php - 如何用php和mysql制作全文搜索引擎？

Question

我使用开源代码创建了一个 php 搜索引擎。我创建了一个数据库和一个包含 5 列的表:

标题、说明、关键字、链接、日期

我使用的代码是下面的 php 代码:

<?php
    $keywords = $_GET ['input'];        
     $keywords = "Led Zeppelin";
$words = explode(" ",$keyword);

foreach ($words as $w) {
    $keyword_parts .= "+" . $w ." ";
}
$keyword_parts = substr($keyword_parts,0,-1);
$query = "SELECT
          *,
          MATCH (keywords,title) AGAINST ('" . $keywords . "') as score
          FROM search
          WHERE MATCH (keywords,title) AGAINST ('" . $keyword_parts . "' IN BOOLEAN MODE)
          ORDER BY score DESC";

    //connect
    mysql_connect ("localhost", "root", "password");
    mysql_select_db("intranet");

    $query = mysql_query($query);
    $numrows = mysql_num_rows ($query);
    if($numrows >0){
        while ($row = mysql_fetch_assoc($query)){
            $id = $row ['id'];
            $title = $row ['title'];
            $description = $row ['description'];
            $keywords = $row ['keywords'];
            $link = $row ['link'];
            $date = $row ['date'];

            echo "<h2><a href='$link'>$title</a><h2/>
            $description <br /><br />";
        }
    }
    else 
        echo "No results found for \"<b>$each</b>\" ";

    //disconnect
    mysql_close();
?>

搜索脚本工作正常，但唯一的问题是它按关键字搜索，这增加了搜索结果，但很难找到您想要的内容，因为不同条目上的许多关键字匹配。

现在，我正在网上阅读有关全文搜索的内容(“全文搜索是使用 MATCH() ... AGAINST 语法执行的。MATCH()”)，但我不知道如何将其应用到我的代码中。

Answer 1

这是我过去用过的。此外，您正在执行 MATCH 的列必须更改为允许全文:

    $keyword = "Led Zeppelin";
    $words = explode(" ",$keyword);

    $keyword_parts = '';
    foreach ($words as $w) {
        $keyword_parts .= "+" . $w ." ";
    }
    $keyword_parts = substr($keyword_parts,0,-1);
    $query = "SELECT
              *,
              MATCH (column1,column2) AGAINST ('" . $keyword . "') as score
              FROM table
              WHERE MATCH (column1,column2) AGAINST ('" . $keyword_parts . "' IN BOOLEAN MODE)
              ORDER BY score DESC";