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In everyday conversation, we use the word data to refer to any sort of information. This information is often a list of numbers, like a company’s monthly expenses or statistics about an athlete’s performance. However, in programming, data means something very specific. It’s still information, but that information takes the form of a few specific types.

The PHP language has different ways of handling different types of data. Which actions the computer can perform and how the computer stores the data in memory will vary based on the type. In this lesson, we’ll be learning about the string data type.

Strings are words or pieces of text that the computer treats as a single item. A string is a sequence of characters. It can be any length and contain any letters, numbers, symbols, or spaces surrounded by quotation marks.

It’s important to distinguish between strings and the rest of the code in a PHP program. Every part of a program is text, but strings are the parts we intend to keep as data—not as instructions to be executed by computer. In this lesson we’re going to focus on strings wrapped in double quotation marks (if you’re curious, you can check out the official PHP documentation to see other types of PHP strings).

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