Set - 7

Question 1 :

What are encryption functions in PHP?

Answer :


Question 2 :

What is the difference between htmlentities() and htmlspecialchars()? 

Answer :

htmlspecialchars() - Convert some special characters to HTML entities (Only the most widely used)
htmlentities() - Convert ALL special characters to HTML entities

Question 3 :

What is the functionality of the function htmlentities? 

Answer :

htmlentities() - Convert all applicable characters to HTML entities
This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities.

Question 4 :

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

Answer :

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

Question 5 :

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

Answer :

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.