October 12, 2018

Sreekanth B

TCS PHP Most Frequently Asked Latest Interview Questions Answers

What is the difference between characters \034 and \x34?

\034 is octal 34 and \x34 is hex 34.

How can we pass the variable through the navigation between the pages?

It is possible to pass the variables between the PHP pages using sessions, cookies or hidden form fields.

Is it possible to extend the execution time of a PHP script?

The use of the set_time_limit(int seconds) enables us to extend the execution time of a PHP script. The default limit is 30 seconds.

Is it possible to destroy a cookie?

Yes, it is possible by setting the cookie with a past expiration time.

What is the default session time in PHP?

The default session time in php is until the closing of the browser
TCS PHP Most Frequently Asked Latest Interview Questions Answers
TCS PHP Most Frequently Asked Latest Interview Questions Answers

Is it possible to use COM component in PHP?

Yes, it's possible to integrate (Distributed) Component Object Model components ((D)COM) in PHP scripts which is provided as a framework.

Explain whether it is possible to share a single instance of a Memcache between multiple PHP projects?

Yes, it is possible to share a single instance of Memcache between multiple projects. Memcache is a memory store space, and you can run memcache on one or more servers. You can also configure your client to speak to a particular set of instances. So, you can run two different Memcache processes on the same host and yet they are completely independent. Unless, if you have partitioned your data, then it becomes necessary to know from which instance to get the data from or to put into.

what the difference between the 'BITWISE AND' operator and the 'LOGICAL AND' operator?

$a and $b: TRUE if both $a and $b are TRUE.

$a & $b: Bits that are set in both $a and $b are set.

What are the two main string operators?

The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments. The second is ('.='), which appends the argument on the right to the argument on the left.

What does the array operator '===' means?

$a === $b TRUE if $a and $b have the same key/value pairs in the same order and of the same types.

What is the differences between $a != $b and $a !== $b?

!= means inequality (TRUE if $a is not equal to $b) and !== means non-identity (TRUE if $a is not identical to $b).

what is the definition of a session?

A session is a logical object enabling us to preserve temporary data across multiple PHP pages.

How to initiate a session in PHP?

The use of the function session_start() lets us activating a session.

How can you propagate a session id?

You can propagate a session id via cookies or URL parameters.

What is the meaning of a Persistent Cookie?

A persistent cookie is permanently stored in a cookie file on the browser's computer. By default, cookies are temporary and are erased if we close the browser.

When do sessions end?

Sessions automatically end when the PHP script finishes executing but can be manually ended using the session_write_close().

What is the difference between session_unregister() and session_unset()?

The session_unregister() function unregister a global variable from the current session and the session_unset() function frees all session variables.

What does $GLOBALS mean?

$GLOBALS is associative array including references to all variables which are currently defined in the global scope of the script.

What does $_SERVER mean?

$_SERVER is an array including information created by the web server such as paths, headers, and script locations.

What does $_FILES means?

$_FILES is an associative array composed of items sent to the current script via the HTTP POST method.

What is the difference between $_FILES['userfile']['name'] and $_FILES['userfile']['tmp_name']?

$_FILES['userfile']['name'] represents the original name of the file on the client machine,

$_FILES['userfile']['tmp_name'] represents the temporary filename of the file stored on the server.


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