PHP conditionals are the central to the dynamic web applications. PHP conditional statements can alter the flow of the program.
In programming, data type is the name of a group of data that has a predefined common set of characteristics.
Variable is a memorable name of computer memory cell(s) that can hold a value during the execution of the program and the value may change.
Get familiar with the PHP basic syntax, the set of basic rules that define the combinations of symbols that are considered to be correctly structured programs.