PTCT_EN(data): Takes some text and encodes it into Base64 (like turning it into a scrambled message). PTCT_DE(encoded_data): Takes the scrambled message and turns it back into the original text.

Web APIとの連携や、フロントエンドから送られてくるデータを処理していると、一見すると無意味な英数字の羅列に遭遇することがあります。「iVBORw0KGgo...」のように延々と続く長い文字列。これこそが、画像やPDFなどのバイナリデータをテキスト形式で表現 ...

When working with Web APIs or processing data sent from the frontend, you may encounter what looks like a meaningless string of alphanumeric characters. A long string that continues on and on, like ...

First the data is converted into a binary string, divided into 6 bit chunks and stored. Each 6 bit chunk can be mapped to one of 64 possible values which are ASCII characters based on the base64 table ...