Php 图像大小调整不起作用（使用base64）

下面的代码应该以字符串形式输出调整大小的图像。不幸的是，它只输出MQ==那么我的错误在哪里？非常感谢您的帮助：）

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压缩级别不能为100。只有从0到9

imagepng($image_p, null, from 0 to 9);

Base64编码您可以使用：

ob_start();
imagepng($image_p, null, 9); // got in has to be from 0 to 9
$stream = ob_get_clean();
echo base64_encode($stream);

我就是这样做的：

      $Temp_Dump = $_FILES["file"]["tmp_name"];
      // Get new sizes
      list($width, $height) = getimagesize($Temp_Dump);
      $newwidth = 90;
      $newheight = 90;

      // Load
      $Temp_thumb = imagecreatetruecolor($newwidth, $newheight);
      //$source = imagecreatefromjpeg($Temp_Dump);

      if($extension == "jpg" OR $extension=='jpeg'){ 
      $source = ImageCreateFromJpeg($Temp_Dump); 
      }elseif ($extension == "gif"){ 
      $source = ImageCreateFromGIF($Temp_Dump); 
      }elseif ($extension == 'png'){
       $source = imageCreateFromPNG($Temp_Dump);
      }

      // Resize
      imagecopyresized($Temp_thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

echo base64_编码（文件获取内容（$newImage））；不起作用

      $Temp_Dump = $_FILES["file"]["tmp_name"];
      // Get new sizes
      list($width, $height) = getimagesize($Temp_Dump);
      $newwidth = 90;
      $newheight = 90;

      // Load
      $Temp_thumb = imagecreatetruecolor($newwidth, $newheight);
      //$source = imagecreatefromjpeg($Temp_Dump);

      if($extension == "jpg" OR $extension=='jpeg'){ 
      $source = ImageCreateFromJpeg($Temp_Dump); 
      }elseif ($extension == "gif"){ 
      $source = ImageCreateFromGIF($Temp_Dump); 
      }elseif ($extension == 'png'){
       $source = imageCreateFromPNG($Temp_Dump);
      }

      // Resize
      imagecopyresized($Temp_thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);