once() and include_once() are both the functions to include and
evaluate the specified file only once. If the specified file is included
previous to the present call occurrence, it will not be done again.
But require() and include() will do it as many times they are asked to
do.
Anwser 2:
The include_once() statement includes and evaluates the specified file
during the execution of the script. This is a behavior similar to the
include() statement, with the only difference being that if the code
from a file has already been included, it will not be included again.
The major difference between include() and require() is that in failure
include() produces a warning message whereas require() produces a fatal
errors.
Anwser 3:
All three are used to an include file into the current page.
If the file is not present, require(), calls a fatal error, while in
include() does not.
The include_once() statement includes and evaluates the specified file
during the execution of the script. This is a behavior similar to the
include() statement, with the only difference being that if the code
from a file has already been included, it will not be included again. It
des not call a fatal error if file not exists. require_once() does the
same as include_once(), but it calls a fatal error if file not exists.
Anwser 4:
File will not be included more than once. If we want to include a file
once only and further calling of the file will be ignored then we have
to use the PHP function include_once(). This will prevent problems with
function redefinitions, variable value reassignments, etc.
What is meant by urlencode and urldecode?
Anwser 1:
urlencode() returns the URL encoded version of the given string. URL
coding converts special characters into % signs followed by two hex
digits. For example: urlencode("10.00%") will return "10%2E00%25". URL
encoded strings are safe to be used as part of URLs.
urldecode() returns the URL decoded version of the given string.
Anwser 2:
string urlencode(str) - Returns the URL encoded version of the input
string. String values to be used in URL query string need to be URL
encoded. In the URL encoded version:
Alphanumeric characters are maintained as is.
Space characters are converted to "+" characters.
Other non-alphanumeric characters are converted "%" followed by two hex
digits representing the converted character.
string urldecode(str) - Returns the original string of the input URL
encoded string.
For example:
$discount ="10.00%";
$url = "http://domain.com/submit.php?disc=".urlencode($discount);
echo $url;
You will get "http://domain.com/submit.php?disc=10%2E00%25".
How To Get the Uploaded File Information in the Receiving Script?
Once the Web server received the uploaded file, it will call the PHP
script specified in the form action attribute to process them. This
receiving PHP script can get the uploaded file information through the
predefined array called $_FILES. Uploaded file information is organized
in $_FILES as a two-dimensional array as:
$_FILES[$fieldName]['name'] - The Original file name on the browser
system.
$_FILES[$fieldName]['type'] - The file type determined by the browser.
$_FILES[$fieldName]['size'] - The Number of bytes of the file content.
$_FILES[$fieldName]['tmp_name'] - The temporary filename of the file in
which the uploaded file was stored on the server.
$_FILES[$fieldName]['error'] - The error code associated with this file
upload.
The $fieldName is the name used in the <INPUT TYPE=FILE, NAME=fieldName>.
What is the difference between mysql_fetch_object and mysql_fetch_array?
MySQL fetch object will collect first single matching record where
mysql_fetch_array will collect all matching records from the table in an
array
How can I execute a PHP script using command line?
Just run the PHP CLI (Command Line Interface) program and provide the
PHP script file name as the command line argument. For example, "php
myScript.php", assuming "php" is the command to invoke the CLI program.
Be aware that if your PHP script was written for the Web CGI interface,
it may not execute properly in command line environment.
I am trying to assign a variable the value of 0123, but it keeps coming
up with a different number, what’s the problem?
PHP Interpreter treats numbers beginning with 0 as octal. Look at the
similar PHP interview questions for more numeric problems.
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