Sams Teach Yourself PHP in 10 Minutes

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# (use in single-line comments) 2nd 3rd

#! (hash bang character)     shell script$_SERVER super-global array     web server environmental information         scripts 2nd

         servers 2nd

         users 2nd

% (modulus operator) 2nd' (backticks)

     host program execution 2nd (statement terminator) * (multiplication operator)

+ (addition operator)

++ (increment operator) 2nd

- (subtraction operator)

-- (decrement operator) 2nd / (division operator)

/*É*/ (use in multiple-line comments) 2nd 3rd

// (use in single-line comments) 2nd 3rd ?php tag 2nd 3rd