Home >Backend Development >PHP Tutorial >php自动获取关键字的方法_PHP

php自动获取关键字的方法_PHP

WBOY
WBOYOriginal
2016-05-31 13:18:19786browse

本文实例讲述了php自动获取关键字的方法。分享给大家供大家参考。

具体实现方法如下:

代码如下:

$mincipin=5;//最小词频
$minlen=4;//关键字最小长度
tiqukeyword($tiqustr,$minlen,$mincipin);
function tiqukeyword($tiqustr,$minlen,$mincipin)
{$strlong=strlen($tiqustr);
$arr=array();
$k=-1;
for($i=0;$i $end=ceil(($strlong-$i)/$mincipin+$i);
for($j=$minlen;$j if(($guanjianzi=substr($tiqustr,$i,$j))!==false){
$wz=$i+$j;
$num++;}
else{break;}
while($wz {$num++;
$wz=$wz+strlen($guanjianzi);}
else break;
}
if($j==$minlen){
if($num>=$mincipin){$maxnum=$num;$k++;$str=substr($tiqustr,$i,$j);
$arr[$k]=array($i,$j,$str,$num,0);
}
else{break;}
}
else{
if($num>=$maxnum){
$maxnum=$num;
$str=substr($tiqustr,$i,$j);
$arr[$k]=array($i,$j,$str,$num,0);
}
else break;
}
}
}
echo '初步得到的数组:';
print_r($arr);
//echo '



';
 
$arrlong=count($arr);
for($i=0;$i $bjarr=$arr[$i];
$nowid=$i;
if($bjarr[4]==1)continue;
for($j=$i+1;$j if($arr[$j][4]==1)continue;
$qujianks=$bjarr[0];
$qujianjs=$bjarr[1]+$bjarr[0]-1;
$a=$arr[$j][0];
$b=$arr[$j][1]+$arr[$j][0]-1;
if(($bjarr[2]==$arr[$j][2])&&($bjarr[3]>$arr[$j][3]))$arr[$j][4]=1;
 
if($a {if($bjarr[3] $arr[$nowid][4]=1;$nowid=$j;$bjarr=$arr[$j];
}
}
elseif($qujianks $arr[$j][4]=1;
}
}
}
 
echo '



重叠加标记后的数组:';
print_r($arr);
$jieguoarr=array();
for($i=0;$i {if($arr[$i][4]==0)$jieguoarr[]=$arr[$i];
 
}
echo '



';
echo '最后得到的数组:';
print_r($jieguoarr);
}

希望本文所述对大家的php程序设计有所帮助。

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn