组合多个变量-使用POST

下面是我的意思的一个例子：

JS：

<script>
        //Combine the two forms into one string of data
        //to send one ajax call instead of two
        var selectedPeople = "";
        function showUsers() {
            selectedPeople += $('#testform').serialize();
            selectedPeople += $('#testform2').serialize();
            document.getElementById("txtHint").innerHTML = "<div class='loading-indication'><img src='ajax-loader.gif' /> &nbsp; Please wait... Loading New Courses...</div>";
            $.ajax({
                url:'getuser.php',
                type:'post',
                data:selectedPeople,
                success:function(res){
                    $('#txtHint').html(res);
                }
            });
        }
    </script>

PHP：

 <?php
    //Globals and includes should go near the top
    //Look up PSR coding standards for php for good formatting
    include("includes/db.php"); 
    global $con;
    $person = '';
    $person  = isset($_POST['person']) ? $_POST['person'] : '';
    $allIds = '';
    if ($person!='') {
        foreach($person as $personid)
        {
            $allIds .= $personid.',';
        }
        $personid = rtrim($allIds,',');
    }

    $person2 = '';
    $person2  = isset($_POST['person2']) ? $_POST['person2'] : '';
    $allIds2 = '';
    if ($person2!='') {
        foreach($person2 as $personid2)
        {
            $allIds2 .= $personid2.',';
        }
        $personid2 = rtrim($allIds2,',');
    }
    //Okay to put strings on multiple lines for better reading
    $sql= "
        SELECT * FROM courses 
        WHERE (course_duration IN ('" . $personid . "')) 
        OR (course_duration IN ('" . $personid2. "')) 
        LIMIT 10";
    $result = mysqli_query($con,$sql);
    $sqlCount = "
        SELECT * FROM courses 
        WHERE (course_duration IN ('" . $personid . "')) 
        OR (course_subc1 IN ('" . $personid2. "')) 
        OR (course_subc3 IN ('" . $personid2. "')) 
        OR (course_subc1 IN ('" . $personid2. "')) 
        OR (course_subc4 IN ('" . $personid2. "')) 
        OR (course_subc5 IN ('" . $personid2. "'))";
    $get_crs_count = mysqli_query($con, $sqlCount);
    $count_rows = mysqli_num_rows($get_crs_count);
    //I use multiple lines for php html strings too 
    //so I don't get confused
    //Keep up using single quotes for html strings, good habit!
    echo '
        <p style="margin-bottom: 8px;margin-top: 8px;font-size:18px;">
            <b>Number of courses available: </b>' . $count_rows . '
        </p>';
    while ($row_crs = mysqli_fetch_array($result))
    { 
        $crs_id = $row_crs['course_id'];
        $crs_cat = $row_crs['course_cat'];
        $crs_provider = $row_crs['course_provider'];
        $crs_title = $row_crs['course_title'];
        $crs_price = $row_crs['course_price'];
        $crs_city= $row_crs['course_city'];
        $crs_category= $row_crs['course_cat1'];
        $crs_date= $row_crs['course_date1'];
        $crs_sdesc= $row_crs['course_sdesc'];
        $crs_shortdesc = mb_strimwidth("$crs_sdesc",0,140,"...");
        $crs_image = $row_crs['course_image'];
        $provider_image = $row_crs['provider_image'];
        //Being nit-picky, but you said you were novice so thought I'd help
        //<center></center> isn't used much anymore, use CSS to align
        // 'src="$variable"' works, but src="' . $variable . '" is much more reliable, and it's best to be consistent
        //Don't use <i></i> tags either, use <span>
        //Use CSS font-weight:bold; instead of <b></b> tags
        //Try to avoid inline-styling ( style="color:white;" )
        //Sometimes inline-styling is necessary, but use classes/ids if possible
        echo '
            <article class="search-result row">
                <center>
                    <div class="col-xs-12 col-sm-12 col-md-3" id="thumbnailContainer">
                        <a href="#" title="Lorem ipsum" class="thumbnail" id="resultThumbnail">
                            <img src="' . $provider_image . '" />
                        </a>
                        <a href="searchPage.php?crs_price=' . $crs_price . '" style="color:black;">  
                            <button id="resultprice">
                                <span id="resultpriceText">$ ' . $crs_price . '</span>
                            </button>
                        </a>
                    </div>
                    <div class="col-xs-12 col-sm-12 col-md-2">
                        <ul class="meta-search" id="listDesign">
                          <a href="searchPage.php?crs_date=' . $crs_date . '" style="color:white;">
                              <li>
                                  <button id="resultInfo">
                                      <i class="fa fa-calendar fa-1x">
                                          <span id="iconText">  $crs_date</span>
                                      </i>
                                  </button>
                              </li>
                          </a>
                          <a href="searchPage.php?crs_category=' . $crs_category . '" style="color:white;">
                              <li>
                                  <button id="resultInfo2">
                                      <i class="fa fa fa-tags fa-1x">
                                          <span id="iconText"> $crs_category</span>
                                      </i>
                                  </button>
                              </li>
                          </a>
                          <a href="searchPage.php?crs_provider=' . $crs_provider . '" style="color:white;">
                              <li>
                                  <button id="resultInfo">
                                      <i class="fa fa-graduation-cap fa-1x">
                                          <span id="iconText">  $crs_provider</span>
                                      </i>
                                  </button>
                              </li>
                          </a>
                          <a href="searchPage.php?city=' . $crs_city . '" style="color:white;">
                              <li>
                                  <button id="resultInfo">
                                      <i class="fa fa-map-marker fa-1x">
                                          <span id="iconText"> $crs_city</span>
                                      </i>
                                  </button>
                              </li>
                          </a>
                      </ul>
                  </div>
              </center>
              <div class="col-xs-12 col-sm-12 col-md-7 excerpet">
              <h3 id="resultHeading">
                  <a href="coursePage.php?crs_id=' . $crs_id . '" id="headingLinking">
                      <b>' . $crs_title . '</b>
                  </a>
              </h3>
              <div id="courseshortDescription">' . $crs_shortdesc . '
                  <center>
                      <a href="coursePage.php?crs_id=' . $crs_id . '" style="color:white;">
                          <button class="btn btn-danger" id="findoutBtn">Find Out More</button>
                      </a>
                  </center>
              </div>
          </div>
          <span class="clearfix borda"></span>
      </article>';
    }
    mysqli_close($con);

让我知道这一切是否合理。很抱歉在评论中含糊其辞。不知道你的知识水平，我在工作，哈哈。