如何在cakephp中截取中文字符串？

引用

truncate
    truncate(string $text, int $length=100, array $options)
    Cuts a string to the $length and adds a suffix with ‘ending’ if the text is longer than $length. If ‘exact’ is passed as false, the truncation will occur after the next word ending. If ‘html’ is passed as true, html tags will be respected and will not be cut off.

1. echo $this->Text->truncate(   
2.     'The killer crept forward and tripped on the rug.',   
3.     22,   
4.     array(   
5.         'ending' => '...',   
6.         'exact' => false   
7.     )   
8. );  

echo $this->Text->truncate(
    'The killer crept forward and tripped on the rug.',
    22,
    array(
        'ending' => '...',
        'exact' => false
    )
);