Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] # (number sign) 2nd 3rd $ (dollar sign) constants and 2nd in PHP 2nd regular expressions 2nd variables and $_COOKIE array 2nd $_COOKIE variable $_FILES array 2nd $_GET array 2nd $_POST array 2nd 3rd 4th 5th $_REQUEST array 2nd $_REQUEST variable 2nd $_SERVER array $_SESSION array 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th $_SESSION variable $GLOBALS array $REMOTE_ADDR variable 2nd % (percent sign) 2nd ' (apostrophe) 2nd 3rd ' (quotation marks) constants double errors and 2nd 3rd 4th escaping 2nd Magic Quotes 2nd 3rd 4th 5th 6th 7th 8th 9th numbers and patterns and regular expressions 2nd single vs. double 2nd 3rd 4th special characters and using 2nd variables and 2nd vs. quote marks 2nd 3rd ' (quote marks) errors and 2nd 3rd 4th escaping 2nd Magic Quotes and 2nd 3rd 4th 5th 6th 7th 8th patterns and 2nd single vs. double 2nd 3rd 4th strings and using 2nd vs. quotation marks 2nd 3rd ( ) parentheses comparative operators and errors and 2nd functions and grouping characters logical operators and patterns and precedence spaces and WHERE conditional * (asterisk) 2nd + character - (minus sign) - character . (period) 2nd 3rd ./filename syntax .= (concatenation operator) .gif extension .htaccess files .htm extension .html extension 2nd 3rd .inc extension 2nd 3rd .inc.php extension .jpeg extension .jpg extension .php extension 2nd 3rd 4th 5th .txt extension / character /* (comment symbol) 2nd 3rd /* */ characters // (comment symbol) 2nd 3rd 1NF (First Normal Form) 2nd 3rd 2NF (Second Normal Form) 2nd 3NF (Third Normal Form) 2nd ; (semicolon) 2nd 3rd 4th 5th 6th 7th <br> tags 2nd 3rd <p> tags = (assignment operator) = (equals sign) == (double equals sign) @ operator 2nd [ ] brackets 2nd 3rd 4th 5th 6th 7th \$ characters \(backslash) 2nd 3rd 4th 5th \\(double backslash) 2nd \n character 2nd ^ (caret) _ (underscore) 2nd 3rd 4th _once() extension 2nd 3rd { } curly braces 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th | (pipe) |