jsj_php基本语法.pdf

php PHP PHP PHP: Hypertext Preprocessor” HTML WEB 1-1. ?php echo Hi, Im a PHP script!; ? php PHP ?php … ? ? … ? % … % php.ini ?php echo “ echo “ccopen; ? php Hello.php ?php echo “ echo “ccopen; ? apache htmljavascriptcss php phphtml apache*.htm *.htmlphp .htm.html php Code:code a/hello.php ? php PHP ‘C’‘C++’ Unix Shell // /* */ # Unix [ ] : ?php echo “This is a test”; // c++ /* This is a multi line comment yet another line of comment */ echo “This is yet another test”; echo “One Final Test”; # unix shell ? ? ? ? ? C PHP isset() unset @ PHP PHP ?php $var = Bob; $Var = Joe; echo $var, $Var; // outputs Bob, Joe $4site = not yet; // invalid; starts with a number $_4site = not yet; // valid; starts with an underscore $t?yte = mansikka; // invalid; ? Code:code a/liang.php @ PHP $GLOBALS PHP 3 $GLOBALS $_SERVER Web $HTTP_SERVER_VARS $_GET HTTP GET $HTTP_GET_VARS $_POST HTTP POST $HTTP_POST_VARS $_COOKIE HTTP Cookies $HTTP_COOKIE_VARS $_FILES HTTP POST $HTTP_POST_FILES POST $_ENV $HTTP_ENV_VARS $_REQUEST GET POST COOKIE @ PHP REQUEST_METHOD getpost QUERY_STRING DOCUMENT_ROOT $_SERVER[QUERY_STRING] @ ?php $a = 1; /* */ //1 //2 global function Test() { echo $a; /* $a */ } Test(); ? global ?php $a = 1; $b = 2; function Sum() { global $a, $b //global $b = $a + $b; } Sum(); echo $b; ? 3 ? php function Sum() { global $b; $b=200; } Sum(); echo $b; ? 200; @$GLOBALS $GLOBALS global ?php $a = 1; $b = 2; function Sum() { $GLOBALS[b] = $GLOBALS[a] + $GLOBALS[b]; } Sum(); echo $b; ?