note 77073 deleted from function.base64-decode by cmb

Note Submitter: morgangalpin att gmail dotty com ---- I was having trouble with base64_decode returning false if the data to be decoded wasn't actually encoded. It turns out that it is a bug that exists in PHP version 5.1.2, which I'm using, but it has been fixed in CVS. The relevant bug is: http://bugs.php.net/bug.php?id=37244 "base64_decode violates RFC 3548". The fix may become available in 5.2.4 or 6 or whatever is coming next. Since I'm not able to upgrade PHP to the latest version, I needed a way to check if some data had actually been encoded before trying to decode it. Here is the function I've used; I hope it helps someone. <?php /** * Check a string of base64 encoded data to make sure it has actually * been encoded. * * @param $encodedString string Base64 encoded string to validate. * @return Boolean Returns true when the given string only contains * base64 characters; returns false if there is even one non-base64 character. */ function checkBase64Encoded($encodedString) { $length = strlen($encodedString); // Check every character. for ($i = 0; $i < $length; ++$i) { $c = $encodedString[$i]; if ( ($c < '0' || $c > '9') && ($c < 'a' || $c > 'z') && ($c < 'A' || $c > 'Z') && ($c != '+') && ($c != '/') && ($c != '=') ) { // Bad character found. return false; } } // Only good characters found. return true; } ?>