PHP method to save base64 format images to a specified directory

<?php
header(&#39;Content-type:text/html;charset=utf-8&#39;);
$base64_image_content = $_POST[&#39;imgBase64&#39;];
//匹配出图片的格式
if (preg_match(&#39;/^(data:\s*image\/(\w+);base64,)/&#39;, $base64_image_content, $result)){
$type = $result[2];
$new_file = "upload/active/img/".date(&#39;Ymd&#39;,time())."/";
if(!file_exists($new_file))
{
//检查是否有该文件夹，如果没有就创建，并给予最高权限
mkdir($new_file, 0700);
}
$new_file = $new_file.time().".{$type}";
if (file_put_contents($new_file, base64_decode(str_replace($result[1], &#39;&#39;, $base64_image_content)))){
echo &#39;新文件保存成功：&#39;, $new_file;
}else{
echo &#39;新文件保存失败&#39;;
}
}
?>