[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] [Z] <=> (NULL-safe equality comparison operator) <base> element (HTML) <pre> tags \ (backslash) in regular expressions {} (braces) (regular expressions) [] (brackets) client side scripts and in regular expressions . (dot operator) == (double-equal operator) $ (end anchor) (regular expressions) => (equal-to or greater-than operator) == (equality operator) string comparisons and /* and */ (multi-line comments) // (one-line comments) # (one-line comments) === (is-identical operator) !== (is-not-identical operator)) * (matching operator) (regular expressions) + (matching operator) (regular expressions) ? (matching operator) (regular expressions) % (modulo function) != (not equals operator) ^ (not operator) (regular expressions) <?php and ?> script tags ^ (start anchor) (regular expressions) 4/5 rounding rules |