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mb_substr($word,strpos($word,$key_word)/3,100,'utf-8');
$start_key = mb_strpos($word,$key_word);
$start_key = $start_key>0?$start_key:0;
mb_substr($word,$start_key,100,'utf-8');
//字符串截取,所有字符长度都是1,gbk、utf-8通用。
function cut($str, $len = 12, $dot = '...') {
if (mb_strlen($str, "utf-8") <= ($len + 1)) {
$str = $str;
} else {
$str = mb_substr($str, 0, $len, "utf-8") . $dot;
}
return $str;
}