Can't get str_replace() to strip out spaces in a PHP string -


hi, getting php string need strip spaces out of. have used following code when echo $classname displays string still spaces in it. 

   <?php      $fieldname = the_sub_field('venue_title');      $classname = str_replace(' ', '', $fieldname);      echo $classname;    ?>

if know white space only due spaces, can use:

$classname = str_replace(' ','',$fieldname );

but if could due space, can use:

$classname = preg_replace('/\s+/','',$fieldname )

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