PHP Developer Questions & Answers
Q) What
is PHP?
ANS:PHP is a server side scripting
language commonly used for web applications
Q) How
to include a file to a php page?
ANS: we can include a file using
"include() " or "require()" function with as its parameter.
Q) What
Is a Session?
ANS: It can be used to store
information on the server for future use
Q) What
are the correct and the most two common way to start and finish a PHP block of
code?
ANS: The two most common ways to
start and finish a PHP script are: <?php [ --- PHP code----
] ?> and <? [--- PHP code ---] ?>
Q) How
can PHP and HTML interact?
ANS: It is possible to generate HTML
through PHP scripts, and it is possible to pass informations from HTML to PHP.
Q) How
can I display text with a PHP script?
ANS: Two methods are possible:
1
2
3
4
|
<?php
echo "Method
1";
print "Method
2";
?>
|
Q) How
can we connect to a MySQL database from a PHP script?
ANS: To be able to connect to a MySQL
database, we must use mysql_connect() function as follows:
1
2
3
4
|
<?php
$database =
mysql_connect("HOST", "USER_NAME", "PASSWORD");
mysql_select_db("DATABASE_NAME",$database);
?>
|
Q) How can I display text with a PHP script?
ANS: Two methods are possible:
1
2
3
4
|
<?php
echo "Method 1";
print "Method 2";
?>
|
Q) What does the PHP error ‘Parse error in
PHP – unexpected T_variable at line x’ means?
ANS: This is a PHP syntax error expressing
that a mistake at the line x stops parsing and executing the program.
Q) what is
the static variable in function useful for?
A static variable is defined within a
function only the first time and its value can be modified during function
calls as follows:
1
2
3
4
5
6
7
8
9
|
<?php
function testFunction() { static $testVariable = 1;
echo $testVariable;
$testVariable++;
}
testFunction();
//1
testFunction();
//2
testFunction();
//3
?>
|
Q) How is it possible to cast types in PHP?
ANS: The name of the output type have to be
specified in parentheses before the variable which is to be cast as follows:
* (int), (integer) – cast to integer
* (bool), (boolean) – cast to boolean
* (float), (double), (real) – cast to float
* (string) – cast to string
* (array) – cast to array
* (object) – cast to object
