Maison > Article > développement back-end > php 中英字符串截取,支持utf8 跟gbk
php 中英字符串截取,支持utf8 和gbk
?
今天在遇到了一个中英字符串截取的问题,在gbk里中文里每个字占两字节,如果全是中文的话,用substr()函数就可以实现了,但中英都有的话就麻烦了,在以前收藏的代码里找到了一个不错的函数,很好的实现了截取的功能
?
function get_word($string, $length, $dot = '..',$charset='gbk') { if(strlen($string) <= $length) { return $string; } $string = str_replace(array(' ',' ', '&', '"', '<', '>'), array('','','&', '"', '<', '>'), $string); $strcut = ''; if(strtolower($charset) == 'utf-8') { $n = $tn = $noc = 0; while($n < strlen($string)) { $t = ord($string[$n]); if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) { $tn = 1; $n++; $noc++; } elseif(194 <= $t && $t <= 223) { $tn = 2; $n += 2; $noc += 2; } elseif(224 <= $t && $t < 239) { $tn = 3; $n += 3; $noc += 2; } elseif(240 <= $t && $t <= 247) { $tn = 4; $n += 4; $noc += 2; } elseif(248 <= $t && $t <= 251) { $tn = 5; $n += 5; $noc += 2; } elseif($t == 252 || $t == 253) { $tn = 6; $n += 6; $noc += 2; } else { $n++; } if($noc >= $length) { break; } } if($noc > $length) { $n -= $tn; } $strcut = substr($string, 0, $n); } else { for($i = 0; $i < $length; $i++) { $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i]; } } return $strcut.$dot; }?