codeigniter - Adding a space to strings with underscrore in php -


i trying add underscore space in string using str_replace() in php not doing expect doing:

     echo $view="one bank".'<br>';      echo $view_name=  str_replace("","_",$view);  output:      1 bank     1 bank  wanted:      1 bank     one_bank

change "" " " , work


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