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Php Interview Questions and Answers
Why doesn’t the following code print the
newline properly? <?php $str = ‘Hello, there.\nHow are you?\nThanks for
visiting techpreparation’; print $str; ?>
Because inside the single quotes the \n character is not interpreted as
newline, just as a sequence of two characters - \ and n.
Would you initialize your strings with single quotes or double quotes?
Since the data inside the single-quoted string is not parsed for
variable substitution, it’s always a better idea speed-wise to
initialize a string with single quotes, unless you specifically need
variable substitution.
How can we extract string 'abc.com ' from a string http://info@abc.com
using regular expression of php?
We can use the preg_match() function with "/.*@(.*)$/" as
the regular expression pattern. For example:
preg_match("/.*@(.*)$/","http://info@abc.com",$data);
echo $data[1];
What are the differences between GET and POST methods in form
submitting, give the case where we can use GET and we can use POST
methods?
Anwser 1:
When we submit a form, which has the GET method it displays pair of
name/value used in the form at the address bar of the browser preceded
by url. Post method doesn't display these values.
Anwser 2:
When you want to send short or small data, not containing ASCII
characters, then you can use GET” Method. But for long data sending, say
more then 100 character you can use POST method.
Once most important difference is when you are sending the form with GET
method. You can see the output which you are sending in the address bar.
Whereas if you send the form with POST” method then user can not see
that information.
Anwser 3:
What are "GET" and "POST"?
GET and POST are methods used to send data to the server: With the GET
method, the browser appends the data onto the URL. With the Post method,
the data is sent as "standard input."
Major Difference
In simple words, in POST method data is sent by standard input (nothing
shown in URL when posting while in GET method data is sent through query
string.
Ex: Assume we are logging in with username and password.
GET: we are submitting a form to login.php, when we do submit or similar
action, values are sent through visible query string (notice ./login.php?username=...&password=...
as URL when executing the script login.php) and is retrieved by
login.php by $_GET['username'] and $_GET['password'].
POST: we are submitting a form to login.php, when we do submit or
similar action, values are sent through invisible standard input (notice
./login.php) and is retrieved by login.php by $_POST['username'] and $_POST['password'].
POST is assumed more secure and we can send lot more data than that of
GET method is limited (they say Internet Explorer can take care of
maximum 2083 character as a query string).
Anwser 4:
In the get method the data made available to the action page ( where
data is received ) by the URL so data can be seen in the address bar.
Not advisable if you are sending login info like password etc. In the
post method the data will be available as data blocks and not as query
string in case of get method.
Anwser 5:
When we submit a form, which has the GET method it pass value in the
form of query string (set of name/value pair) and display along with
URL. With GET we can a small data submit from the form (a set of 255
character) whereas Post method doesn't display value with URL. It passes
value in the form of Object and we can submit large data from the form.
Anwser 6:
On the server side, the main difference between GET and POST is where
the submitted is stored. The $_GET array stores data submitted by the
GET method. The $_POST array stores data submitted by the POST method.
On the browser side, the difference is that data submitted by the GET
method will be displayed in the browser’s address field. Data submitted
by the POST method will not be displayed anywhere on the browser.
GET method is mostly used for submitting a small amount and less
sensitive data. POST method is mostly used for submitting a large amount
or sensitive data.
What is the difference between the functions unlink and unset?
unlink() is a function for file system handling. It will simply delete
the file in context.
unset() is a function for variable management. It will make a variable
undefined.
How come the code works, but doesn’t for two-dimensional array of mine?
Any time you have an array with more than one dimension, complex parsing
syntax is required. print "Contents: {$arr[1][2]}" would’ve worked.
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