In everyday conversation, we use the word data to refer to any sort of informati…

We use quotation marks to indicate the start and end of a string. The quotation marks tell the computer that we want everything inside them to be treated as a single piece of data. But how do we in…

It can be useful to combine two strings together. This process is called string concatenation, and we can use the concatenation operator ( […] ) to do this. An operator is a character that …

Let’s say I have a really long string in my program, and I’m going to need to use it multiple times. Do I have to type the string out every time I need to use it? The answer is “no”. Variables are …

Let’s look at an example of creating a variable: […] In the code above, we’re actually doing two things with a single statement: we’re declaring a new variable by giving it the name […] ….

Once we’ve declared a variable and assigned a value to it, we can use it as many times as we want. We refer to a variable by using the dollar sign followed by the variable’s name. […] Except…

In the last exercise, we saw how concatenating a number of strings and string variables got annoying. There’s an easier way! PHP strings allow us to place variables directly into double quoted st…

The word variable comes from the latin variāre which means “to make changeable.” This is an apt name because the value assigned to a variable can change. ![gif of reassignment](https://s3.amazona…

We can assign and reassign variables to the values that result from operations: […] During assignment, the computer will first evaluate everything to the right of the assignment operator and r…

When we create a variable assigned to another variable, the computer finds a new space in memory which it associates with the left operand, and it stores a copy of the right operand’s value there. …

Awesome work! We’ve covered a lot of material in this lesson, so let’s review: - Strings are collections of text that the computer treats as a single piece of data. - A string can be any length an…