PHP Interview Questions
How can we check the value of a given variable is alphanumeric?
It is possible to use the dedicated function, ctype_alnum to check whether it is an alphanumeric value or not.
How do I check if a given variable is empty?
empty() function is used to check whether a variable has a value or not i.e. it is empty or not
What does the unlink() function mean?
The unlink() function is dedicated for file system handling. It simply deletes the specified file.
What does the unset() function mean?
The unset() function is dedicated for variable management. It will make a variable undefined.
Is it possible to remove the HTML tags from data?
The strip_tags() function enables us to clean a string from the HTML tags.
What does accessing a class via :: (double colon) means?
:: is used to access static methods that do not require object initialization.
What is the meaning of a Persistent Cookie?
A persistent cookie is permanently stored in a cookie file on the browser’s computer. By default, cookies are temporary and are erased if we close the browser.
What does $GLOBALS mean?
$GLOBALS is associative array including references to all variables which are currently defined in the global scope of the script.
What does $_SERVER mean?
$_SERVER is an array including information created by the web server such as paths, headers, and script locations. The entries in this array are created by the web server. There is no guarantee that every web server will provide any of these; servers may omit some, or provide others not listed here.
What does $_FILES mean?
$_FILES is an associative array composed of items sent to the current script via the HTTP POST method.