The word variable is derived from the root word “vary”, meaning, changing in amount, volume, number, form, nature or type. These variables should be measurable, i.e., they can be counted or subjected to a scale. In other words, a Variable is a measurable characteristic that varies.

variable. noun. English Language Learners Definition of variable (Entry 2 of 2) : something that changes or that can be changed : something that varies. mathematics : a quantity that can have any one of a set of values or a symbol that represents such a quantity.

varify. (transitive) To make different; to vary or variegate.

A Dictionary variable is a variable that contains a group of name-value pairs. For example, you might need to save a name, address, and start date of an employee in a variable. These are all different data types and using a dictionary variable allows you to store all these in a single variable.

Variable, In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation. Commonly used variables include x and y (real-number unknowns), z (complex-number unknowns), t (time), r (radius), and s (arc length).

In programming, a variable is a value that can change, depending on conditions or on information passed to the program. Usually, both constants and variables are defined as certain data type s.

To declare (create) a variable, you will specify the type, leave at least one space, then the name for the variable and end the line with a semicolon ( ; ). Java uses the keyword int for integer, double for a floating point number (a double precision number), and boolean for a Boolean value (true or false).

Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves.

PHP Variables

• A variable starts with the $ sign, followed by the name of the variable.
• A variable name must start with a letter or the underscore character.
• A variable name cannot start with a number.
• A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )

PHP originally stood for Personal Home Page, but it now stands for the recursive initialism PHP: Hypertext Preprocessor. PHP code is usually processed on a web server by a PHP interpreter implemented as a module, a daemon or as a Common Gateway Interface (CGI) executable.

In PHP, a variable is declared using $ sign followed by variable name. The main way to store information in the middle of a PHP program is by using a variable.

Variables are used to store data, like string of text, numbers, etc. Variable values can change over the course of a script. In PHP, a variable does not need to be declared before adding a value to it. PHP automatically converts the variable to the correct data type, depending on its value.

PHP has many types of variables, but the most basic variable types are integer (whole numbers), float (real numbers), strings, and booleans. PHP also has arrays and objects which we will explain in other tutorials. Variables can also be set to NULL, which means that the variables exist, but do not contain any value.

Scope of a variable is defined as its extent in program within which it can be accessed, i.e. the scope of a variable is the portion of the program within which it is visible or can be accessed.

A data type, in programming, is a classification that specifies which type of value a variable has and what type of mathematical, relational or logical operations can be applied to it without causing an error.

A data structure is a collection of data type ‘values’ which are stored and organized in such a way that it allows for efficient access and modification. When we think of data structures, there are generally four forms: Linear: arrays, lists. Tree: binary, heaps, space partitioning etc.

Data Structure can be defined as the group of data elements which provides an efficient way of storing and organising data in the computer so that it can be used efficiently. Some examples of Data Structures are arrays, Linked List, Stack, Queue, etc.

In computer science, a data structure is a data organization, management, and storage format that enables efficient access and modification. More precisely, a data structure is a collection of data values, the relationships among them, and the functions or operations that can be applied to the data.

A data structure is a collection of different forms and different types of data that has a set of specific operations that can be performed. It is a collection of data types. It is a way of organizing the items in terms of memory, and also the way of accessing each item through some defined logic.