PHP:
<?php
//incluimos nuestra conexion
include_once("../Modelo/conexion_login.php");
try {
//creamos nuestra conexion
$dbConn = new PDO('mysqli:host=localhost; login_tm', 'root', '1998');
$dbConn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // creamos el try catch para que nos diga lo que sucede con la conexion
$busqueda=$_GET["Buscar"];
require ("../Modelo/conexion_login.php");
$dbConn->exec("set_character set utf8");
$sql="SELECT * FROM USUARIOS WHERE CORREO LIKE '%$busqueda'";
$result=$dbConn->prepare($sql);
$result->execute(array("$busqueda"));
?>
HTML:
<html>
<head>
<title>Ver Usuarios Registrados</title>
<link rel="icon" type="/image/png" href="../../Login/img/tm.ico"/>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">
<style>
.borde{
background-color: yellow;
text-align: left;
}
.borde2{
background-color: #0F8886;
height: 80px;
top: 620px;
}
.borde3{
right: 24px;
}
</style>
</head>
<body>
<nav class="navbar navbar-expand-sm bg-info navbar-dark"><!--navbar-expand-lg,md,fixed-bottom-->
<a href="#" class="navbar-brand"><img src="ets2_00005.png" style="width: 30px;"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#uno">
<span class="navbar-toggler-icon"></span></button>
<div class="collapse navbar-collapse" id="uno"><!-- flex-center, flex-column nav-pills -->
<ul class="navbar-nav">
<h1>Administracion de usuarios</h1>
<li class="nav-item"><a href="../Vista/panel_de_control.php" class="nav-link">Volver al incio</a></li>
<li class="nav-item"><a href="#" class="nav-link">Link 2</a></li>
<li class="nav-item"><a href="#" class="nav-link">Link 3</a></li>
<li class="nav-item"><a href="#" class="nav-link">Link 4</a></li>
<li class="nav-item dropdown"><a href="#" class="nav-link dropdown-toggle" data-toggle="dropdown" id="navbardrop">Link5</a>
<div class="dropdown-menu">
<a href="#" class="dropdown-item">Sub item 1</a>
<a href="#" class="dropdown-item">Sub item 2</a>
<a href="#" class="dropdown-item">Sub item 3</a>
<a href="#" class="dropdown-item">Sub item 4</a>
</div>
</li>
<form action="busqueda.php" method="get" class="form-inline">
<button class="btn-success" type="Submit" name="Buscar">Buscar</button>
</form>
</ul>
</div>
</nav>
<br></br><br></br>
<div class="container">
<table class="table table-dark table-hover" width='80%' border=0>
<tr bgcolor='#CCCCCC'>
<td>Correo</td>
<td>Contraseña</td>
<td>Tipo Usuario</td>
<td>Editar Usuario</td>
<td>Eliminar Usuario</td>
</tr>
<?php
while($row = $result->fetch(PDO::FETCH_ASSOC)) {
echo "<tr>";
echo "<td>".$row['correo']."</td>";
echo "<td>".$row['contrasena']."</td>";
echo "<td>".$row['tipo_usuario']."</td>";
echo "<td><a href=\"../Controlador/editar_usuarios.php?id=$row[id]\">Editar</a</td>";
echo "<td><a href=\"../Controlador/eliminar_usuario.php?id=$row[id]\" onClick=\"return confirm('Are you sure you want to delete?')\">Eliminar</a></td>";
}
}catch(PDOException $e) {
die('Error ' . $e->getMessage());
}finally{
$dbConn=null;
}
?>
</table>
</div>
<div class="borde3">
</div>
<div>
<h1 class="col-12 borde2 fixed-bottom display-4"></h1>
</div>
</body>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js" integrity="sha384-smHYKdLADwkXOn1EmN1qk/HfnUcbVRZyYmZ4qpPea6sjB/pTJ0euyQp0Mk8ck+5T" crossorigin="anonymous"></script>
</html>