How to display binary integer value in PHP

Question

How to echo a binary integer value in PHP? I tried using pack('S',$var) but didn't show any results ...

Answer 1

 decbin($number); 

Returns a string containing the binary representation of the argument of the given number.

For example, decbin(26) will return 11010

Source documents for decbin ()

Answer 2

 <?php echo base_convert($number, 10, 2); ?> 

http://php.net/manual/en/function.base-convert.php

string base_convert ( string $number , int $frombase , int $tobase )