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HomeBackend DevelopmentPHP Tutorialphp自动获取关键字的方法_PHP

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。

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