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

if u are doing api calls using js for image/file upload to the back end this might help

function is_base64_string($string)  //check base 64 encode 
{
  // Check if there is no invalid character in string
  if (!preg_match('/^(?:[data]{4}:(text|image|application)\/[a-z]*)/', $string)){
    return false;
  }else{
    return true;
  }

}