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What I write is a filtering function. I use ajax to request information from the database in php, and use JSON to pass it back to javascript. However, when entering relevant content, some filters can be read from the database, and some cannot. , I want to ask how to solve it.

javascript code:

submitElement.addEventListener('click',function(event){
     if(searchDescription === 1){
         search = filterByTitleElement.value;
     }else if(searchDescription === 2){
         search = filterByDescriptionElement.value;
     }

     //將輸入的搜索信息傳遞給php文件，讓其再數(shù)據(jù)庫中找到相應(yīng)的匹配項(xiàng)。

         var xmlhttp;
         if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
             xmlhttp = new XMLHttpRequest();
         }
         else {// code for IE6, IE5
             xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         }
         xmlhttp.onreadystatechange = function () {
             if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                 a = eval('(' + xmlhttp.responseText + ')');
                                  tableDisplay.innerHTML = a.length;
                 }
             }
         };
         xmlhttp.open("GET", "SearchDeal.php?inputMessage=" + search + "&searchdescription=" + searchDescription, true);
         xmlhttp.send();
 });

 function pageForDisplay(number){
     var result = "<thead><tr><td>Search Result</td></tr></thead><tr><td><table border=\"1\" id=\"inside\">";
     for(var i = 0; i < 5 ;i++){
         result = result + " <tr><td><p class=\"photoInside\"><a href=\"DetailsPage.php\"><img src=\"travel-images/square-medium/" + a[number + i]['PATH'] +"\"></a>" +
             "<h3><a href=\"DetailsPage.php\">" + a[number + i]['Title'] +"</a></h3>" +
             "<p>" + a[number + i]['Description'] + "</p>" +
             "</p></td></tr>";
     }
      result = result + "</table></td></tr>";
     return result;

php code:

     $messageForSearch = $_GET["inputMessage"];
$messageForNumber = $_GET["searchdescription"];
$conn = mysqli_connect("localhost","root","","travel");
if($messageForNumber == 1){
    $sql = "SELECT ImageID,Title,Description ,PATH FROM travelimage where Title REGEXP '[$messageForSearch]'";
}else if($messageForNumber == 2){
   $sql = "SELECT ImageID,Title,Description ,PATH FROM travelimage where Description REGEXP '[$messageForSearch]'";
}
$a = mysqli_query($conn,$sql);
$json = mysqli_fetch_all($a,MYSQLI_ASSOC);
//print_r($json);
echo json_encode($json);
}

According to the above code, sometimes a.length will change, but sometimes it will not change (usually when there are too many filtered results). However, if I replace the last line of code in php with print_r($json), there will be output.