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我找到了解决问题的方法,我使用base64_encode($blob);函数
<?php
// Server credentials 
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "unirentas";

// Creating mysql connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Checking mysql connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}

// Writing a mysql query to retrieve data 
$sql = "SELECT ID_renta, calle, smz, mz, lote, precio, universidad, fecha, imagen, nombre, telefono, correo FROM propiedades";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
  // Show each data returned by mysql
  while($row = $result->fetch_assoc()) {
      $ID_renta = $row["ID_renta"];
      $calle = $row["calle"];
      $smz = $row["smz"];
      $mz = $row["mz"];
      $lote = $row["lote"];
      $precio = $row["precio"];
      $universidad = $row["universidad"];
      $fecha = $row["fecha"];
      $blob = $row["imagen"];
      $nombre = $row["nombre"];
      $telefono = $row["telefono"];
      $correo = $row["correo"];


echo "

    <!-- USING HTML HERE : -->

    <p> ID : $ID_renta</p>
    <p> Calle : $calle </p>
    <p> Smz : $smz </p>
    <p> Mz : $mz </p>
    <p> Lote : $lote </p>
    <p> Precio :  $precio </p>
    <p> Universidad : $universidad </p>";
    echo '<img src="data:image/png;base64,'.base64_encode($blob).'"/>';
    echo "<p> Fecha_  $fecha  </p>
    <p> Nombre :  $nombre  </p>
    <p> Telefono :  $telefono </p>
    <p> Correo :  $correo  </p>
    <p>////////////////////////////////////////////////////////////////////////////////</p>

";
  }
} else {
  echo "0 results";
}

// Closing mysql connection
$conn->close();
?>