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

You can use this function:

 function is_base64($s)
{
      return (bool) preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $s);
}