php - 调整图像大小和图像格式

Question

下面是我的 php 代码，我用它在 mysql 数据库中检索 3 个 blob 类型的图像!

虽然我成功地检索了它们，但我不明白如何嵌入html代码来控制检索到的图像的高度和宽度!

在这里我还可以检索 png 类型的图像。

请帮我根据我上传到数据库的图像格式检索任何格式(例如jpeg)的图像(我已经获取了上传图像的类型。(例如-$images1= getimagesize($_FILES['Image1']['tmp_name']); $imagetype1=$images1['mime'];).

所以我需要 2 个主要帮助:

1. 调整从上述 php 代码检索到的图像的宽度和高度

2. 以格式检索图像

   <?php
           require("includes/db.php");
   
           $sql="SELECT * FROM `order` ";
           $result=mysqli_query($db,$sql);
   
   echo "<table>";
   
   
   while($row=mysqli_fetch_array($result))
   {
   
   echo"<tr>";
    echo"<td>";
   echo $row["OrderNo."];
    echo "<br>";
    echo"</td>";
    echo"<td>";
   echo $row["NIC"];
    echo "<br>";
    echo"</td>";
    echo"<td>";
   echo $row["DP"];
    echo "<br>";
    echo"</td>";
    echo"<td>";
   echo $row["Address"];
    echo "<br>";
    echo"</td>";
    echo"<td>";
   echo $row["DPTime"];
    echo "<br>";
    echo"</td>";
    echo"<td>";
   echo $row["Telephone"];
    echo "<br>";
    echo"</td>";
    echo"<td>";
   echo $row["Email"];
    echo "<br>";
    echo"</td>";
   echo"<td >";
   echo '<img src="data:image/png;base64,'.base64_encode( $row['Image1'] ).' " />';
   
   echo "<br>";
    echo"</td>";
   echo"<td >";
   echo '<img src="data:image/png;base64,'.base64_encode( $row['Image2'] ).' "/>';
   
   echo "<br>";
    echo"</td>";
     echo"<td >";
    echo '<img src="data:image/png;base64,'.base64_encode( $row['Image3'] ).' "/>';
   
   echo "<br>";
    echo"</td>";
   
    echo"</tr>";
   
   }
   echo "</table>";
   
   ?>
   

Answer 1

  <?php

// This is the temporary file created by PHP
$uploadedfile ="search.png";

// Create an Image from it so we can do the resize
 $info = getimagesize($uploadedfile);
if ($info['mime'] == 'image/jpeg') 
        $src = imagecreatefromjpeg($uploadedfile);

    elseif ($info['mime'] == 'image/gif') 
        $src = imagecreatefromgif($uploadedfile);

    elseif ($info['mime'] == 'image/png') 
        $src = imagecreatefrompng($uploadedfile);
//$src = imagecreatefromjpeg($uploadedfile);


list($width,$height)=getimagesize($uploadedfile);

$newwidth=80;
$newheight=($height/$width)*80;
$tmp=imagecreatetruecolor($newwidth,$newheight);


imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);


$filename =$uploadedfile;
imagejpeg($tmp,$filename,100);

imagedestroy($src);
imagedestroy($tmp);











?>  

这会调整图像大小。