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HomeBackend DevelopmentPHP Tutorial恶搞 关于腾讯的那道题截取字符串的题

题目是:
假设有"123abc456def789"这么一个字符串,写一个函数,可以传入一个字符串,和一个要截取的长度。返回截取后的结果。

要求:
标记不得计算在长度之内。
2 截取后的字符串,要保留原有标签,不过如果最后有一个标签没有闭合,则去掉其开始标签。

示例:
题中的字符串,要截取长度5,则返回的字符串应该为:123ab,要截取长度8,应返回123abc45。

<?php// QQ群:23930992function find($str, $size, &$string, &$number, &$saveString, &$newString) // 查找标签,当 PHP > 5.3 可以把注释去掉{    $i=$j=0;    while(strlen($saveString)<$size)    {        //loop:        if($str[$i] == '<')        {            $k=0;            $number[$j][$k++]=$i;            $string[$j]='';            do            {                $string[$j].=$str[$i];                if($str[$i] == '>')                {                    $number[$j++][$k++]=$i;                    break;                }            }while($str[$i++] != '>');        }        else        {            $saveString.=$str[$i];            /*if(strlen($saveString) == $size)            {                if($str[++$i] =='<')                {                    goto loop;                }                $i--;            }*/        }        $i++;    }    for($j=0; $j<$i; $j++)    {        $newString.=$str[$j];    }}function filter($str)  // 过滤标签,然后进行比较{    $newstr    = '';    $strLength = strlen($str);    for($i=0;$i<$strLength;$i++)    {        switch($str[$i])        {            case '<' : continue;            case '/' : continue;            case '>' : continue;            case ' ' : break;            default  : $newstr .= $str[$i];        }    }    return $newstr;}function deleteReservedTag(&$string, &$number, $reserved) // 从标签组里去除 保留标签{	$stringLength   = count($string);	$reservedLength = count($reserved);    for($i=0; $i<$stringLength;$i++)      // 去掉保留标签部分    {        for($j=0;$j < $reservedLength;$j++)        {            if( filter($string[$i]) == filter($reserved[$j]) )            {                $string[$i] = NULL;                for($k=0;$k<2;$k++)                {                    $number[$i][$k] = NULL;                }            }        }    }    $tempString[]    = '';    $tempNumber[][]  = 0;    for($i=0,$j=0; $i < $stringLength; $i++) // 把空的地方填补    {        if($string[$i] != NULL)        {            $tempString[$j]=$string[$i];            for($k=0;$k<2;$k++)            {                $tempNumber[$j][$k] = $number[$i][$k];            }            $j++;        }    }    $string = $tempString;    $number = $tempNumber;}function compare(&$string, &$number)     //比较成对标签{	$stringLength = count($string);    for($i=0; $i < $stringLength; $i++)  //删除成对标签    {        for($j = $i+1; $j < $stringLength; $j++)        {            if( filter($string[$i]) == filter($string[$j]) )            {                $string[$i] = NULL;                $string[$j] = NULL;                for($k=0;$k<2;$k++)                {                    $number[$i][$k] = NULL;                }                for($k=0;$k<2;$k++)                {                    $number[$j][$k] = NULL;                }            }        }    }    $tempString[]    = '';    $tempNumber[][]  = 0;    for($i=0,$j=0; $i < $stringLength; $i++) // 把空的地方填补    {        if($string[$i] != NULL)        {            $tempString[$j]=$string[$i];            for($k=0;$k<2;$k++)            {                 $tempNumber[$j][$k] = $number[$i][$k];            }            $j++;        }    }    $string = $tempString;    $number = $tempNumber;}function replace(&$string, $number, $newString){    $tempString       = '';    $saveStringLength = strlen($newString);    $stringLength     = count($string);    //echo $saveStringLength."\n".$stringLength;    for($i=0, $j=0; $i < $saveStringLength; $i++)    {        if( $j < $stringLength )        {            if( $i == $number[$j][0])            {                $begin = $number[$j][1] - $number[$j][0];                while($begin)                {                    $begin--;                    $i++;                }               $j++;               $i++;            }        }       $tempString .= $newString[$i];    }    $string = $tempString;}$str = '<p align="center"><b>123<br /><em>abc</em>45<hr />6</b>defg<i>789</i></p>';$size=15;$reserved = array //保留标签(    '<br />',    '<br>',    '<hr />',    '<hr>');$string[]='';                                                  // 保存所有标签$number[][]=0;                                                 // 保存所有标签位置$saveString = '';                                              // 保存截取标签后的所有字符串$newString  = '';                                              // 保存所有未截取标签的字符串find($str, $size, $string, $number, $saveString, $newString);  // 查找标签deleteReservedTag($string, $number, $reserved);                // 从标签组里去除 保留标签compare($string, $number);                                     // 从标签组里去除 成对标签replace($string, $number, $newString);printf("截取长度:%d\n\n", $size);printf("完整长度:%s\n\n",$str);printf("处理结果:%s\n\n", $string);printf("截取长度:%s (%s)\n\n",$saveString,strlen($saveString));printf("未处理前:%s\n",$newString);?>



