How to check if a string is base64 valid in PHP

Question

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

Answer 1

This code should work, as the decode function returns FALSE if the string is not valid:

if (base64_decode($mystring, true)) {
    // is valid
} else {
    // not valid
}

You can read more about the base64_decode function in the documentation.