Problem with php saving Base64 image base64_decode

PHP has very good support for Base64, with built-in base64_encode and base64_decode responsible for Base64 encoding and decoding of images.

In terms of encoding, just read the image stream and then use base64_encode to encode it.

The decoding is a little more troublesome. The reason is that after encoding the image into a base64 string, these characters data:image/png;base64 will be added to the encoding, which is originally used for base64 recognition. However, if you put it directly into PHP and use the base64_decode function to decode it, the final saved image file format will be damaged. The solution is to remove this string of characters first:

$base64_string= explode(',', $base64_string); //截取data:image/png;base64, 这个逗号后的字符
$data= base64_decode($base64_string[1]);　　//对截取后的字符使用base64_decode进行解码
file_put_contents($url, $data); //写入文件并保存

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