Check if string is base64 php

Php detect base64 encoding

function is_base64_encoded($data)
{
    if (preg_match('%^[a-zA-Z0-9/+]*={0,2}$%', $data)) {
       return TRUE;
    } else {
       return FALSE;
    }
};

is_base64_encoded("iash21iawhdj98UH3"); // true
is_base64_encoded("#iu3498r"); // false
is_base64_encoded("asiudfh9w=8uihf"); // false
is_base64_encoded("a398UIhnj43f/1!+sadfh3w84hduihhjw=="); // false

Source: grepper.com

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