Entry Level PHP Web Application Development/Our First Programs: Hello, World!/SQS-Answer

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A single-quoted string (also known as a single quoted string literal, because it is a value that means exactly what it looks like) has the purpose of including a string verbatim into a program. Single-quoted strings are not inspected by the PHP interpreter for variables to perform substitution in; for example, the string '$foo on you' will appear as $foo on you when output to the user’s web browser.