Decimal to binary

PHP implements decimal conversion to binary
                 
                                                                                                                                                                                                                                                                                                                     

 array_push($flag,$dec%2);
 $dec = (int)$dec /2;
 }
 $binstr = '';
 while (!empty($flag)) {
   $binstr .= array_pop($flag);
 }
 return $binstr;
}


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