css - Difference between base_url scenarios -


i bit confuse difference between 2 url scenarios 

$config['base_url'] = ''; $config['base_url'] = 'localhost/blabla';  <link rel="stylesheet" type="text/css" href="<?php echo base_url(). 'css/style.css'; ?>" />

if set base_url() on first given site apply css if set second given example css not apply , browser logs not found(404) has same generated url 

localhost/blabla/css/style.css

why? reading documentation in elislab website cant figure out. input guys..

 $config['base_url'] = '';  $config['base_url'] = 'localhost/blabla';

try this, should work both above:

<?php     $this->load->helper('url'); ?> <link rel="stylesheet" type="text/css" href="<?php echo base_url()?>/css/style.css" />

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