如何检查字符串在PHP中是否为base64有效 [英] How to check if a string is base64 valid in PHP

问题描述

我有一个字符串，想使用PHP测试是否为有效的base64编码.

I have a string and want to test using PHP if it's a valid base64 encoded or not.

推荐答案

我意识到这是一个老话题，但是使用strict参数不一定会有所帮助.

I realise that this is an old topic, but using the strict parameter isn't necessarily going to help.

在诸如我不是base 64编码的"之类的字符串上运行base64_decode不会返回false.

Running base64_decode on a string such as "I am not base 64 encoded" will not return false.

但是，如果您尝试使用strict解码字符串，然后使用base64_encode重新编码，则可以将结果与原始数据进行比较，以确定它是否是有效的bas64编码值:

If however you try decoding the string with strict and re-encode it with base64_encode, you can compare the result with the original data to determine if it's a valid bas64 encoded value:

if ( base64_encode(base64_decode($data, true)) === $data){
    echo '$data is valid';
} else {
    echo '$data is NOT valid';
}

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