index.php

<!doctype html>
 <html lang="en">
 <head>
 <meta charset="utf-8">
 <title>PHP ve Ajax İle Canlı Arama Uygulaması</title>
 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
 <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">
 </head>
 <body>
 <div class="container" style="margin-top: 50px;">
 <h2 style="text-align: center;"><b>PHP, MySQL ve Ajax İle Canlı Arama Uygulaması</b></h2><br>
 <div class="row">
 <div class="col-md-2"></div>
 <div class="col-md-8 form-group">
 <input type="text" id="search" class="form-control" autocomplete="off" placeholder="Aramak istediğiniz kelimeyi giriniz."><br>
 </div>
 <div class="col-md-2"></div>
 </div>
 <div class="result">
 </div>
 </div>
 </body>
 </html>
 <script
  src="https://code.jquery.com/jquery-3.6.0.min.js"
  integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4="
  crossorigin="anonymous"></script>
 <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.min.js" integrity="sha384-+YQ4JLhjyBLPDQt//I+STsc9iw4uQqACwlvpslubQzn4u2UU2UFM80nGisd026JF" crossorigin="anonymous"></script>
 <!---jQuery ajax live search --->
 <script type="text/javascript">
 $(document).ready(function(){         // veritabanına istek atma
 loadData(); function loadData(query){           $.ajax({             url : "post.php",             type: "POST",             chache :false,             data:{query:query},             success:function(response){               $(".result").html(response);             }           });           }         // gelen sonuçları listeleme
 $("#search").keyup(function(){           var search = $(this).val();           if (search !="") {             loadData(search);           }else{ loadData(); } }); });
 </script>



post.php


<?php
 $sunucu = "localhost"; $kullanici = "root"; $sifre = "";
 try {   $conn = new PDO("mysql:host=$sunucu;dbname=egitim", $kullanici, $sifre);   // Hata Yakalama
 $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch(PDOException $e) {   echo "Bağlantı Hatası: " . $e->getMessage(); }
 if($_POST){      try {          $ad_soyad = $_POST['query'];           $query = $conn->prepare('SELECT * FROM users WHERE ad_soyad LIKE ?');         $query->execute(array('%'.$ad_soyad.'%'));         while ($results = $query->fetch())         {             echo "<li>".$results['ad_soyad']."</li>";         }     } catch (PDOException $e) {          die($e->getMessage()); } }
 ?>


Araştırma yaparken buldum .Kod sorunsuz çalışıyor belki ihtiyacı olan vardır diye paylaşmak istedim

kAYNAK :https://kodlamaklazim.com/blog/php-mysql-ajax-ve-jquery-kullanarak-canli-arama-yapmak