url safe encoding

URL-safe string encoding:

  1. function urlsafe_b64encode($string){ 
  2.    $data = base64_encode($string);
  3.    $data = str_replace(array('+','/','='),array('-','_',''),$data);
  4.    return $data;
  5. }
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URL-safe string decoding:

  1. function urlsafe_b64decode($string){ 
  2.    $data = str_replace(array('-','_'),array('+','/'),$string);
  3.    $mod4 = strlen($data)%4;  
  4.    if($mod4){  
  5.        $data .= substr('====', $mod4);
  6.    }
  7.    return base64_decode($data);
  8. }

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