... forms.VariablesVariables are a concept found in virtually allprogramming languages. They are used tostore a value, which can be retrieved, usedand changed later on.You might be familiar with a ... Javascript,where variables are declared with the ‘var’keyword.var x = 10;In PHP, however, variables are declared with a dollar symbol.$x = 10;PHP variables cannot start with a number or a special character ... with a language thatrequires you to specify the value of a variable.These include C#, C, C++ and Java, andusually look a bit like this.int x = 10;You also might be familiar with Javascript,where...