PHP截取字符串<br /> PHP截取字符串,用函数截取字符串的专题,支持UTF-8、GB2312、GBK多种字符集。<br /> 截取GB2312中文字符串<br /> &lt;?php<br /> //截取中文字符串<br /> function mysubstr($str, $start, $len) {<br /> $tmpstr = &quot;&quot;;<br /> $strlen = $start + $len;<br /> for($i = 0; $i &lt; $strlen; $i++) {<br /> if(ord(substr($str, $i, 1)) &gt; 0xa0) {<br /> $tmpstr .= substr($str, $i, 2);<br /> $i++;<br /> } else<br /> $tmpstr .= substr($str, $i, 1);<br /> }<br /> return $tmpstr;<br /> }<br /> ?&gt;<br /> <br /> 截取utf8编码的多字节字符串 <br /> &lt;?php<br /> //截取utf8字符串<br /> function utf8Substr($str, $from, $len)<br /> {<br /> return preg_replace(#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,.$from.}.<br /> ((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,.$len.}).*#s,<br /> $1,$str);<br /> }<br /> ?&gt;<br /> <br /> UTF-8、GB2312都支持的汉字截取函数<br /> &lt;?php<br /> /* <br /> Utf-8、gb2312都支持的汉字截取函数 <br /> cut_str(字符串, 截取长度, 开始长度, 编码); <br /> 编码默认为 utf-8 <br /> 开始长度默认为 0 <br /> */ <br /> <br /> function cut_str($string, $sublen, $start = 0, $code = UTF-8) <br /> { <br /> if($code == UTF-8) <br /> { <br /> $pa = &quot;/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/&quot;; <br /> preg_match_all($pa, $string, $t_string); <br /> <br /> if(count($t_string[0]) - $start &gt; $sublen) return join(, array_slice($t_string[0], $start, $sublen)).&quot;...&quot;; <br /> return join(, array_slice($t_string[0], $start, $sublen)); <br /> } <br /> else <br /> { <br /> $start = $start*2; <br /> $sublen = $sublen*2; <br /> $strlen = strlen($string); <br /> $tmpstr = ; <br /> <br /> for($i=0; $i&lt; $strlen; $i++) <br /> { <br /> if($i&gt;=$start &amp;&amp; $i&lt; ($start+$sublen)) <br /> { <br /> if(ord(substr($string, $i, 1))&gt;129) <br /> { <br /> $tmpstr.= substr($string, $i, 2); <br /> } <br /> else <br /> { <br /> $tmpstr.= substr($string, $i, 1); <br /> } <br /> } <br /> if(ord(substr($string, $i, 1))&gt;129) $i++; <br /> } <br /> if(strlen($tmpstr)&lt; $strlen ) $tmpstr.= &quot;...&quot;; <br /> return $tmpstr; <br /> } <br /> } <br /> <br /> $str = &quot;abcd需要截取的字符串&quot;; <br /> echo cut_str($str, 8, 0, gb2312); <br /> ?&gt;<br /> <br /> PHP字符截取函数<br /> &lt;?php<br /> function sysSubStr($String,$Length,$Append = false) <br /> { <br /> if (strlen($String) &lt; = $Length ) <br /> { <br /> return $String; <br /> } <br /> else <br /> { <br /> $I = 0; <br /> while ($I &lt; $Length) <br /> { <br /> $StringTMP = substr($String,$I,1); <br /> if ( ord($StringTMP) &gt;=224 ) <br /> { <br /> $StringTMP = substr($String,$I,3); <br /> $I = $I + 3; <br /> } <br /> elseif( ord($StringTMP) &gt;=192 ) <br /> { <br /> $StringTMP = substr($String,$I,2); <br /> $I = $I + 2; <br /> } <br /> else <br /> { <br /> $I = $I + 1; <br /> } <br /> $StringLast[] = $StringTMP; <br /> } <br /> $StringLast = implode(&quot;&quot;,$StringLast); <br /> if($Append) <br /> { <br /> $StringLast .= &quot;...&quot;; <br /> } <br /> return $StringLast; <br /> } <br /> } <br /> <br /> $String = &quot; 简单、精彩、通用&quot;; <br /> $Length = &quot;18&quot;; <br /> $Append = false; <br /> echo sysSubStr($String,$Length,$Append); <br /> ?&gt;<br />
RangeTime:0.012092s
RangeMem:211.61 KB
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