(utility) Multiple PHP Chinese string intercept function

String interception is a very common programming task, and often a string interception with Chinese is often used. Although not difficult, but write their own function implementation and time-consuming, here is a more useful string interception function, capable of basic requirements

<?phpfunction 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 = "Concise Modern magic-a variety of technologies focused on the mainstream of the Internet"; $length = "27"; $append = true; Echo syssubstr ($string, $length, $append); Output//Concise modern magic--special ...? >

Intercept GB2312 Chinese string:

<?php//intercept Chinese string 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;}? >

To intercept UTF8 encoded multibyte strings:

<?php//intercepts UTF8 string 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 ',                       ' $ ', $str);}? >

UTF-8, GB2312 are supported by the Chinese character interception function:

<?php/* Utf-8, gb2312 both support the Chinese character interception function Cut_str (string, intercept length, start length, encoding);         The encoding defaults to utf-8 start length default to 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[0])-$start > $sublen) return join ("', Array_slice ($t _string[0], $start, $sublen))."         ...";     return join ("', Array_slice ($t _string[0], $start, $sublen));         } else {$start = $start * *;         $sublen = $sublen;         $strlen = strlen ($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; }} $str = "ABCD needs to intercept the string"; Echo Cut_str ($STR, 8, 0, ' gb2312 ');?>

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