Php 搜索功能不适用于多个单词

我一直在一个网站上使用这个搜索功能，它从发布的单词中提取单词并搜索数据库。Iv对其进行了修改，以便它可以接受通过GET发送给它的来自网站另一部分的内容。我遇到的问题是，当你发送多个词时，比如searchstock=一些搜索词，它将无法工作。如果我只发送一个单词，比如searchstock=word，使用GET，它工作得很好，只有在发送多个单词时，它才不工作，只在数据库中显示所有结果。奇怪的是，通过POST进行多词搜索效果很好

    // Begin Search Section >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
    function search($db) {
        if (isset($_POST['searchstock'])){$words = $_POST['searchstock'];}
        if (isset($_GET['searchstock'])){$words = $_GET['searchstock'];}

    $searchQuery = ''; // search query is empty by default
    $searchCondition = "(cultivar LIKE '%%' OR description LIKE '%%' OR species LIKE '%%' OR colour LIKE '%%')";
    $searchFieldName = 'cultivar'; // name of the field to be searched
    $searchFieldName2 = 'description';
    $searchFieldName3 = 'species';
    $searchFieldName4 = 'colour';
    if(isset($_POST['searchstock']))
    { // check if a query was submitted
    $searchQuery = trim($_POST['searchstock']); // getting rid of unnecessary white space
    $searchTerms = explode(" ", $searchQuery); // Split the words
    $searchCondition = "($searchFieldName LIKE '%" . implode("%' OR $searchFieldName LIKE '%", $searchTerms) . "%')"; // Forming the condition for the sql
    $searchCondition .= " OR ($searchFieldName2 LIKE '%" . implode("%' OR $searchFieldName2 LIKE '%", $searchTerms) . "%')";
    $searchCondition .= " OR ($searchFieldName3 LIKE '%" . implode("%' OR $searchFieldName3 LIKE '%", $searchTerms) . "%')";
    $searchCondition .= " OR ($searchFieldName4 LIKE '%" . implode("%' OR $searchFieldName4 LIKE '%", $searchTerms) . "%')";
    }
    else if(isset($_GET['searchstock']))
    { // check if a query was submitted
    $searchQuery = trim($_GET['searchstock']); // getting rid of unnecessary white space
    $searchTerms = explode(" ", $searchQuery); // Split the words
    $searchCondition = "($searchFieldName LIKE '%" . implode("%' OR $searchFieldName LIKE '%", $searchTerms) . "%')"; // Forming the condition for the sql
    $searchCondition .= " OR ($searchFieldName2 LIKE '%" . implode("%' OR $searchFieldName2 LIKE '%", $searchTerms) . "%')";
    $searchCondition .= " OR ($searchFieldName3 LIKE '%" . implode("%' OR $searchFieldName3 LIKE '%", $searchTerms) . "%')";
    $searchCondition .= " OR ($searchFieldName4 LIKE '%" . implode("%' OR $searchFieldName4 LIKE '%", $searchTerms) . "%')";
    }
    // the rest is just database connection and retrieving the results
    $sql = <<<SQL
    SELECT * FROM stock WHERE $searchCondition;
    SQL;
    if(!$result = $db->query($sql)){ die('There was an error running the query [' . $db->error . ']');}
    while($row = $result->fetch_assoc()){        //Show your results here eg: $row['field1']
    $searchid = $row['id']; 
    $searchgenusid = $row['genusid'];
    // End Search
            // Search DB Function Start //
    $sql4 = <<<SQL
    SELECT * FROM `stock` WHERE `id` = '$searchid';
    SQL;
    if(!$stockresult = $db->query($sql4)){ die('There was an error running the query [' . $db->error . ']');}
    while($stockrow = $stockresult->fetch_assoc()){ 

//开始搜索部分>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
函数搜索（$db）{
如果（isset（$_POST['searchstock']）{$words=$_POST['searchstock']；}
if（isset（$_GET['searchstock']）{$words=$_GET['searchstock']；}
$searchQuery=''；//搜索查询默认为空
$searchCondition=“（类似于“%”的品种或类似于“%”的描述或类似于“%”的品种或类似于“%”的颜色”）；
$searchFieldName='cular'；//要搜索的字段的名称
$searchFieldName2='description'；
$searchFieldName3=物种；
$searchFieldName4='color'；
如果（isset（$_POST['searchstock']））
{//检查是否已提交查询
$searchQuery=trim（$_POST['searchstock']）；//清除不必要的空白
$searchTerms=explode（“，$searchQuery）；//拆分单词
$searchCondition=“（$searchFieldName类似“%”。内爆（“%”或$searchFieldName类似“%”，$searchTerms）。“%”；//形成sql语句的条件
$searchCondition.=“或（$searchFieldName2类似“%”。内爆（“%”或$searchFieldName2类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName3类似“%”。内爆（“%”或$searchFieldName3类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName4类似“%”。内爆（“%”或$searchFieldName4类似“%”，$searchTerms）。“%”）；
}
else if（isset（$\u GET['searchstock']））
{//检查是否已提交查询
$searchQuery=trim（$\u GET['searchstock']）；//清除不必要的空白
$searchTerms=explode（“，$searchQuery）；//拆分单词
$searchCondition=“（$searchFieldName类似“%”。内爆（“%”或$searchFieldName类似“%”，$searchTerms）。“%”；//形成sql语句的条件
$searchCondition.=“或（$searchFieldName2类似“%”。内爆（“%”或$searchFieldName2类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName3类似“%”。内爆（“%”或$searchFieldName3类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName4类似“%”。内爆（“%”或$searchFieldName4类似“%”，$searchTerms）。“%”）；
}
//剩下的只是数据库连接和检索结果
$sql=fetch_assoc（））{//在此处显示结果，例如：$row['field1']
$searchid=$row['id']；
$searchgenusid=$row['genusid']；
//结束搜索
//搜索数据库功能启动//
$sql4=fetch_assoc（））{

