PHP 截取字符串专题
http://www.ccvita.com/27.html1. 截取GB2312中文字符串
<?php< ?php //截取中文字符串function mysubstr($str, $start, $len) { $tmpstr = ""; $strlen = $start + $len; for($i = 0; $i < $strlen; $i++) { if(ord(substr($str, $i, 1)) > 0xa0) { $tmpstr .= substr($str, $i, 2); $i++; } else $tmpstr .= substr($str, $i, 1); } return $tmpstr;}?>
2. 截取utf8编码的多字节字符串
<?php//截取utf8字符串function utf8Substr($str, $from, $len){ return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'. '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s', '$1',$str);}?>
3. UTF-8、GB2312都支持的汉字截取函数
<?php/* Utf-8、gb2312都支持的汉字截取函数 cut_str(字符串, 截取长度, 开始长度, 编码); 编码默认为 utf-8 开始长度默认为 0 */function cut_str($string, $sublen, $start = 0, $code = 'UTF-8') { if($code == 'UTF-8') { $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"; preg_match_all($pa, $string, $t_string); if(count($t_string) - $start > $sublen) return join('', array_slice($t_string, $start, $sublen))."..."; return join('', array_slice($t_string, $start, $sublen)); } else { $start = $start*2; $sublen = $sublen*2; $strlen = strlen($string); $tmpstr = ''; for($i=0; $i< $strlen; $i++) { if($i>=$start && $i< ($start+$sublen)) { if(ord(substr($string, $i, 1))>129) { $tmpstr.= substr($string, $i, 2); } else { $tmpstr.= substr($string, $i, 1); } } if(ord(substr($string, $i, 1))>129) $i++; } if(strlen($tmpstr)< $strlen ) $tmpstr.= "..."; return $tmpstr; } }$str = "abcd需要截取的字符串"; echo cut_str($str, 8, 0, 'gb2312'); ?>
4. BugFree 的字符截取函数
<?php /*** @package BugFree* @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $*** Return part of a string(Enhance the function substr())** @author Chunsheng Wang <wwccss@263.net>* @param string$Stringthe string to cut.* @param int $Lengththe length of returned string.* @param booble$Appendwhether append "...": false|true* @return string the cutted string.*/ function sysSubStr($String,$Length,$Append = false) { if (strlen($String) < = $Length ) { return $String; } else { $I = 0; while ($I < $Length) { $StringTMP = substr($String,$I,1); if ( ord($StringTMP) >=224 ) { $StringTMP = substr($String,$I,3); $I = $I + 3; } elseif( ord($StringTMP) >=192 ) { $StringTMP = substr($String,$I,2); $I = $I + 2; } else { $I = $I + 1; } $StringLast[] = $StringTMP; } $StringLast = implode("",$StringLast); if($Append) { $StringLast .= "..."; } return $StringLast; } }$String = "CodeBit.cn -- 简单、精彩、通用"; $Length = "18"; $Append = false; echo sysSubStr($String,$Length,$Append); ?>
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