Question: How does using single versus double quotation marks differ in creating or printing strings? What does it mean to escape a character in a string?

How does using single versus double quotation marks differ in creating or printing strings? What does it mean to escape a character in a string? What are the three comment syntaxes in PHP? Which one can be used over multiple lines? What character do all variable names begin with? What characters can come next? What other characters can be used in a variables name?

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