Variable is a symbol or name that stands for a value. Variables are used for storing values such as numeric values, characters, character strings, or memory addresses so that they can be used in any part of the program.

An array in PHP is a collection of key/value pairs. This means that it maps values to keys. Array keys (or indexes) may be either an integers or a strings whereas values can be any type.

MySQL is null operator will test whether a value is NULL. If satisfied, then returns 1 otherwise returns 0.

Bitwise operators allow to operate on the bitwise representation of their arguments.

Suppose you want to calculate gross salaries of 20 different persons or take a list of maximum and minimum temperatures of a certain month or a year, the while loop is ideal to solve these types of cases.

The var_dump() function is used to displays structured information about one or more variables.

PHP, an acronym for Hypertext Preprocessor, is a widely-used open source general-purpose scripting language. do much more with PHP.

In PHP, comparison operators take simple values (numbers or strings) as arguments and evaluate to either TRUE or FALSE.

$_REQUEST is a super global variable which is widely used to collect data after submitting html forms.

We will be using XAMPP in this article, because it’s used for all four operating systems (Windows, Linux, Mac OS X and Solaris).