运算结果如下
------------------------------------------------------------------------------------
截取长度:15

完整长度:

123
abc45


6defg789



处理结果:123
abc45
6
defg78

截取长度:123abc456defg78 (15)

未处理前:

123
abc45


6defg78


回复讨论(解决方案)

P4+768MB 机运行速度如下

内存使用情况:2176
算法运行时间(microtime):0.0012378692626953

欢迎各位 PHP 爱好者来  QQ群:23930992

程序处理一些特殊数据的时候会出问题,请把代码粘贴到上面

function filter($str)  // 过滤标签,然后进行比较
{
    $newstr    = '';
    $strLength = strlen($str);
    for($i=0;$i     {
        switch($str[$i])
        {
            case '             case '/' : continue;
            case '>' : continue;
            case ' ' : break 2;
            default  : $newstr .= $str[$i];
        }
    }
    return $newstr;
}

又修正一个错误,请把下面代码粘贴到上面

function replace(&$string, $number, $newString){    $tempString       = '';    $saveStringLength = strlen($newString);    $stringLength     = count($string);    for($i=0, $j=0; $i < $saveStringLength; $i++)    {        if( $j < $stringLength )        {            if( $i == $number[$j][0])            {                $begin = $number[$j][1] - $number[$j][0];                while($begin)                {                    $begin--;                    $i++;                }               $j++;            }        }        else        {           $tempString .= $newString[$i];        }    }    $string = $tempString;}


