PHP Variable and Value Types

Variable is a representation of a particular value, such as blue or 1234.

Notice: To create a variable, we should remember these steps:

1. Thinking of a good name
2. Putting a dollar sign ($) in front of the name.
3. Using equals sign (=) after the name to assign a literal value to that variable and put the value in quotation marks.
4. Assigning the value to a variable is an instruction and should be terminated with a semicolon (;).

Eg: $username = "Hung"

Variable names can be recognized by:

• They begin with a dollar sign ($)
• can not begin with a numeric character
• can contain numbers and the underscore (_) character
• they are case sensitive.
  

There are 2 main types of variables in PHP code: scalar and array

• Scalar variables contain 1 value at a time
• Array contains a list of values or even another array.

When we assign a value to a variable, we always assign to one of the following types:

• Integer: whole number (without decimals)

Eg: 1, 99, 200,...

• Floating point numbers ("float" or "double"): number with decimals

Eg: 1.4, 3.3, 444.33

• String: text or numeric information, specified within double quotes (" ") or single quote (' ').

My practice code:



and result