Description:
------------
some example code is wrong of  "String" in  Chinese Doc 

link:
http://php.net/manual/zh/language.types.string.php


也可以在字符串中用此语法通过变量来调用类的属性。

<?php
class foo {
    var $bar = 'I am bar.';
}

$foo = new foo();
$bar = 'bar';
$baz = array('foo', 'bar', 'baz', 'quux');
echo "{$foo->$bar}\n";
echo "{$foo->$baz[1]}\n";
?>
以上例程会输出：


I am bar.
I am bar.


The line before "?>" should be "echo "{$foo->{$baz[1]}}\n";"
{} is missing in Chinese document.There will be an error.
Please check it.

Expected result:
----------------
"echo "{$foo->$baz[1]}\n" " should be "echo "{$foo->{$baz[1]}}\n";"