PHP Interview Questions
Questions Answers Views Company eMail

What is the functionality of the function html entities?

3 6752

How can we get second of the current time using date function?


2 14186

How can we convert the time zones using PHP?

1 9521

What is meant by urlencode and urldocode?

2 6847

What is the difference between the functions unlink and unset?

TCS, Small Firm,

8 13790

How can we register the variables into a session?

1 4249

How can we get the properties (size, type, width, height) of an image using PHP image functions?


4 14970

How can we get the browser properties using PHP?

7 26326

What is the maximum size of a file that can be uploaded using PHP and how can we change this?

4 12222

How can we increase the execution time of a PHP script?

Photon, CyberBeoz, XTX,

12 27072

How can we take a backup of a mysql table and how can we restore it. ?

Brain Infosys, Oracle,

7 12928

How can we optimize or increase the speed of a mysql select query?

6 12440

How many ways can we get the value of current session id?

Infosys, L&T, SysBiz, Torque Infotech,

3 16819

How can we destroy the session, how can we unset the variable of a session?

5 9033

How can we destroy the cookie?

4 13101

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Un-Answered Questions { PHP }

what are the differences between php and perl


i m a B.E,passed out few yrs bak failed to find good job due to less marks now thinkin of a career as PHP developer. is it a lucarative field and wat r career prospects; hv heard dat initial salary is very less bout 6k also most jobs r contrct jobs.pls guide me need ur valuable advice.pls hellppp!! thnx..


what is mean by portal


what is the current salary package in India for a PHP programmer who has 1.5 years experience


what is difference between PHP4 , PHP5


sort term descripttion form, report and uery


How could I install codeignitor ?


discuss the issue of software theft in ghana and how it has affected the economy


is that "enumerated array" equal to "numeric array"?


what is benefit of magento?


what is constructor


How to get best php developer Experience in Php with Sugar CRM / VTiger.


how to open & closing opening period in fico


4 down vote favorite share [g+] share [fb] share [tw] I am developing my site using server side sessions using redis as backend for saving the session. Now the issue which is bothering me is of user leaving the website without logging out. I mean user simply closes the browser which causes the cookie to be deleted. Now session of that user still exists on the server and will not be used again as new login requires creating a new session due to security reasons. To avoid the case where hacker steals the old cookie and use it after user login again with same old session id. In essence user leaves the website without explicitly logging out and his session will be deleted after certain time limit of inaccessibility. I am thinking time limit of 30-60 minutes. Also with every new request from user his cookie will also be updated to keep track of when the user last time accessed the site. But nowadays, people let site remain open for long time without accessing it. For example users open facebook and gmail in new tabs and forget about them for 2-3 hours and still they are not asked to login again. Is letting a 2-3 hours old cooke access the session secure? My concern is someone steals user cookie and use it 2-3 hours later. Thinking on this topic has also forced me to question how facebook manages security if user can use a session where they are not accessing it for long periods of time and still they remain logged in. Or is it not secure for me to keep logged in when am not accessing the site session for longer period of time? It can be the case also there is some pinging mechanism using which sites keep track of user having their site open in a browser and when browser closes they are notified and can work accordingly. My website is a social network and needs all those security and usage features which a social network may need. I am new to web security and web development in general and may be the case where my above questions may seem a little basic. If you feel that is the case kindly point to some good reference where I can read and find answers to my question.


What is polymorphism?