完整修改后的代码

<?php// QQ群:23930992function find($str, $size, &$string, &$number, &$saveString, &$newString) // 查找标签,当 PHP > 5.3 可以把注释去掉{    $i=$j=0;    while(strlen($saveString)<$size)    {        //loop:        if($str[$i] == '<')        {            $k=0;            $number[$j][$k++]=$i;            $string[$j]='';            do            {                $string[$j].=$str[$i];                if($str[$i] == '>')                {                    $number[$j++][$k++]=$i;                    break;                }            }while($str[$i++] != '>');        }        else        {            $saveString.=$str[$i];            /*if(strlen($saveString) == $size)            {                if($str[++$i] =='<')                {                    goto loop;                }                $i--;            }*/        }        $i++;    }    for($j=0; $j<$i; $j++)    {        $newString.=$str[$j];    }}function filter($str)  // 过滤标签,然后进行比较{    $newstr    = '';    $strLength = strlen($str);    for($i=0;$i<$strLength;$i++)    {        switch($str[$i])        {            case '<' : continue;            case '/' : continue;            case '>' : continue;            case ' ' : break 2;            default  : $newstr .= $str[$i];        }    }    return $newstr;}function deleteReservedTag(&$string, &$number, $reserved) // 从标签组里去除 保留标签{	$stringLength   = count($string);	$reservedLength = count($reserved);    for($i=0; $i<$stringLength;$i++)      // 去掉保留标签部分    {        for($j=0;$j < $reservedLength;$j++)        {            if( filter($string[$i]) == filter($reserved[$j]) )            {                $string[$i] = NULL;                for($k=0;$k<2;$k++)                {                    $number[$i][$k] = NULL;                }            }        }    }    $tempString[]    = '';    $tempNumber[][]  = 0;    for($i=0,$j=0; $i < $stringLength; $i++) // 把空的地方填补    {        if($string[$i] != NULL)        {            $tempString[$j]=$string[$i];            for($k=0;$k<2;$k++)            {                $tempNumber[$j][$k] = $number[$i][$k];            }            $j++;        }    }    $string = $tempString;    $number = $tempNumber;}function compare(&$string, &$number)     //比较成对标签{	$stringLength = count($string);    for($i=0; $i < $stringLength; $i++)  //删除成对标签    {        for($j = $i+1; $j < $stringLength; $j++)        {            if( filter($string[$i]) == filter($string[$j]) )            {                $string[$i] = NULL;                $string[$j] = NULL;                for($k=0;$k<2;$k++)                {                    $number[$i][$k] = NULL;                }                for($k=0;$k<2;$k++)                {                    $number[$j][$k] = NULL;                }            }        }    }    $tempString[]    = '';    $tempNumber[][]  = 0;    for($i=0,$j=0; $i < $stringLength; $i++) // 把空的地方填补    {        if($string[$i] != NULL)        {            $tempString[$j]=$string[$i];            for($k=0;$k<2;$k++)            {                 $tempNumber[$j][$k] = $number[$i][$k];            }            $j++;        }    }    $string = $tempString;    $number = $tempNumber;}function replace(&$string, $number, $newString){    $tempString       = '';    $saveStringLength = strlen($newString);    $stringLength     = count($string);    for($i=0, $j=0; $i < $saveStringLength; $i++, $j=0)    {        while( $j < $stringLength )        {            if( $i == $number[$j][0])            {                $i = $number[$j][1];                $i++;            }            $j++;        }        $tempString .= $newString[$i];    }    $string = $tempString;}$sttime = microtime(true);$stmem = memory_get_usage();$str = '        <table id="ctl00_ContentPlaceHolder1_BidDomainName1_Shop1_htmlShop" width="99%" border="0" cellspacing="0" cellpadding="0">	<tr>		<td valign="top"><img  src="/static/imghwm/default1.png"  data-src="http://auction.ename.cn/images/nopic.gif"  class="lazy"  id="ctl00_ContentPlaceHolder1_BidDomainName1_Shop1_imgShopLogo"    style="max-width:90%" / alt="恶搞 关于腾讯的那道题截取字符串的题" ></td>		<td><h5 id="的玉米小店">364867的玉米小店</h5>                买家信用:<a id="ctl00_ContentPlaceHolder1_BidDomainName1_Shop1_hlBuyerCreditLink" title="0" href="/Customer/UserEvaluate.aspx?uid=364867&from=seller" target="_blank">0<span class="goodssaletitle2"></span></a><br />                卖家好评率:100.00%<br />                买家好评率:0.00%<br />                注册时间:2010年04月29日<br />                <div style="width:230px">荣誉资质:<img  src="/static/imghwm/default1.png"  data-src="/images/scicon.gif"  class="lazy"   alt="恶搞 关于腾讯的那道题截取字符串的题" ></div>                <div><a id="ctl00_ContentPlaceHolder1_BidDomainName1_Shop1_hlShopUrl" href="http://364867.shop.ename.cn"><img  src="/static/imghwm/default1.png"  data-src="/images/scicon.gif"  class="lazy"      style="max-width:90%"  style="max-width:90%" border="0" / alt="恶搞 关于腾讯的那道题截取字符串的题" ></a></div></td>	</tr></table>                </td>      </tr>      <tr>        <td class="shopbg04"> </td>      </tr>    </table>';$size=160;$reserved = array //保留标签(    '<br />',    '<br>',    '<hr />',    '<hr>',    '<img  / alt="恶搞 关于腾讯的那道题截取字符串的题" >',    '<img  alt="恶搞 关于腾讯的那道题截取字符串的题" >');$string[]='';                                                  // 保存所有标签$number[][]=0;                                                 // 保存所有标签位置$saveString = '';                                              // 保存截取标签后的所有字符串$newString  = '';                                              // 保存所有未截取标签的字符串find($str, $size, $string, $number, $saveString, $newString);  // 查找标签deleteReservedTag($string, $number, $reserved);                // 从标签组里去除 保留标签compare($string, $number);                                     // 从标签组里去除 成对标签replace($string, $number, $newString);printf("截取长度:%d\n\n", $size);printf("完整长度:%s\n\n",$str);printf("处理结果:%s\n\n", $string);printf("截取长度:%s (%s)\n\n",$saveString,strlen($saveString));printf("未处理前:%s\n",$newString);echo "内存使用情况:",(memory_get_usage()-$stmem),"\n";echo "算法运行时间(microtime):",(microtime(true)-$sttime),"\n";?>




