How can we display information of a variable and readable by a human with PHP?
we use print_r().
What is the main difference between require() and require_once()?
require(), and require_once() perform the same task except that the second function checks if the PHP script is already included or not before executing it.
How failures in execution are handled with include() and require() functions?
If the function require() cannot access the file then it ends with a fatal error. However, the include() function gives a warning, and the PHP script continues to execute.
What are the functions to be used to get the image’s properties (size, width, and height)?
The functions are getimagesize() for size, imagesx() for width and imagesy() for height.
What is the use of the function ‘imagetypes()’?
imagetypes() gives the image format and types supported by the current version of GD-PHP.
What is needed to be able to use image function?
GD library is needed to execute image functions.
How can PHP and Javascript interact?
PHP and Javascript cannot directly interact since PHP is a server side language and Javascript is a client-side language. However, we can exchange variables since PHP can generate Javascript code…
What type of operation is needed when passing values through a form or an URL?
If we would like to pass values through a form or an URL, then we need to encode and to decode them using htmlspecialchars() and urlencode().
How can PHP and HTML interact?
It is possible to generate HTML through PHP scripts, and it is possible to pass pieces of information from HTML to PHP.
How is the comparison of objects done in PHP?
We use the operator ‘==’ to test is two objects are instanced from the same class and have same attributes and equal values. We can test if two objects are…