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http://www.nowamagic.net/php/php_SubMixedString.php
http://waiting.iteye.com/blog/581888
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; } $str = "欢迎 visit 简明 nowamagic"; $str_result = get_word($str, 12); echo $str_result;
/** * 截取UTF8编码字符串从首字节开始指定宽度(非长度), 适用于字符串长度有限的如新闻标题的等宽度截取 * 中英文混排情况较理想. 全中文与全英文截取后对比显示宽度差异最大,且截取宽度远大越明显. * @param string $str UTF-8 encoding * @param int[option] $width 截取宽度 * @param string[option] $end 被截取后追加的尾字符 * @param float[option] $x3<p> * 3字节(中文)字符相当于希腊字母宽度的系数coefficient(小数) * 中文通常固定用宋体,根据ascii字符字体宽度设定,不同浏览器可能会有不同显示效果</p> * * @return string * @author waiting * http://waiting.iteye.com */ function u8_title_substr($str, $width = 0, $end = ‘...‘, $x3 = 0) { global $CFG; // 全局变量保存 x3 的值 if ($width <= 0 || $width >= strlen($str)) { return $str; } $arr = str_split($str); $len = count($arr); $w = 0; $width *= 10; // 不同字节编码字符宽度系数 $x1 = 11; // ASCII $x2 = 16; $x3 = $x3===0 ? ( $CFG[‘cf3‘] > 0 ? $CFG[‘cf3‘]*10 : $x3 = 21 ) : $x3*10; $x4 = $x3; // http://zh.wikipedia.org/zh-cn/UTF8 for ($i = 0; $i < $len; $i++) { if ($w >= $width) { $e = $end; break; } $c = ord($arr[$i]); if ($c <= 127) { $w += $x1; } elseif ($c >= 192 && $c <= 223) { // 2字节头 $w += $x2; $i += 1; } elseif ($c >= 224 && $c <= 239) { // 3字节头 $w += $x3; $i += 2; } elseif ($c >= 240 && $c <= 247) { // 4字节头 $w += $x4; $i += 3; } } return implode(‘‘, array_slice($arr, 0, $i) ). $e; }
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原文地址:http://my.oschina.net/bobchow/blog/408733