How to automatically get keywords in php, get keywords in php_PHP tutorial

How to automatically get keywords in php, get keywords in php

The example in 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:

Copy code The code is as follows:

$mincipin=5;//Minimum word frequency
$minlen=4;//Minimum length of keyword
tiqukeyword($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);
}

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

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