Code Learning for PHP string interception

Intercept 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 ', ' $ ', $str); } ?> Copy Code 2. Chinese character interception function supported by UTF-8 and GB2312 function Cut_str ($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; } } $str = "ABCD string to intercept"; Echo Cut_str ($STR, 8, 0, ' gb2312 '); ?> Copy Code 3. Bugfree Character intercept function 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-Simple, wonderful, universal"; $Length = "18"; $Append = false; Echo syssubstr ($String, $Length, $Append); ?> Copy Code

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