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Unlike function and class names, variable names are case-sensitive. Both double-quoted ("") and heredoc strings provide the ability to interpolate a variable's value into the string.[10] PHP treats newlines as whitespace in the manner of a free-form language, and statements are terminated by a semicolon.[11] PHP has three types of comment syntax: /* */ marks block and inline comments; // or # are used for one-line comments.[12] The echo statement is one of several facilities PHP provides to output text.[citation needed]