php中高性能中文字符串截取函数分享
这是用了phpwind里面的一个字符串截取函数,他支持gbk,gbk2312,utf-8等多种编码的字符截取,也很好高效的支持中文字符串的处理,代码如下:
function substrs( $content , $length , $add = 'Y' ){ if ( strlen ( $content )> $length ) { if ( $GLOBALS [ 'db_charset' ]!= 'utf-8' ) { $retstr = '' ; for ( $i =0; $i < $length -2; $i ++) { $retstr .= ord( $content [ $i ]) > 127 ? $content [ $i ]. $content [++ $i ] : $content [ $i ]; } return $retstr .( $add == 'Y' ? ' ..' : '' ); } return utf8_trim( substr ( $content ,0, $length )).( $add == 'Y' ? ' ..' : '' ); } return $content ; } function utf8_trim( $str ) { $hex = '' ; $len = strlen ( $str )-1; for ( $i = $len ; $i >=0; $i -=1) { $ch = ord( $str [ $i ]); $hex .= " $ch" ; if (( $ch & 128)==0 || ( $ch & 192)==192) { return substr ( $str ,0, $i ); } } return $str . $hex ; } function cutstr( $string , $length , $dot = ' ...' ) { global $charset ; 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 ]; } //开源代码phpfensi测试数据 } $strcut = str_replace ( array ( '&' , '"' , '<' , '>' ), array ( '&' , '"' , '<' , '>' ), $strcut ); return $strcut . $dot ; }查看更多关于php中高性能中文字符串截取函数分享 - php函数的详细内容...
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