php自动获取关键字代码
$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 <( $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 '初步得到的数组：' ; print_r( $arr ); //echo '<br/><br/><br/><br/>'; $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 '<br/><br/><br/><br/>重叠加标记后的数组：' ; print_r( $arr ); //开源代码phpfensi.com $jieguoarr = array (); for ( $i =0; $i < $arrlong ; $i ++) { if ( $arr [ $i ][4]==0) $jieguoarr []= $arr [ $i ]; } echo '<br/><br/><br/><br/>' ; echo '最后得到的数组：' ; print_r( $jieguoarr ); }查看更多关于php自动获取关键字代码 - php高级应用的详细内容...
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