How PHP automatically gets the keyword

The example in this article describes the way PHP automatically gets keywords. Share to everyone for your reference.

The implementation methods are as follows:

The code is as follows: $mincipin =5;//minimum Word frequency

$minlen =4;//keyword Minimum 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 ' Preliminary 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 tagged array: ';

Print_r ($arr);

$jieguoarr =array ();

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

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

}

Echo '

';

Echo ' last obtained array: ';

Print_r ($jieguoarr);

}

I hope this article will help you with your PHP program design.