How to automatically obtain keywords in php_PHP tutorial

How to automatically obtain keywords in php

This article describes the method of automatically obtaining keywords in php. Share it with everyone for your reference.

The specific implementation method is as follows:

The code is as follows: $mincipin=5;//Minimum word frequency

　$minlen=4;//Minimum length of keywords

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 marked array: ';

print_r($arr);

$jieguoarr=array();

　for($i=0;$i<$arrlong;$i )

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

　}

echo '

　;

echo 'The final array:';

print_r($jieguoarr);

　}

I hope this article will be helpful to everyone’s PHP programming design.

http://www.bkjia.com/PHPjc/991643.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/991643.htmlTechArticleHow to automatically obtain keywords in php. This article describes how to automatically obtain keywords in php. Share it with everyone for your reference. The specific implementation method is as follows: The code is as follows: $mincipin=5;//The most...