php读取和保存base64编码的图片内容

 <?php
 header('Content-type:text/html;charset=utf-8');
 //读取图片文件，转换成base64编码格式
 $image_file = './4296762_165319032930_2.jpg';
 $image_info = getimagesize($image_file);
 $base64_image_content = "data:{$image_info['mime']};base64," . chunk_split(base64_encode(file_get_contents($image_file)));

 //保存base64字符串为图片
 //匹配出图片的格式
 if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){
   $type = $result[2];
   $new_file = "./test.{$type}";
   if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
     echo '新文件保存成功：', $new_file;
   }

 }
 ?>

 <img src="<?php echo $base64_image_content;?>" />