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] [Z] [See also $ENV array] !== (nonidentity) operator " (double quotes) escaping escaping in database queries $ (dollar sign) escaping $_COOKIE array 2nd global variable injection $_ENV array $_FILES array 2nd $_GET array global variable injection, preventing required fields and REST methods, serving REST requests and $_POST array global variable injection, preventing required fields and verifying data with hashes $_REQUEST array $_SERVER array 2nd 3rd 4th detecting SSL REST methods, serving SOAP authentication $_SESSION array $GLOBALS array 2nd $HTTP_COOKIE_VARS arrays $HTTP_ENV_VARS arrays $HTTP_GET_VARS arrays $HTTP_POST_FILES arrays 2nd $HTTP_POST_VARS arrays $HTTP_RAW_POST_DATA $HTTP_SERVER_VARS arrays % (percent sign) format operators and remainder operator, as a % (SQL wildcard) %i specifier %n specifier & (ampersand) interpreting GET query stings ' (single quotes) escaping in database queries ( ) (parentheses) * (asterisk) + (plus sign) GET query strings merging arrays -> (arrow) accessing methods or variables static properties and methods, defining . (dot) concatenation operator 2nd regular expression metacharacter / (forward slash) Perl m/ / pattern matching 2nd /i flag 2nd :: (double colon) accessing methods or variables ; (semicolon), using heredoc formats <<< (heredoc format) [See also heredoc format] <img> source tag [See img source tag] <option/> element <select/> element <textarea> form field = (equals) 2nd cloning objects object references, assigning =& operator 2nd object references, assigning == (equality) operator 2nd === (identity) operator 2nd ? (question mark) 2nd U pattern-modifier and ?: operator @ (at sign) in email addresses [ ] (square brackets) character classes, matching with configuration files, parsing form elements with multiple options and HTML checkbox values and \ (backslash) directories in pathnames escaping \b word-boundary metacharacter \n (newline) trimming wrapping lines and \n (newline) escape sequence \r (carriage return) trimming \s whitespace metacharacter \t (tab) \w (word character) ^ (caret) _ (SQL wildcard) _ (underscore) __autoload( ) __call( ) 2nd 3rd binding functions and __CLASS__ constant __clone method __construct( ) 2nd 3rd 4th 5th __destruct( ) __FILE__ constant 2nd using shmop_open( ) __FUNCTION__ constant __get( ) __isset( ) __LINE__ constant __METHOD__ constant __set( ) __setSoapHeaders( ) __sleep( ) __soapCall( ) 2nd 3rd 4th redefinging endpoints __toString( ) 2nd __unset( ) __wakeUp( ) 2nd _getch( ) ` (backtick) { } (curly braces) dynamic variable names and interpolating strings and | (vertical bar) |