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problem with short code

Shortcodes are broken.

对于那些在家踢球的人，这里有一个简单的步骤来复制我的问题。

打开新的Wordpress安装（3.4.2）。

2） 进入二十一/功能。php并添加以下内容：

function test() {
echo \'-TEST-\';
}
add_shortcode(\'testshortcode\', \'test\');

3）编辑“hello world”帖子，说：

Welcome to WordPress. This is your first post. Edit or delete it, then start blogging! 
[testshortcode] 
foobar

4）保存并查看，我的结果如下所示：

-TEST-
Welcome to WordPress. This is your first post. Edit or delete it, then start blogging!
foobar

当它看起来像这样时：

Welcome to WordPress. This is your first post. Edit or delete it, then start blogging!
-TEST-
foobar

What on earth is going on here?

function test() {
    return \'-TEST-\';
}
add_shortcode( \'testshortcode\', \'test\' );

function test() {
    ob_start();
    echo \'-TEST-\';
    return ob_get_contents();
}
add_shortcode( \'testshortcode\', \'test\' );