PHP在字符断点处截断文字的实现代码

//所谓断字 (word break)，即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。
// please acknowledge use of this code by including this header.
function mytruncate($string, $limit, $break=".", $pad="...") {
// return with no change if string is shorter than $limit
if(strlen($string) <= $limit)
return $string;
// is $break present between $limit and the end of the string?
if(false !== ($breakpoint = strpos($string, $break, $limit))) {
if($breakpoint < strlen($string) - 1) {
$string = substr($string, 0, $breakpoint) . $pad;
}
}
return $string;
}
/***** example ****/
$short_string=mytruncate($long_string, 100, ' ');