截取长度:160




完整长度:
        






恶搞 关于腾讯的那道题截取字符串的题
364867的玉米小店

                买家信用:0

                卖家好评率:100.00%

                买家好评率:0.00%

                注册时间:2010年04月29日

                
荣誉资质:恶搞 关于腾讯的那道题截取字符串的题

                
恶搞 关于腾讯的那道题截取字符串的题


        
        
      
      
         
      
    





处理结果:
        

恶搞 关于腾讯的那道题截取字符串的题
364867的玉米小店

                买家信用:0

                卖家好评率:100.00%

                买家好评率:0.00%

                注册





截取长度:
        


364867的玉米小店
                买家信用:0
                卖家好评率:100.00%
                买家好评率:0.00%
                注册 (160)






未处理前:
        


恶搞 关于腾讯的那道题截取字符串的题
364867的玉米小店

                买家信用:0

                卖家好评率:100.00%

                买家好评率:0.00%

                注册


内存使用情况:5096

算法运行时间(microtime):0.0040628910064697

精简后的代码

<?php// QQ群:23930992function find($str, $size, &$string, &$number, &$saveString, &$newString) // 查找标签并保存到标签组{    $i=$j=0;    while(strlen($saveString)<$size)    {        if($str[$i] == '<')        {            $k=0;            $number[$j][$k++]=$i;            $string[$j]='';            do            {                $string[$j].=$str[$i];                $i++;            }while($str[$i] != '>');            $number[$j++][$k]=$i;        }        else        {            $saveString.=$str[$i];        }        $i++;    }    for($j=0; $j<$i; $j++)    {        $newString.=$str[$j];    }}function filter($str)  // 过滤标签,然后进行比较{    $newstr    = '';    $strLength = strlen($str);    for($i=0;$i<$strLength;$i++)    {        switch($str[$i])        {            case '<' : continue;            case '/' : continue;            case '>' : continue;            case ' ' : break 2;            default  : $newstr .= $str[$i];        }    }    return $newstr;}function deleteReservedTag(&$string, &$number, $reserved) // 从标签组里去除 保留标签{    $stringLength   = count($string);    $reservedLength = count($reserved);    for($i=0; $i<$stringLength;$i++)      // 去掉保留标签部分    {        for($j=0;$j < $reservedLength;$j++)        {            if( filter($string[$i]) == filter($reserved[$j]) )            {                $string[$i] = NULL;                for($k=0;$k<2;$k++)                {                    $number[$i][$k] = NULL;                }            }        }    }}function compare(&$string, &$number)     //比较成对标签{    $stringLength = count($string);    for($i=0; $i < $stringLength; $i++)  //删除成对标签    {        for($j = $i+1; $j < $stringLength; $j++)        {            if( filter($string[$i]) == filter($string[$j]) )            {                $string[$i] = $string[$j] = NULL;                for($k=0;$k<2;$k++)                {                    $number[$i][$k] = $number[$j][$k] = NULL;                }            }        }    }        //begin 把标签组空的地方 填补 (你可以去除本小段代码,代价是运行时间增加了)    $tempString[]    = '';    $tempNumber[][]  = 0;    for($i=0,$j=0; $i < $stringLength; $i++)    {        if($string[$i] != NULL)        {            $tempString[$j]=$string[$i];            for($k=0;$k<2;$k++)            {                 $tempNumber[$j][$k] = $number[$i][$k];            }            $j++;        }    }    $string = $tempString;    $number = $tempNumber;    //end}function replace(&$string, $number, $newString) // 核心代码 ...{    $tempString       = '';    $saveStringLength = strlen($newString);    $stringLength     = count($string);    for($i=0, $j=0; $i < $saveStringLength; $i++, $j=0)    {        while( $j < $stringLength )        {            if( $i == $number[$j][0])            {                $i = $number[$j][1];                $i++;            }            $j++;        }        $tempString .= $newString[$i];    }    $string = $tempString;}$sttime = microtime(true);$stmem = memory_get_usage();$str = '<p align="center"><b>123<br /><em>abc</em>45<hr />6</b>d<strong>efg<i>789</i></strong></p>';$size=15;$reserved = array //保留标签(    '<br />',    '<br>',    '<hr />',    '<hr>',    '<img  / alt="恶搞 关于腾讯的那道题截取字符串的题" >',    '<img  alt="恶搞 关于腾讯的那道题截取字符串的题" >');$string[]='';                                                  // 保存所有标签$number[][]=0;                                                 // 保存所有标签位置$saveString = '';                                              // 保存截取标签后的所有字符串$newString  = '';                                              // 保存所有未截取标签的字符串find($str, $size, $string, $number, $saveString, $newString);  // 查找标签deleteReservedTag($string, $number, $reserved);                // 从标签组里去除 保留标签compare($string, $number);                                     // 从标签组里去除 成对标签//deleteSpaceArray($string, $number);                          // 删除标签组里空下来的空间//deleteSpaceArray($string, $number);                          // 删除标签组里空下来的空间replace($string, $number, $newString);printf("截取长度: %u\n\n", $size);printf("完整长度: %s\n\n", $str);printf("截取长度: %s  (%u)\n\n", $saveString, strlen($saveString));printf("处理结果: %s\n\n", $string);printf("未处理前: %s\n\n", $newString);printf("内存使用情况:%u\n", memory_get_usage()-$stmem);printf("算法运行时间(microtime): %f\n", microtime(true)-$sttime);?>

