PHP QUESTION ANSWER BY IGNOU BEST COACHING INSTITUTE IN DELHI NIPS INSTITUTE
For IGNOUFriend & IGNOU BCA MCA Students
What’s the difference between include and require?
It’s how
they handle failures. If the file is not found by require(), it will cause a
fatal error and halt the execution of the script. If the file is not found by
include(), a warning will be issued, but execution will continue.
What is the difference
between Session and Cookie?
The main
difference between sessions and cookies is that sessions are stored on the
server, and cookies are stored on the user’s computers in the text file format.
Cookies can not hold multiple variables,But Session can hold multiple
variables.We can set expiry for a cookie,The session only remains active as
long as the browser is open.Users do not have access to the data you stored in
Session,Since it is stored in the server.Session is mainly used for
login/logout purpose while cookies using for user activity tracking
How to set cookies in PHP?
Setcookie("sample",
"ram", time()+3600);
How to Retrieve a Cookie Value?
eg : echo
$_COOKIE["user"];
How to create a session? How to set a value in session ? How to
Remove data from a session?
Create
session : session_start();
Set value into session : $_SESSION['USER_ID']=1;
Remove data from a session : unset($_SESSION['USER_ID'];
Set value into session : $_SESSION['USER_ID']=1;
Remove data from a session : unset($_SESSION['USER_ID'];
what types of loops exist in php?
for,while,do
while and foreach (NB: You should learn its usage)
How to create a mysql connection?
mysql_connect(servername,username,password);
How to select a database?
mysql_select_db($db_name);
How to execute an sql query? How to fetch its result ?
$my_qry =
mysql_query("SELECT * FROM `users` WHERE `u_id`='1'; ");
$result = mysql_fetch_array($my_qry);
echo $result['First_name'];
$result = mysql_fetch_array($my_qry);
echo $result['First_name'];
Write a program using while loop
$my_qry =
mysql_query("SELECT * FROM `users` WHERE `u_id`='1'; ");
while($result = mysql_fetch_array($my_qry))
{
echo $result['First_name'.]."<br/>";
}
while($result = mysql_fetch_array($my_qry))
{
echo $result['First_name'.]."<br/>";
}
How we
can retrieve the data in the result set of MySQL using PHP?
o 1.
mysql_fetch_row
o 2.
mysql_fetch_array
o 3.
mysql_fetch_object
·
4. mysql_fetch_assoc
What is
the use of explode() function ?
Syntax :
array explode ( string $delimiter , string $string [, int $limit ] );
This function breaks a string into an array. Each of the array elements is a substring of string formed by splitting it on boundaries formed by the string delimiter.
This function breaks a string into an array. Each of the array elements is a substring of string formed by splitting it on boundaries formed by the string delimiter.
What is the difference between explode() and split() functions?
Split
function splits string into array by regular expression. Explode splits a
string into array by string.
What is
the use of mysql_real_escape_string() function?
It is
used to escapes special characters in a string for use in an SQL statement
Write down the code for save an uploaded file in php.
if
($_FILES["file"]["error"] == 0)
{
move_uploaded_file($_FILES["file"]["tmp_name"],
"upload/" . $_FILES["file"]["name"]);
echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
}
{
move_uploaded_file($_FILES["file"]["tmp_name"],
"upload/" . $_FILES["file"]["name"]);
echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
}
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