图像大小调整不起作用（使用 base64）答案

【问题标题】：Image resizing not working (using base64)图像大小调整不起作用（使用 base64）
【发布时间】：2014-04-28 20:59:00
【问题描述】：

以下代码应该在字符串中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:)

<?php
// The file
$filename = 'tick.png';

// Set a maximum height and width
$width = 200;
$height = 200;

// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);

$ratio_orig = $width_orig/$height_orig;

if ($width/$height > $ratio_orig) {
   $width = $height*$ratio_orig;
} else {
   $height = $width/$ratio_orig;
}

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefrompng($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

$newImage = imagepng($image_p, null, 100); // got in has to be from 0 to 9
echo base64_encode(file_get_contents($newImage)); // this still does not work°
?>

【问题讨论】：

标签： php string image converter

【解决方案1】：

压缩级别不能为 100。只能从 0 到 9。

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

您可以使用 Base64 编码：

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

【讨论】：

echo base64_encode(file_get_contents($newImage));不工作

【解决方案2】：

这就是我的做法：

      $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);

【讨论】：