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, ' ');