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);

// $image_info = '/9j/4AAQSkZJRgABAQAASABIAAD......';

$base64_image_content = "data:{$image_info['mime']};base64," . chunk_split(base64_encode(file_get_contents($image_file)));

// $base64_image_content = 'data:image/jpg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD......';

//保存base64字符串为图片

//匹配出图片的格式

// $base64_image_content = 'data:image/jpg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD......';

if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){

$type = $result[2];

$new_file = "./test.{$type}";

// base64_decode('/9j/4AAQSkZJRgABAQAASABIAAD......');

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;

}

}

?>