What is the function mysql_pconnect() useful for?
mysql_pconnect() ensure a persistent connection to the database, it means that the connection does not close when the PHP script ends. This function is not supported in PHP 7.0 and above
How can we connect to a MySQL database from a PHP script?
To connect to a MySQL database, we must use mysqli_connect() function as follows: <!--?php $database = mysqli_connect("HOST", "USER_NAME", "PASSWORD"); mysqli_select_db($database,"DATABASE_NAME"); ?-->
What is the function file_get_contents() useful for?
file_get_contents() lets reading a file and storing it in a string variable.
What should we do to be able to export data into an Excel file?
The most common and used way is to get data into a format supported by Excel. For example, it is possible to write a .csv file, to choose for example…
What does the PHP error ‘Parse error in PHP – unexpected T_variable at line x’ means?
This is a PHP syntax error expressing that a mistake at the line x stops parsing and executing the program.
How is it possible to set an infinite execution time for PHP script?
The set_time_limit(0) added at the beginning of a script sets to infinite the time of execution to not have the PHP error ‘maximum execution time exceeded.’ It is also possible…
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.