函数搜索（$db）{
$words=''
如果（isset（$_POST['searchstock']）{$words=$_POST['searchstock']；}
if（isset（$_GET['searchstock']）{$words=$_GET['searchstock']；}
如果（！空（$words）{
$searchQuery=''；//搜索查询默认为空
$searchCondition=“（类似于“%”的品种或类似于“%”的描述或类似于“%”的品种或类似于“%”的颜色”）；
$searchFieldName='cular'；//要搜索的字段的名称
$searchFieldName2='description'；
$searchFieldName3=物种；
$searchFieldName4='color'；
$searchQuery=trim（words）；//去除不必要的空白
$searchTerms=explode（“，$searchQuery）；//拆分单词
$searchCondition=“（$searchFieldName类似“%”。内爆（“%”或$searchFieldName类似“%”，$searchTerms）。“%”；//形成sql语句的条件
$searchCondition.=“或（$searchFieldName2类似“%”。内爆（“%”或$searchFieldName2类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName3类似“%”。内爆（“%”或$searchFieldName3类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName4类似“%”。内爆（“%”或$searchFieldName4类似“%”，$searchTerms）。“%”）；
//剩下的只是数据库连接和检索结果
$sql=fetch_assoc（））{
$searchid=$row['id']；
$searchgenusid=$row['genusid']；
//如果它的工作在_POST上，那么它也应该在_GET上工作
//你想干什么就干什么
}
}
}

函数搜索（$db）{
$words=''
如果（isset（$_POST['searchstock']）{$words=$_POST['searchstock']；}
if（isset（$_GET['searchstock']）{$words=$_GET['searchstock']；}
如果（！空（$words）{
$searchQuery=''；//搜索查询默认为空
$searchCondition=“（类似于“%”的品种或类似于“%”的描述或类似于“%”的品种或类似于“%”的颜色”）；
$searchFieldName='cular'；//要搜索的字段的名称
$searchFieldName2='description'；
$searchFieldName3=物种；
$searchFieldName4='color'；
$searchQuery=trim（words）；//去除不必要的空白
$searchTerms=explode（“，$searchQuery）；//拆分单词
$searchCondition=“（$searchFieldName类似“%”。内爆（“%”或$searchFieldName类似“%”，$searchTerms）。“%”；//形成sql语句的条件
$searchCondition.=“或（$searchFieldName2类似“%”。内爆（“%”或$searchFieldName2类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName3类似“%”。内爆（“%”或$searchFieldName3类似“%”，$searchTerms）。“%”）；
$searchCondition.=“或（$searchFieldName4类似“%”。内爆（“%”或$searchFieldName4类似“%”，$searchTerms）。“%”）；
//剩下的只是数据库连接和检索结果
$sql=fetch_assoc（））{
$searchid=
function search($db) {
    $words=''
    if (isset($_POST['searchstock'])){$words = $_POST['searchstock'];}
    if (isset($_GET['searchstock'])){$words = $_GET['searchstock'];}
    if (!empty($words){
      $searchQuery = ''; // search query is empty by default
      $searchCondition = "(cultivar LIKE '%%' OR description LIKE '%%' OR species LIKE '%%' OR colour LIKE '%%')";
      $searchFieldName = 'cultivar'; // name of the field to be searched
      $searchFieldName2 = 'description';
      $searchFieldName3 = 'species';
      $searchFieldName4 = 'colour';
      $searchQuery = trim(words); // getting rid of unnecessary white space
      $searchTerms = explode(" ", $searchQuery); // Split the words
      $searchCondition = "($searchFieldName LIKE '%" . implode("%' OR $searchFieldName LIKE '%", $searchTerms) . "%')"; // Forming the condition for the sql
      $searchCondition .= " OR ($searchFieldName2 LIKE '%" . implode("%' OR $searchFieldName2 LIKE '%", $searchTerms) . "%')";
      $searchCondition .= " OR ($searchFieldName3 LIKE '%" . implode("%' OR $searchFieldName3 LIKE '%", $searchTerms) . "%')";
      $searchCondition .= " OR ($searchFieldName4 LIKE '%" . implode("%' OR $searchFieldName4 LIKE '%", $searchTerms) . "%')";
      // the rest is just database connection and retrieving the results
      $sql = <<<SQL
      SELECT * FROM stock WHERE $searchCondition;
      SQL;
      if(!$result = $db->query($sql)){ 
        die('There was an error running the query [' . $db->error . ']');
      }
      while($row = $result->fetch_assoc()){
        $searchid = $row['id']; 
        $searchgenusid = $row['genusid'];

        //if its work on _POST then should also work on _GET
        //do what ever you want
      }
    }
}