Parsing inside php double quotes

echo"This works: {$arr['foo'][3]}"; echo"This works too: {$obj->values[3]->name}"; echo"This is the value of the var named $name: {${$name}}"; echo"value of the var named by the return value of getName(): {${getName()}}"; echo"value of the var named by the return value of \$object->getName(): {${$object->getName()}}";

$juices = array("apple", "orange", "koolaid1" => "purple"); echo"He drank some $juices[0] juice.".PHP_EOL; echo"He drank some $juices[koolaid1] juice.".PHP_EOL; // 有效，只有通过花括号语法才能正确解析带引号的键名 echo"This works: {$arr['key']}"; // 有效 echo"This works: {$arr[4][3]}";

echo"This is {$great}"; echo"This is ${great}"; 

$a = 'aaaa'; $c['c'] = "ccc"; $b = "i am '$a' and '$c[c]' \" 我是双引号！\""; echo$b; //i am 'aaaa' and 'ccc'" 我是双引号！"

classbeers {const softdrink = 'rootbeer'; publicstatic$ale = 'ipa'; } $rootbeer = 'A & W'; $ipa = 'Alexander Keith\'s'; // 有效，输出： I'd like an A & Wecho"I'd like an {${beers::softdrink}}\n"; // 也有效，输出： I'd like an Alexander Keith'secho"I'd like an {${beers::$ale}}\n";

// 有效 echo "This square is {$square->width}00 centimeters broad.";