PHP Questions and Answers

CRYPT()
MD5()

To know the image size use getimagesize() function
To know the image width use imagesx() function
To know the image height use imagesy() function

By the use of void set_time_limit(int seconds)

Set the number of seconds a script is allowed to run. If this is reached, the script returns a fatal error. The default limit is 30 seconds or, if it exists, the max_execution_time value defined in the php.ini. If seconds is set to zero, no time limit is imposed.

When called, set_time_limit() restarts the timeout counter from zero. In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.

setcookie(‘variable’,’value’,’time’);

variable – name of the cookie variable
value – value of the cookie variable
time – expiry time
Example: setcookie(‘Test’,$i,time()+3600);

Test – cookie variable name
$i – value of the variable ‘Test’
time()+3600 – denotes that the cookie will expire after an one hour

Reset a cookie by specifying expire time in the past:
Example: setcookie(‘Test’,$i,time()-3600); // already expired time

Reset a cookie by specifying its name only
Example: setcookie(‘Test’);

Using imagetypes() function to find out what types of images are supported in your PHP engine.
imagetypes() -Returns the image types supported by the current PHP installation.
This function returns a bit-field corresponding to the image formats supported by the version of GD linked into PHP. The following bits are returned, IMG_GIF | IMG_JPG | IMG_PNG | IMG_WBMP | IMG_XPM.

session_id() returns the session id for the current session.

All of those are open source resource. Security of  Linux is very more than windows. Apache is a better server that IIS both in functionality and security. Mysql is world most popular open source database. Php is more faster that asp or any other scripting language.

One of the main advantages of OO programming is its easy of modification; objects can easily be modified and added to a system there by reducing maintenance costs. OO programming is also considered to be better at modeling the real world than is procedural programming. It allows for more complicated and flexible interactions. OO systems are also easier for non-technical personnel to understand and easier for them to participate in the maintenance and enhancement of a system because it appeals to natural human cognition patterns. For some systems, an OO approach can speed development time since many objects are standard across systems and can be reused. Components that manage dates, shipping, shopping carts, etc. can be purchased and easily modified for a specific system.

$second = date(“s”);