搜索引擎有多個關鍵字

Question

我有一個正在運行的搜索引擎，但只有當我搜索一個單詞時。 每當我搜索多個關鍵字時，我只得到1個結果。

示例：在我的數據庫中，我有'test'和'hello'等標簽; 每當我輸入“test hello”並單擊“Search”時，它會顯示：

1結果hello（這是帶有tag = hello的帖子的標題）。

我的代碼（search.php - 我獲得搜索結果的頁面）：

<?php

$button = $_GET ['submit'];
$search = $_GET ['search']; 

if(!$button) {
    echo "you didn't submit a keyword";
} else {
    if(strlen($search)<=1) {
        echo "Search term too short";
    } else {
        echo "You searched for <b>$search</b> <hr size='1'></br>";
        mysql_connect("localhost","root","root");
        mysql_select_db("myschool");

        $search_exploded = explode (" ", $search);

        foreach($search_exploded as $search_each) {
            $x = NULL;
            $construct = NULL;
            $x++;
            if($x==1) {
                $construct .="tag LIKE '%$search_each%'";
            } else {
                $construct .="OR tag LIKE '%$search_each%'";
            }

            $construct ="SELECT * FROM posts WHERE $construct";
            $run = mysql_query($construct);

            $foundnum = mysql_num_rows($run);

            if ($foundnum==0) {
                echo "Sorry, there are no matching result for <b>$search</b>.";
            } else {
                echo "$foundnum results found !<p>";

                while($runrows = mysql_fetch_assoc($run)) {
                    $title = $runrows ['title'];
                    $tag = $runrows ['tag'];

                    echo "<a href='#'><b>$title</b></a><br>";

                }
            }

        }
    }
}
?>

問題可能在$x=++部分，因為我認為引擎沒有顯示甚至搜索數據庫中的所有行，並且在num行計數> 1時不顯示。

先謝謝你們。

編輯：

我現在用上面的代碼獲得多個結果但是我以這種形式得到它們：

你搜索了hello test postare

找到1個結果！ HELLO 1搜索結果！

測試1結果發現！

postare noua

如何將結果添加到一個位置，而不是每次為不同的關鍵字找到新結果時都說出來？

Answer 1

您的代碼有幾個問題。 你錯過了"在這條線上：

echo "Sorry, there are no matching result for <b>$search</b>";

而最后的else沒有if

Answer 2

您需要在foreach語句之前啟動$ x變量，如果要將其用作整數，則不要將其設置為null。

$ construct變量有相同的錯誤，你必須有三次相同的響應，那是因為你必須在調用mysql select之前關閉foreach語句。

$x = 1;
$construct = NULL;

foreach($search_exploded as $search_each) 
{ 
    if($x==1) { 
        $construct .="tag LIKE '%$search_each%'"; 
    } else { 
        $construct .="OR tag LIKE '%$search_each%'"; 
    } 
    $x++;
}
$select ="SELECT * FROM posts WHERE $construct";
...

最后編輯

<?php

$button = $_GET ['submit'];
$search = $_GET ['search']; 

if(!$button) {
    echo "you didn't submit a keyword";
} else {
    if(strlen($search)<=1) {
        echo "Search term too short";
    } else {
        echo "You searched for <b>$search</b> <hr size='1'></br>";
        mysql_connect("localhost","root","root");
        mysql_select_db("myschool");

        $search_exploded = explode (" ", $search);
        $x = 1;
        $construct = '';

        foreach($search_exploded as $search_each) {
            if($x==1) {
                $construct .="tag LIKE '%$search_each%'";
            } else {
                $construct .="OR tag LIKE '%$search_each%'";
            }
            $x++;
        }

        $select ="SELECT * FROM posts WHERE $construct";
        $run = mysql_query($select);

        $foundnum = mysql_num_rows($run);

        if ($foundnum==0) {
            echo "Sorry, there are no matching result for <b>$search</b>.";
        } else {
            echo "$foundnum results found !<p>";

            while($runrows = mysql_fetch_assoc($run)) {
                $title = $runrows ['title'];
                $tag = $runrows ['tag'];

                echo "<a href='#'><b>$title</b></a><br>";

            }
        }
    }
}
?>