Home > Backend Development > PHP Tutorial > PHP automatically obtains keyword codes_PHP tutorial

PHP automatically obtains keyword codes_PHP tutorial

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
Release: 2016-07-20 11:09:32
Original
946 people have browsed it

php tutorial automatically obtains keyword codes

$mincipin=5;//minimum word frequency

$minlen=4;//minimum keyword length

tiqukeyword($tiqustr,$minlen,$mincipin);

function tiqukeyword($tiqustr,$minlen,$mincipin)

{$strlong=strlen($tiqustr);

$arr=array();

$k=-1;

for($i=0;$i<($strlong-$mincipin*$minlen);$ i++){

$end=ceil(($strlong-$i)/$mincipin+$i);

for($j=$minlen;$j<$end;$j++ ){$num=0;

if(($guanjianzi=substr($tiqustr,$i,$j))!==false){

$wz=$i+$j ;

$num++;}

else{break;}

while($wz<$strlong){if(($wz=strpos($tiqustr,$guanjianzi ,$wz))!==false)

{$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 'Initially obtained array:';

print_r($arr);

//echo '



';

$arrlong=count($arr);

for($i=0;$i<$arrlong;$i++){

$bjarr= $arr[$i];

$nowid=$i;

if($bjarr[4]==1)continue;

for($j=$ i+1;$j<$arrlong;$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($a< =$qujianks&&$qujianks<=$b&&$a<=$qujianjs&&$qujianjs<=$b)

{if($bjarr[3]<=$arr[$j][3]){

$arr[$nowid][4]=1;$nowid=$j;$bjarr=$arr[$j];
}
}

elseif( $qujianks<=$a&&$a<=$qujianjs&&$qujianks<=$b&&$b<=$qujianjs){

$arr[$j][4]=1;
}

}

}

echo '



Overlapping and marked array: ';

print_r($arr);

$jieguoarr=array();

for($i =0;$i<$arrlong;$i++)

{if($arr[$i][4]==0)$jieguoarr[]=$arr[$i];

}

echo '



';

echo 'Finally obtained array:';

print_r($jieguoarr);

}


www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444790.htmlTechArticlephp tutorial automatically obtains keyword code $mincipin=5;//minimum word frequency $minlen=4;//key Minimum word length tiqukeyword($tiqustr,$minlen,$mincipin); function tiqukeyword($tiqustr,$minlen,$mi...
Statement of this Website
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
Latest Issues
php data acquisition?
From 1970-01-01 08:00:00
0
0
0
PHP extension intl
From 1970-01-01 08:00:00
0
0
0
How to learn php well
From 1970-01-01 08:00:00
0
0
0
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template