PHP将图片流存为图片文件

//网签生成图片
if (empty($data[‘signature‘])) {
return $result = [‘code‘ => 0, ‘msg‘ => ‘请签名后再提交！‘];
}
//将图片流写入图片文件
$file_path = ROOT_PATH.‘public_html/uploads/signature‘;
if (!file_exists($file_path)){
mkdir($file_path);
}
$file_name = $this->c_user_id.‘.png‘;
$file = $file_path . ‘/‘ . $file_name;
if (file_exists($file)) {
unlink($file);
}
$image = file_get_contents ( $data[‘signature‘]);
if (@$fp = fopen ( $file, ‘w+‘ )) {
fwrite ( $fp, $image );
fclose ( $fp );
}