php按照指定长度截取字符串的代码

php按照指定长度截取字符串的代码，如果字符串超出了指定的长度，会用...替换，不过这段代码不支持中英文的区分

1. //if a string is longer than the defined length,
2. //it will add 3 periods to the end of the string.
3. //you can change it to what ever you want for example:
4. //return substr($str,0,$len).'[Read More]';
5. //http://www.sharejs.com
6. function strLength($str,$len){
7. $lenght = strlen($str);
8. if($lenght > $len){
9. return substr($str,0,$len).'...';
10. }else{
11. return $str;
12. }
13. }
14. $str = "This is a fairly long string.";
15. //The fist part is the string, the second part is how long it can be
16. echo strLength($str,10).'
    ';
17. echo strLength($str,30);
18. ?>