研究得好透彻啊   

人都去那了啊,郁闷了

$s = '123<em>abc</em>456<em>def</em>789<em>def</em>789<em>def</em>789<em>def</em>789';function subs($s, $len){//此函数参数有二:$s - 源字符串,    $len - 要截取的长度        (当让你也可以将标签传进来,不过要进行其他操作)    $s1 = $s;    $s1 = preg_replace('/<\/?em>/s', '', $s1);    $sub = mb_substr($s1, 0, $len, 'gbk');    //处理成数组    $s2 = $s;    $s2 = preg_replace('/<\/?em>/s', '[p]', $s2);    $arr = explode('[p]', $s2);    $arr1 = $arr2 = array();    $num = count($arr);    $num1 = $num2 = 0;    $bs = 0;    for($i = 0; $i < $num; $i++){        $arr1[] = strlen($arr[$i]);        $num2 = array_sum($arr1);        if($num2 >= $len){            $num1 = $len - $num2 + strlen($arr[$i]);            if($num1 != strlen($arr[$i]))$bs = 1            $s3 = mb_substr($arr[$i], 0, $num1, 'gbk');            $arr[$i] = $s3;            $arr2 = array_slice($arr, 0, $i + 1);            break;        }    }    //处理数组,结合成所需要的成字符串    $num = count($arr2);    $s4 = '';    for($i =  0; $i < $num; $i++){        if($i % 2 == 0){            if(($i + 1 == $num && $bs == 1) || ($i + 2 == $num && $bs == 1) || ($num % 2 == 1 && $i + 1 == $num)){                $s4 .= $arr2[$i];            }else{                $s4 .= $arr2[$i]."<em>";            }        }else{            if($i + 1 == $num && $bs == 1){                $s4 .= $arr2[$i];            }else{                $s4 .= $arr2[$i]."</em>";            }        }    }    //返回结果    return $s4;}$s = subs($s, 17);echo $s;

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PHP: Creating Interactive Web Content with EasePHP: Creating Interactive Web Content with EaseApr 14, 2025 am 12:15 AM

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python: Comparing Two Popular Programming LanguagesPHP and Python: Comparing Two Popular Programming LanguagesApr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

The Enduring Relevance of PHP: Is It Still Alive?The Enduring Relevance of PHP: Is It Still Alive?Apr 14, 2025 am 12:12 AM

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

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